• > Sometimes requirements change – Top Line can save you time and money

    Sometimes requirements change and it becomes necessary to replace an existing TOP-FLO® manual process valve with an automated on/off or control valve. But, before you pull the old valve out of service and replace it with a new valve, you may want to consider automating your existing valve. If your valve is in good condition you can save time and money by automating it.

    Safety First

    The preferred method is to remove the valve from the line and automate it in your maintenance shop but that is not always possible. If you choose to automate the existing valve in line, first and foremost, make sure the valve is not under pressure and you follow your plant’s lock-out/tag-out (LOTO) procedures before you work on the valve.

    What Valve Are You Working With

    To start, identify the size and model of your TOP-FLO® valve. This will determine which actuator options are available and the required parts to make the change.

    All of our TOP-FLO® Series Ball Valves are equipped with an ISO-5211 mounting pad which allows an actuator to be bolted to the top of the valve eliminating the need for a bracket. For mounting an actuator to TOP-FLO® Butterfly Valves using body bolts, bracket and coupler kits are available. When using body bolts to mount the actuator, make sure your bolts are long enough to engage the bracket and valve body.

    Selecting an Actuator

    • Determine what type actuator you require. Top Line can supply either electric or pneumatic actuators.
    • Determine the desired function of your actuator and Top Line will make sure the actuator is the proper size for your application.
    • Once you choose your actuator, consult with your Top Line rep and obtain the proper mounting kit or parts to adapt the actuator to your valve.
    • Before you install the actuator, make sure the valve position matches the actuator. In other words, if the actuator is a fail closed actuator, make sure that the valve is in the closed position. When you mount an actuator on a valve, leave the mounting bolts slightly loose and stroke your actuator a couple of times. This will ensure that the mounting bracket is aligned properly and is not binding. Torque the bolts to the proper tightness. Once you tighten the bolts, stroke the actuator fully open and fully closed a few more times to make sure nothing is binding and the valve opens and closes smoothly.
    • Finally, add any controls you need such as solenoids, limit switches, or positioners to the assembly. Attach it to your plant air and wiring and test one more time before returning the valve to service.

    Learn More About Top Line Actuators.

    Top Line’s application engineers are available to assist you.

    Contact Top Line today!

  • To Specify a Top Line 3-Way Valve – Essential Information Is Needed

    Three-way valves are used in a number of applications with a primary function of diverting flow in a line.  To specify any valve there are essential pieces of information that are required to ensure that the correct valve type and configuration are selected for the intended application.  To specify a 3-Way valve, there is a minimum of data (parameters) that must be identified, and others which are helpful in determining the best choice of valve for the application.

    The table below segregates the essential information required as well as additional information which should be provided if known.  For each parameter, a brief description is provided (What Column) and the reason the information is required (Why Column) is also provided.  Please utilize this resource when engaging with Top Line to source your 3-Way Ball Valves, and if you require assistance don’t hesitate to contact us!



    Parameter What  Why
    Process Fluid What is the product being pumped? (e.g. Milk, Water, Cleaning Solution, etc…) Essential to understand in order to specify the correct valve seal.
    Clean in Place (CIP) Y / N If Yes, need to understand what the cleaning solution is and or if steam is to be used for seal selection.
    Pressure At what pressure is the process occurring (psi) Valve pressure rating
    Temperature and Temperature Range At what temperature is the process occurring C or °F) Seal material selection and in conjunction with the process pressure could change valve selection and sealing material selection
    Line Size Size of process line mating with valve Ensure compatibility with valve connections
    End Connections Connection (Weld, Tri-Clamp, other, etc.) Ensure compatibility with valve connection configurations
    Sealing Material What is the desired seal material? Typical choices include PTFE, Modified PTFE, Reinforced PTFE, 50-50 SS-PTFE, HMWPE It is essential that the material used to seal the valve is compatible with the process fluid, as well as the temperature range over which the valve is operating.  If unclear, Top Line engineering can recommend a material, and in those instances the more that is known about the application the better.
    Valve Material What is the desired valve material? Typical choices include CF3M/316L, CF8/316, and WCB (Carbon Steel) The valve body material must be compatible with the existing process lines and suitable for the process temperature and pressure.
    Surface Finish What is the required surface finish? Certain industries have requirements for surface finish.  Specifying the industry helps Top Line ensure that the appropriate surface finish is selected.
    Surface Treatment Is Electropolishing required? Electropolishing will create a surface with increased luster, and more importantly, increased resistance to corrosion.


    Parameter What  Why
    Viscosity Ability of the fluid to resist a shear force. Actuator motor sizing
    Cv (desired) or

    Δ psig

    Flow Coefficient (expressed as the flow rate in gallons of 60°F water which will pass through a valve in one minute at 1psi ΔP.) The differential pressure across the valve can also be provided. The process system is comprised of the various components; valves, piping runs (of various sizes), elbows, T’s, Heat Exchangers, Filters, etc.  Each of these components contribute resistance to the flow of the process fluid in the system.  Valves are a significant contributor to the overall flow resistance and understanding the Cv for a valve is important to the system designer for either a new system or if the valve is replacing an existing component as it effects the over-all system resistance.
    Specific Gravity Specific Gravity or Weight/gallon (Specific Gravity is a dimensionless number) Specific Gravity is a ratio based on the density of the process fluid compared to water. Fluids with specific gravities significantly different from water may require additional consideration when selecting the valves.


    Actuation methods for a 3 Way Ball Valve are discussed below, and it is important to understand that the method of actuation for the valve must be considered as part of the valve selection effort.  Valves are mechanical devices which direct and control the flow of the process fluid, and to perform this function they must be paired with a method to actuate them. (Similar to a pump and motor combination.)  Just as a pump cannot perform its’ function without a prime mover such as a motor, a valve cannot perform its’ function without an actuator. The most common method of actuation is a lever or hand-wheel which is manually moved by the operator to align the valve to the desired position.  The method of actuation tends to be a secondary consideration, however depending on the available infrastructure at the process location, only certain types of actuators may be viable. (e.g. only DC control voltage is available for valve control.)

    Method & Configuration Considerations 
    Manual Lever / Pipe Handle or Gear Operator
    Pneumatic Rack & Pinion Material Preference – Stainless Steel or Aluminum
    – Spring Open / Air Close Normally Open
    – Air Open/ Spring Close Normally Closed
    – Air Open / Air Close Double Acting
    Electric (ONLY for ¼ Turn or 90°) applications 24VAC, 24VDC, 220VAC, 115VAC, 220VAC

    Area Rating (Wash-down or Explosion Proof)


    After specifying the correct valve and method of actuation, the last step in the process is to combine the information in order to have the valve and actuator configured correctly for the application.  Listed below are possible arrangements for the control state of the valve.  The diagrams determine how the valve will control the process and they should be used to communicate to Top Line how to set up the valve/actuator assembly based on the ball pattern, type of actuator, and designation code. (For example as shown below: L-BALL / Counter Clock Wise (CCW) TURN 90° ACTUATOR / A1)

    Learn More About TOP-FLO® 3-Way Ball Valves (3-A) 

  • > Sample Valves – Make The Right Choice!

    Tech Topic By Tom Nicola – Top Line Application Engineer – January 2019

    The TOP-FLO® SV2 Sample Valves are specifically designed for taking process samples in the following facilities:

    • Pharmaceutical
    • Biotech
    • Food
    • Beverage
    • Dairy
    • Breweries
    • Wineries

    Samples are taken to ensure quality, consistency, taste and sterility. Sampling is extremely important at all stages of production, as it allows for validation of raw ingredients to quality testing at each key processing stage.

    TOP-FLO® Sample Valves are designed with minimal dead-leg area within each style valve, keeping internal hold-up volume to a minimum for accurate samples every time.

    The most common is the SV2 Right Angle Concentric sample valve.  This style valve has the body located in the center of the inlet connection and the discharge at a 90° angle. Applications include sampling, venting or draining.

    The EV2 Right Angle Eccentric sample valve is designed for drainability on horizontal lines. This style valve has the body located off-center at the outside edge of the inlet connection and the discharge at a 90° angle. These valves are often used as a bleed valve on transfer panels.

    The IN2 In-Line model is a concentric sample valve. This style valve has the body located in the center of the inlet connection and the discharge is 180° straight through the valve. Applications for this valve are the same as the SV2 and are used where space is limited.

    Top Line’s application engineers are available to assist you.

    Contact Top Line today!

    Learn More About TOP-FLO® Sample Valves

  • > What Is NPSHr For Pumps?

    Tech Topic By Tim Gorrell – Top Line Application Engineer – November 2018

    NPSHr (Net Positive Suction Head Required) is the minimum pressure at the suction port of the pump to keep the pump from cavitating which will cause cavitation erosion, noisy slow operation, and damage to the pump. The NPSHr is a function of the pump and must be provided by the pump manufacturer.

    NPSHa (Net Positive Suction Head Available) at the suction port of the pump.

    NPSHa is a function of the system that must be calculated prior to ordering a pump to assure the selected pump will operate correctly.

    If the NPSHr is greater than the NPSHa, the liquid vaporizes. The vapor bubbles collapse (implode) as they encounter increased pressure when exiting from the impeller, leading to cavitation that sounds like marbles or grinding inside the pump.

    The NPSHr is unique to each pump depending on the pump design, pump size, RPM and operating conditions.

    The NPSHr is provided on the pump curve provided by Top Line.

    An example of NPSHr:

    Go to the pump page

  • > Diaphragm Valve Manual Bonnet Selection

    Tech Topic By Brad Gregg – Top Line Sales  Engineer – October 2018

    Top Line manual bonnet assemblies follow the same time-tested and field verified performance from the start of product line inception in 1997. The standard features that are found in Top Line bonnet assemblies are often upgrades with additional cost from other valve manufacturers.

    Standard features include:

    • Sanitary internals
    • FDA FKM O-ring sealed hand wheel and stem
    • Non-galling internal stem assembly
    • Stainless steel bonnet body with an electropolish exterior
    • Fully autoclaveable

    Depending on the process and end-user requirements, there’s probably a Top Line bonnet assembly that will meet your need.

    1. A) Standard Open/Close applications:

    If adjustability of either the compression or limiting of the open position of the diaphragm is not of concern, a non-adjustable type bonnet is the best and most economical option.

    #12 bonnet

    • Stainless steel base with PPS thermoplastic hand wheel (valve sizes ½” – 2”).
    • PPS thermoplastic is very chemical and temperature resistant thermoplastic and can easily withstand wash down, autoclave, and sterilizing chemical wipe down protocols.
    • The stainless steel base is electropolished for both increased chemical resistance and for aesthetic purposes.

    #60 bonnet

    • Stainless steel base with stainless steel hand wheel (valve sizes ½” – 2”).
    • The #60 bonnet assembly is essentially the same bonnet as the #12 bonnet, but with an electropolished hand wheel.
    • If diaphragm changes are regularly made after valve assembly installation, many times the PPS hand wheel can be broken due to the assembly being dropped.  The stainless steel hand wheel version is typically selected to prevent breakage and/or increased chemical resistance.

    #9 bonnet

    • Stainless steel base with stainless steel hand wheel (valve sizes 2-1/2” – 4”).
    • The #09 bonnet is Top Line’s standard bonnet assembly for valve sizes over 2” and incorporates the same features and benefits as the #60 bonnet.

    2) Open/Close with adjustable close stop:

    If the prevention of over-compression of the diaphragm during valve closure in order to prolong diaphragm life is required, a bonnet assembly with an adjustable close stop should be used.  The close stop limits the amount of force that can be conveyed to the diaphragm, which prevents cold flow of the center diaphragm bead and premature failure of the elastomer backing cushion.

    18A bonnet

    • Stainless steel base with PPS thermoplastic hand wheel (Compact valve sizes ¼” – ½”).
    • The #18A bonnet is Top Line’s standard bonnet for BioFlo II series compact/lab size valves and incorporates an ergonomically designed hand wheel.  The adjustable close stop can be set with a simple turn of a set screw within the bonnet assembly without any disassembly and preventing the possibility of loss of any small parts during bonnet adjustment.

    #10 bonnet

    • Stainless steel base with stainless steel hand wheel (valve sizes ½” – 2”).
    • The #10 bonnet has the same features as the #18A bonnet, but with a durable stainless steel hand wheel as standard.

    3) Open/Close with adjustable open stop:

    If the requirement of the process system is to have some of the complete valve assemblies to remain in the semi-open position but can still be fully closed, an adjustable open stop bonnet should be used.  The adjustable open stop allows the user to manually set the proper open position of the valve during line balancing.

    #15 bonnet

    • Stainless steel base with PPS thermoplastic hand wheel & gradient position indicator (valve sizes ½” – 2”).
    • Top Line’s #15 open stop bonnet assembly gives the user the flexibility to set the desired open position, lock it into place to allow the valve to be opened to the same position every time, and the ability to see relative valve position via the gradient indicator incorporated into the bonnet.

    Find out more

  • > The Other Check Valve

    Tech Topic By Tom Nicola – Top Line Application Engineer

    The TOP-FLO® 62-174R Air Blow Check Valves are designed to evacuate lines of product or CIP solution and for air agitation of product in tanks and other vessels. These valves help to protect pipelines against corrosion by drying process lines after they are cleaned and rinsed. Air drying of lines permits formation of the protective oxide film. Air agitation thoroughly mixes and blends product – improving product uniformity and quality.

    The Air Blow Check Valve can be used in any position, horizontal or vertical. They are easily installed on Ball check Valves or tanks by using a clamp, a gasket, and a mounting ferrule. No other fittings are required.


    • Fail Safe Operation – backflow of product or CIP solution prevented by simple air to open, spring to close operation.
    • Easy Assembly/Disassembly – connections permit quick disassembly and assembly for replacing filter media, cleaning or inspection. A quick couple or FNPT air connection.
    • EPDM stopper.
    • Clamp sizes 1-1/2” – 4″
    • All 316L body construction.
    • Remotely Controlled – can be remotely controlled by controlling the supply of air to the valve.
    • Rugged Construction – spherical plug assembly is bonded EPDM rubber.


    Capacity to 1600 CFH air volume.

    Find out more

  • > Why Is Controlled Sulfur So Important?

    Tech Topic By Brad Gregg – Top Line Sales  Engineer – June 2018

    Top Line Offers a complete line of ASME certified BPE fittings in both extended butt weld and hygienic clamp end types.

    All 316L extended butt weld ends conform to the controlled sulfur requirement within the ASME BPE standard of 0.005-0.017. The controlled sulfur content allows for superior orbital weld-ability to biopharm industry standard tubing. Minimum straight tangent length requirements of BPE butt weld fittings make it possible to use a variety of orbital weld head types and widths during installation.

    Ferrule connections on the hygienic clamp type fittings are machined to the exacting tolerances stated in Table DT-7-1 of the BPE standard to ensure proper fit-up to the mating gaskets and the variety of clamps used in the industry.

    Top Line BPE fittings are inspected in-house to ensure conformance of the stringent surface finish (Part SF), dimensional (Part DT), and documentation requirements (applicable sections of Part GR – 5.2).

    Top Line BPE fittings are individually capped, bagged, and include the MTR within the packaging for easy reference and traceability for welding and validation operations.

    Stocked internal surface finishes include:

    • 20Ra max. mechanical (BPE surface finish code SF1)
    • 15Ra max. + electropolish (BPE surface finish code SF4)
    • Other BPE surface finishes available upon request

    The Top Line team is always available to assist with your questions and provide guidance for your BPE applications. Contact us today.

    Find out more about Top Line BPE fittings. 

  • >These Are A Good Alternative To More Expensive Valves

    Tech Topic By Tom Preston – Top Line Application Engineer –

    Sanitary butterfly valves are a good alternative to more expensive valves for use with fluids that are not intended to be used on USDA dairy products.

    Due to the butterfly valves simple design, it’s easy to maintain with minimal parts involved during servicing. Sanitary butterfly valves are typically found in applications that have a low internal line pressure (less than 145 PSIG).

    They can be utilized as either shut-off or throttling valves depending on the controls or top works applied to the valve itself. Top Line offers three different types of sanitary butterfly valves to better service industry-specific applications.

    » TOP-FLO® Value 

    The value type butterfly valve is a low cost, 2-piece manual valve alternative, specifically for the micro or craft brewery industry and also for smaller wine production facilities. The multi-position thermoplastic/stainless steel trigger handle is well suited for both shut-off and manual throttling capability.

    » TOP-FLO® Standard 

    The standard type butterfly valve is an option-oriented, mid-range priced, 2-piece valve that is well suited for most fluid process applications. The key to the standard type valve is its ability to be customized with a full range of both manual handle and automation options.

    » TOP-FLO® Definox Premium

    The premium type butterfly valve is a heavy duty style valve that is available in both standard 2-piece and 3-piece “between flange” type. The 3-piece type allows for even greater ease during maintenance and is more forgiving with slight misalignment issues during installation. Multiple manual handle options allow the user to control the valve in several ways. The automated version comes standard with a heavy-duty canister style steel pneumatic actuator.

    TOP-FLO® Butterfly Valves       

    TOP-FLO® Value  TOP-FLO® Standard TOP-FLO® Premium 
  • > Why Is Top Line’s DG Seal A Great Option?

    Tech Topic By Tim Gorrell – Top Line Application Engineer –

    Top Line’s very own TOP-FLO® centrifugal pumps have seal variations available, depending on the specific application. The C-114 thru C-328 size pumps are available with the “DG” Seal option, which is comprised of a Silicon Carbide Stationary Seat versus Carbon Rotating Element and is standard with FKM elastomer. The DG seal is an external balanced sanitary seal with clamped insert. This combination will allow the pump to process small abrasive and/or sticky ingredients without damaging the back plate. The water cascade can also be added to prolong the life of the carbon seal when pumping abrasive and/or sticky ingredients.

    Additionally, the DG external seal has fewer parts in the product area than the internal seal. This feature makes the pump easier to clean for CIP (clean in place) installations. This continues to be an important feature for the food and beverage industry.

    The versatility of the DG seal allows it to perform with different particles. It can withstand more diverse applications than the standard D seal. This feature has been important to the craft brew industry and is particularly useful on the Top Line pump dollies.

    There are multiple stationary seal materials to choose from; self-sintered Silicone carbide, reaction bonded Silicone carbide and Tungsten Carbide are available to accommodate your specific application.

  • > Hygienic Valve Considerations For Compendial Water Systems

    Tech Topic By Brad Gregg – Top Line Applications Engineer – January 2018

    Typical system operating parameters:


    Temperature:       68º F – 185º F (20º C – 85º C)

    Pressure:             0-87 psig (0-6 bar)

    It’s important to know and understand that the process conditions within any hygienic system greatly influence the type of valve construction required to provide proper operation of the system for the control of bioburden. It is also important that the owner/end-user understand that the degree of contamination risk changes depending on valve type selected, how it is installed, and how the valve/system is sanitized.

    Valve sealing systems are clearly defined within ASME BPE by two designations:

    1) Sliding

    » Sliding seals are used within valves such as mix-proof, butterfly, and O-ring shaft sealed single seat stem valves. These can be considered high risk due to the possibility of contaminants being drawn into the fluid stream or can trap contaminants within the valve in the open or closed position.

    2) Non-Sliding

    » Non-sliding seals are used within diaphragm valves and single seat stem type valves that incorporate a diaphragm to provide a stem seal. These can be considered low risk due to no internal components other than the sealing membrane making contact with the process fluid. The non-sliding sealing systems also prevent the process fluid from being exposed to atmospheric contaminants.

    Commonly used valve seal polymers are FKM, EPDM, PTFE, and modified PTFE classes that are FDA conforming and have been certified to be USP Class VI by a third party testing lab.


    The valves should not incorporate any areas in which fluid becomes trapped within. This would not facilitate free draining when installed in the proper orientation. Following the manufacturer’s installation recommendation for any valve is important in order to achieve the optimum characteristics for the reduction of dead leg areas within the valve. The BPE standard also provided guidance to minimize hygienic union connection within a hygienic system and incorporate welded construction wherever possible.

    Typical Methods of Valve/System Sanitization:

    1) Thermal

    » Increase in fluid temperature through heat exchanger

    » SIP (Steam In Place)

    2) Chemical

    » Ozonation

    3) Light

    » UV unit

    Special Considerations:


    1) System Pressure

    » The operating pressure of the system should be taken into consideration if it is expected to operate above the typical system pressure of 87psig (6 bar) in order to ensure that the correct actuator is used, especially with a non-sliding seal type diaphragm valve.

    2) Seal Material Compatibility

    » Compatibility of seal materials should be evaluated if the use of SIP and/or ozonation will be introduced into the system as a method of sanitization. SIP elevated temperatures above the typical system temperature 185º F (85º C) and ozonation degrading seal materials can both have an adverse effect on valve performance.

    If there are conditions present within the system that fall outside of the typical operating parameters, the valve manufacturer should be consulted during the selection process (valve type & sealing materials) in order to prevent premature valve failure after installation.

    Valve Materials Of Construction:

    Valve bodies and other internal process contact components are typically made of 316/316L and equivalent materials (CF3M, CF8M, etc.) are the most commonly used due to their corrosion resistant properties. Other materials might be used, but these are the most common.

    The standard internal surface finish of process contact areas within hygienic valves is 20Ra mechanically polished (BPE code SF1), however, the surface finish to be used is dependent upon the requirements of the owner/user.

  • >These Valves Are Authorized To Display The 3-A Symbol

    Tech Topic By Tom Nicola – Top Line Applications Engineer – October 2017

    Whether you are stopping or diverting flow in your process system, the TOP-FLO® Definox Single Seat Valves offer a flexible and reliable solution.

    The DCX3 Shut-Off and DCX4 Divert Valves have a modular design that is assembled with clamp connections making for quick and easy maintenance.

    The spherical body design ensures:

    • Optimum fluid flow
    • Reduction in pressure losses and cleanability.
    • Extra-thick walls guarantee excellent resistance to expansion constraints.

    The DCX3 Shut-Off and DCX4 Divert Valves are pneumatically or manually operated. The pneumatic actuators are fully maintainable and easily transformed from the standard NC (Normally Closed) position to NO (Normally Open) or DA (Double Acting) positions.

    A one-piece plug assembly is equipped with a floating PFA seal. The PFA seal offers outstanding cleanability, a tight seal even at high temperatures and excellent chemical resistance.

    With the growing worldwide pressure for food safety and hygiene these valves are authorized to display the 3-A symbol and have passed the EHEDG tests for Hygienic Equipment Design.   

    Top Line’s Application Engineers are always available to assist you on flow control valves. 

  • > Which Actuator Do I Need?

    Tech Topic By Brad Gregg – Top Line Sales Engineer – September 2017

    When you need a complete valve and actuator assembly, many actuators are already matched to the valve you’re looking for as a pre-configured complete unit. To decide which one you need, there are a few questions you should ask.


    1) What kind of environment will the actuator/valve assembly be installed in? Wash down, hazardous, outside in the elements, exposure to elevated temperatures, etc.?

    Answers to these questions will help Top Line guide you through the material and feature selection of the actuator. For example, your customer wants to install automated valve assemblies in two different areas: 1) Wash down area in a food processing room and 2) In a utility corridor that doesn’t see a wash down requirement. For the assembly that will be in the wash down area, the actuator material itself should be reviewed and more often than not, stainless steel is the answer for its superior corrosion resistance to the wash down chemicals. For the assembly in the utility corridor, there’s no concern when it comes to corrosion resistance and the actuator won’t be subjected to the elements. In this case a standard epoxy coated or hard anodized aluminum actuator would suit the application.

    2) What kind of utility is available to operate the actuator – i.e. is there a compressed air supply available or is there only electric available?

    The pneumatic actuator to operate the valve is a relatively lower cost option as compared to the electric actuator, however if there’s no air supply available and the expense of installing a new air supply to the area is high, the electric actuator may be the better solution.

    » If an air supply is available – the information that Top Line will need to know to provide either a complete assembly or actuator only are: What is the air supply pressure available?, what type of actuator is required (spring return or double acting)?, and is the valve fail position opened or closed? All of this will assist Top Line in determining the proper size actuator for the valve it is to be installed on.

    » If only electric is available – what voltage is available to operate the actuator? Typical voltages are 115VAC, 24VDC, and 220VAC single phase. Others are available but these are the most common. Keep in mind that electric actuators operate much slower than pneumatic actuators. If fast operation is a requirement valve opening/closure, then you should consider a pneumatic actuator.

    Top Line can provide several different actuator options when it comes to valve operation depending on the valve it will operate:

    Ball Valves:  
    • Rack & Pinion TA Series & SS Series – spring return & double acting
    • WE Series Electric – power to open / power to close
    • 180 degree Type – double acting for 3-way valves
    Butterfly valves:  
    • Rack & Pinion TA Series & SS Series – spring return & double acting
    • WE Series Electric – power to open / power to close
    • Canister stainless vertical – spring return & double acting
    Diaphragm valves:  
    • Linear piston type: 50 Series (thermoplastic) & EZ Series (thermoplastic / SS hybrid)
    • Linear diaphragm type: MBF Series (cast iron epoxy coated)
    • –Fail close, Fail open, and Double Acting for all versions

    If it’s not a Top Line valve, can you provide the manufacturer and/or the model number of the valve you want to automate?

    This information will help Top Line research the specific valve you want to automate. Depending on the type of mounting characteristics of the valve itself – Engineering may or may not be able to match a Top Line actuator to your existing valve.

    Top Line’s Application Engineers are always available to assist you on which actuator you need.

    Learn More about Top Line’s Actuators

    TOP-FLO® Canister Actuators For Butterfly Valves

    TOP-FLO® TA Series Actuators

    TOP-FLO® Electric Actuators For Ball & Butterfly Valves

    TOP-FLO® SRS 50 Actuators For Diaphragm Valves

    TOP-FLO® SRS 20, 30, 40 Actuators For Diaphragm Valves

  • > Top Line is going BIG!!

    The TOP-FLO® 8″ T45MP disk type check valve is the first check valve of this size in the market to satisfy the requirements of clean and hygienic design.

    Some of the key features of the valve are: 

    • Easy to CIP exposed internal seals
    • Guide finger type disc to assist in positive closure
    • Center body clamp to allow for quick disassembly for internal seal maintenance.

     Other Features:

    • 20Ra internal surface finish  – meets ASME BPE (SF1) and exceeds 3-A requirements
    • Exposed internal body seals to satisfy USDA design parameters
    • Standard seal material: FDA & USP Class VI – FKM
    • Guide finger type disc only
    • Made in USA
    • 316L SS construction
    • Double bolt 316 SS center body clamp with hex nuts
    • Suitable for process and CIP operations


    • Internal surface finish upgrade to 15Ra with electropolish ASME BPE (SF4) 
    • Seal materials: EPDM, Silicone

      Temperature Ratings:

    • 30ºF to 225ºF

       Pressure Ratings:

    • 115 psig maximum

       Part Number:

    • 384580GFV-6

    Download the 8″ T45MP check valve drawing

    TOP-FLO® T45MP check valves are also available in sizes 1/2″ – 8″

  • > Let Top Line Help You Select The Right Pump For Your Application – Discussion with Tom Preston (Top Line Technical Product Specialist)

    When properly sizing a pump, we need to know:

    • Liquid Data

    ⇒ Product ⇒ Specific Gravity


    • Operating Conditions

    Capacity (GPM) Discharge Pressure (PSI) Head Pressure (TDH)
    Inlet Pressure (PSI) (Where NPSHₐ ≥ NPSHᵣ) Viscosity (cP) – Ambient Temperature, Process Temperature Solid Size & Content

    Horizontal and vertical runs are important factors when determining head. 
    Friction loss is critical to determining head pressure.  To properly size a pump, the size and type of all fittings, valves and equipment must be taken into consideration.

    • Suction Line

    • Discharge Line

    ⇒ Tubing Size_____________ ⇒ Tubing Size____________
    ⇒ Vertical Drop____________ ⇒ Vertical Rise____________
    ⇒ Total Elbows____________ ⇒ Horizontal Run__________
    ⇒ Total Tees______________ ⇒ Total Elbows____________
    ⇒ Total Valves_____________ ⇒ Total Tees______________
    ⇒ Total Valves_____________


    • Discharge Valve(s) and/or Equipment

    Butterfly_______ Ball_______ Disk Check_______Other_____________

    Top Line’s application engineers are available to assist you with diagnostic sizing.  A completed sizing sheet is paramount for correct pump selection.  There are many pump applications; determining which pump is appropriate for your needs is critical.    

    To ensure many years of successful processing, contact Top Line Process Equipment Company to help size your pump today.


  • > This Valve Is An Excellent Choice For Utility And Process Fluids – Discussion with Tom Preston (Top Line Technical Product Specialist)

    Top Line’s TOP-FLO® tank bottom ball valve is an excellent choice for utility and process fluids within the hygienic industries where complete CIP is not an absolute requirement. The tank bottom type ball valve is available in ½” through 6” sizes for both TF4 Series food grade and 77 Series pharmaceutical grade valves.

    Unlike many competitors that provide an investment cast weld flange, Top Line’s tank bottom weld flange is machined from solid round 316L stainless steel bar stock per the ASME SA-479 specification.  The use of the ASME SA-479 material is ideally suited to comply with the requirements within Section VIII, Division 1 of the ASME Boiler & Pressure Vessel Code when an ASME stamped tank is being manufactured.

    Standard and optional features:

    • Weld tank flange: 316L per ASME SA-479 with original mill test report (MTR)
    • Internal surface finish: 25Ra
    • Conical internal contour of the weld tank flange helps prevent pooling within the tank during drainage
    • “True Port” design which eliminates dead-leg conditions and keeps pressure drops to a minimum.
    • ISO5211 direct mount style pad
      • The direct mount system features a live loaded stem packing that virtually eliminates stem side loading which extends the seal life especially when the valve is automated.
    • Seat material
      • Cavity filled or non-cavity filled PTFE
      • Non-cavity filled 50% SS / 50% PTFE (STFE) for high temp applications (Optional)
    • Manual Operators
      • TF4 Series: ½” – 4” flat type, 6” pipe type
      • 77 Series: ½” – 2” flat type, 2 ½” – 4” pipe type
      • Gear operator with or without chain wheel (Optional)
    • Automation
      • Rack & pinion actuators – coated aluminum
      • Rack & pinion actuatore – stainless steel
      • Electric actuators –
        • Voltages: 24VAC, 24VDC, 120VAC, 220VAC
        • On/Off or Fail-Safe spring return
      • Declutchable gear overdrives in case of power or air pressure loss
  • > This Valve Is COP Only (Clean-Out-Of-Place) – Discussion with Tim Gorrell (Top Line Application Engineer)

    With minimal pressure drop Top Line’s 2 and 3-way sanitary plug valves are an excellent choice for low pressure low temperature dairy, beverage, and CIP lines.

    The valve is COP only (clean-out-of- place) and designed for 25 psig. at 100°F for use with non-hazardous products.

    The valve comes in 304 or 316L stainless steel with an option of two different plug styles – silicone rubber or stainless steel.

    Plug valves feature a tapered core assembly held in place with a wing nut and washer on the bottom. This allows for easy disassembly and cleaning while eliminating crevices which can lead to contamination. The valve and plug both have matching identification numbers on them so they don’t get mixed with other plug valves.

  • > What Is That Clicking Noise In My Pump? – Discussion with Tom Nicola ( Top Line Application Engineer)

    The TOP-FLO®  TF-C Series Pumps are designed for use in CIP installations. This feature offers effortless self-cleaning with no dismantling or takedown. The sanitizing of all product contact areas is automatic.

    Circumferentially spaced angular grooves are located on the impeller hub and on the impeller shaft above the seal O-ring. These grooves cause turbulence which flush the hub pocket and adjacent parts as the impeller hub and shaft rotate.

    The impeller is retained utilizing a floating pin design. The retainer pin and retainer pin thru-hole in the stub shaft are also self-cleaning. This is accomplished by stopping and starting (bumping) the motor a few times during the CIP cycle. During this operation the pin will make a clicking noise as it floats back and forth in the hole as the motor rotation slows down.

  • > These Top Line Versatile Pumps Are Excellent for Clean-in-Place Applications

    This Month’s Tech Topic written by Tim Zetts – Regional Sales Manager & Tom Nicola – Application Engineer

    Top Line Process Equipment Company has centrifugal pumps that are in demand! The brewery industry knows that these TOP-FLO® pumps have the right flow rates for the three to ten barrel brewhouses used in many popular craft breweries.

    Our pumps are in demand for the food, dairy, beverage, and other sanitary industries.

    TOP-FLO® pumps are easy to install, clean, and operate. These versatile pumps are excellent for water and product transfer and CIP (Clean-in-Place) applications. These pumps are designed to enable easy self-cleaning with no dismantling or tear down. Sanitizing of all product contact area is automatic.

    Key features include:

    • 316L material on all wetted parts and MTR traceability upon request.
    • 304 stainless steel adapters.
    • Low cost compared to our competition.
    • Full customer service including:
      • Pump selection, sizing program, and engineering support at no additional cost.
      • Seal specifications – help with selecting the right seal for your application.

    Our TOP-FLO® centrifugal pumps are 100% tested in our newly re-modeled pump facility to guarantee they will perform for your operation.

    Top Line can provide many related value added items such as:

    • Washdown and TEFC (Totally Enclosed Fan Cooled) electric motors.
    • Variable Frequency Drives (VFD)
    • Flow control valves, check valves, and air relief valves.
    • Universal pump carts and dollies.
  • > This Valve Will Evacuate The Air From Your System Without The Risk Of Product Loss – Discussion with Tim Gorrell ( Top Line Application Engineer)

    The Top Line TOP-FLO® TL60ARV air relief valve is a great way to evacuate the air from your system without the risk of product loss.

    The valve will not allow air to enter into the line or container under vacuum but will automatically let air escape when you’re introducing product. Some of the applications for this valve include, but are not limited to, mounting it on top of a pipe line at high points in the line where air may get trapped and cause air/vapor lock, on top of the suction line prior to a pump to aid in priming the pump, and even on top of a vessel to evacuate the air during the filling operation. Top Line’s TL60ARV air relief valve has a maximum pressure rating of 150 psi @ 275° F. The material of construction is 316L stainless steel body, polypropylene ball, FKM elastomers with 304 stainless steel clamps. The standard finish is 32Ra ID/OD. The valve base comes in 1-1/2”, 2”, and 2-1/2” tri-clamp.

    The valve must be mounted in the vertical position in order for it to work properly and the product density must be 1.0 or higher. If you’re designing a system and would like advice in the proper use or position for this valve, please contact us and we would be happy to help you.

  • > What is A Sanitary Ball Type Check Valve and How does it Work? Discussion with Brad Gregg ( Top Line Sales Engineer)

    Ball type check valves are one of the styles of check valves used for low viscosity fluid backflow prevention in a sanitary piping system. A variety of typical applications where a Top Line ball check valve would be found in a sanitary system are water, CIP, raw and finished milk, soft drink, and fruit juice. This style of valve depends on downstream fluid back pressure to seat the ball into the internal inlet area of the valve which prevents reverse flow when there is no inlet fluid or pressure.

    What is an advantage of using a ball type vs. a disc type check valve?

    Unlike a disc type check valve, the advantage of a ball type check valve is that the fluid flow path is unrestricted. When there is fluid flow, the ball is pushed into the enlarged “Y” portion of the body and out of the way of the fluid stream. This feature reduces the pressure drop created across the valve when the elevated flow rates (i.e. during a CIP cycle to create turbulent flow) are required.

    Why use a Top Line Sanitary ball check valve?

    • The valve carries the 3-A certification so it can be used in USDA inspected dairy applications.
    • The 2-piece body design allows for the elastomer seat to be easily replaced if damaged or worn.
    • FDA conforming FKM elastomer seat & seal to handle harsh CIP chemicals.
    •  The solid virgin PTFE ball eliminates the possibility of delamination of an elastomer ball covering as found in many competitor ball check valve designs
    • Traceability available for all 316L wetted components.
    • Readily available seal and full repair kits for regularly scheduled maintenance.
    • Standard size clamp end for air blow check valve installation.

    Click here for information on ball check valves

  • > What is the Benefit of Electropolishing with Top Line’s Technical Team

    Electropolishing is the greatest form of passivation on stainless steel. Electropolishing removes surface metal by attacking high points on the surface. This process makes the surface smoother while eliminating contaminants which results in a clean and sterile surface. Electropolishing is intended to reduce corrosion and extend the life of the product.

    Food and beverage process equipment, tubing and pipe, medical equipment, and heat exchangers are just a few of the products that benefit from electropolishing. The smoother surface finish derived from the electropolishing process will naturally reduce the collection of processed materials and contaminants on the product contact surfaces. The equipment will clean faster and more effectively using a smaller volume of cleaning products. It saves downtime expenses, cleaning materials, and disposal of cleaning products if environmentally controlled near your facility.

    After electropolishing, the appearance of the surface finish is a bright and smooth polish with a great light reflection showing clarity of the item. Although the better physical appearance is pleasant to view, the more important benefit is the corrosion resistance. Corrosion resistance is created by the passive layer created on the surface of the metal from the electropolishing process. Free iron is removed from the surface of the metal.

  • > Work has begun to To Revise 3-A Sanitary Standard to New General Requirements with Tom Nicola (3-A Work Group Member & Top Line Application Engineer)

    After a two year stand still, work has begun to convert existing 3-A equipment-specific standards to reference the new General Requirements criteria. Eventually, all current 3-A Sanitary Standards and Accepted Practices will be revised to the new format with the General Requirements listed as a normative reference.

    3-A SSI recently announced the release of “ANSI/3-A 00-00-2014, 3-A Sanitary Standards for General Requirements.” The new General Requirements Standards was approved by American National Standards Institute as an American National Standard on September 8, 2014. The General Requirements Standard is a valuable reference for the entire range of food and beverage industries, where many upgrades in hygienic equipment design are expected for the prevention of food-borne illness.

    The new standard covers the sanitary design, materials of construction, and fabrication techniques for dairy, food, and beverage equipment used to process, handle, and package consumable products where a high degree of sanitation is required.


  • > How to select a Top Line Sanitary Butterfly Valve discussion with Brad Gregg (BPE Committee Member & Top Line Sales Engineer)

    Sanitary butterfly valves are a good alternative to more expensive valves for use with fluids that are not intended to be used on USDA dairy products. Due to the butterfly valve’s simple design it’s easy to maintain with minimal parts involved during servicing. Sanitary butterfly valves are typically found in applications that have a low internal line pressure (less than 145 PSIG). They can be utilized as either shut-off or throttling valves depending on the controls or top works applied to the valve itself. Top Line offers three different types of sanitary butterfly valves to better service industry specific applications.

    TOP-FLO® Value

    The Value type butterfly valve is a low cost, 2-piece manual valve alternative, specifically for the micro or craft brewery industry and also for smaller wine production facilities. The multi-position thermoplastic/stainless steel trigger style handle is well suited for both shut-off and manual throttling capability.

    TOP-FLO® Standard

    The Standard type butterfly valve is an option oriented, mid-range priced, 2 piece valve that is well suited for most fluid process applications. The key to the standard type valve is its ability to be customizable with a full range of both manual handle and automation options.

    Premium – Definox

    The Premium type butterfly valve is a heavy duty style valve that is available in both standard 2-piece and 3-piece “between flange” type. The 3-piece type allows for even greater ease during maintenance, and is more forgiving with slight misalignment issued during installation. Multiple manual handle options allow the user to control the valve in several ways. The automated version comes standard with a heavy duty, long life, vertical stainless steel pneumatic actuator.

    When properly selecting a sanitary butterfly valve, several points should be considered.

    • What is the fluid? This will assist in determining the chemical resistance of the seal material required.
    • What is the fluid temperature and internal line pressure? Since sanitary butterfly valves have low seat holding pressure, this information will assist you in determining if a sanitary butterfly valve is the right option for your application.
    • What is the required operation of the valve – manual or automated? If the valve is manual, all three butterfly types may work for your application. If the valve is automated, your choice is limited to Standard and Premium types.
    • Is the on/off cycle frequency of the automated style valve high? Consideration should be made to select either the Standard type with rack & pinion actuator or the Premium type with heavy duty pneumatic actuator.

    Not sure which butterfly valve best suits your application?

    Our sales and technical staff can help!

    Contact us Today! Download the butterfly brochure

  • >Pump Seals in Brewery Process Applications – discussion with Jim McCormick (Applications and Technical Sales Engineer)

    The recent surge in growth of the Craft Brewing industry has brought about many new opportunities. It has also brought with it some challenges especially when speaking about the seal. Many of today’s brewers are batching at very high temperatures and an unwitting customer may overlook this and use Buna-N Rubber gaskets and O-Rings. Buna begins to break down at around 190 °F. At Top Line, we strongly recommend FKM elastomer materials.Another obstacle is the ingredients used in today’s beers and ales. Any type of abrasive elements like coffee, cocoa, spices and such can become trapped between the sealing surfaces and can compromise the carbon rotating element and the stationary surface in a very short time.When transferring wort to the fermenter, you may see an excessive amount of a gooey substance that looks a lot like caramel around the sealing area. This is likely to be sugars. When it cools and hardens, the white residue of crystalized sugars will then appear. Sugars are produced by the malt during the mash process and are an important by-product of brewing. When it cools, the sugar crystallizes and, in effect, glues the carbon rotating element to the stationary surface. When the pump is re started, the initial torque is going to break that binding loose and occasionally it cracks or breaks the carbon.This can be solved with the Water Cascade assembly. This option gives the user the ability to dribble a very low flow to the seal to cool it and lubricate it. In addition, it helps to clean the seal of sticky substances when the pump shuts down. These substances tend to cake, or crystalize when cooled down. Our C-Series Pumps are available with our “DG” Seal option, which is comprised of a Silicon Carbide Stationary Seat vs. Carbon Rotating Element and is standard with FKM elastomer. This combination will allow for higher temperatures and the ability to pump small abrasive and / or sticky ingredients. The Water Cascade and the “DG Seal options are only available on models TF-C114 through TF-C328. As with most sanitary centrifugal pumps, our pumps should never be allowed to run dry.Please note: Neither the Water Flush Assembly, nor the “DG” Seal are available on the model TF-C100 Pump.

    Pictures below show seal from brewery with sugar buildup, and water flush assembly.

  • >The Heart and Soul of Automated Flow Control Valves – discussion with Tom Nicola (Applications Engineer at Top Line)

    The heart and soul of the TOP-FLO® DCX3 and DCX4 Automated Flow Control Valves are the plug seal and O-ring seals. At Top Line, sanitary process equipment is our business. The components in our TOP-FLO®DCX Seat Valves are manufactured of FDA compliant compounds which are held to the highest standards for use in the production of food, beverage, pharmaceuticals, BioPharm and cosmetics.

    Our sales and technical staffs take the time and ask the right questions when selecting the optimum sanitary seals and O-rings for specific applications. First, we must have an understanding of the total process environment. It is important to consider the product or solution passing through the valve, its temperature and chemical composition. We must also learn what cleaning and sterilization processes are employed at the facility, and the physical properties and chemical resistance of the sanitizing solution. This knowledge assists us in selecting the correct elastomeric compound for a specific process, by cross checking all of the information with a chemical resistance chart. Click here for more information about elastomeric compounds.

    Overcoming Over-pressure Situations – discussion with Tom Nicola (Applications Engineer at Top Line)

    The TOP-FLO® DCX3 adjustable relief valve is an innovative solution for protecting piping and equipment from damage do to pump over-pressure situations and unexpected pressure spikes in the food, dairy, beverage, cosmetics, and pharmaceutical industries.The sanitary design allows the user to adjust the desired cracking pressure by turning the fine thread adjusting nut on top of the actuator with a standard wrench.These TOP-FLO® DCX3 adjustable relief valves are clean-in-place (CIP) without having to over pressurize the system to open the valve. Just supply air to the actuator to open.

  • > Overcoming Over-pressure Situations – discussion with Tom Nicola (Applications Engineer at Top Line)

    The TOP-FLO® DCX3 adjustable relief valve is an innovative solution for protecting piping and equipment from damage do to pump over-pressure situations and unexpected pressure spikes in the food, dairy, beverage, cosmetics, and pharmaceutical industries.

    The sanitary design allows the user to adjust the desired cracking pressure by turning the fine thread adjusting nut on top of the actuator with a standard wrench.

    These TOP-FLO® DCX3 adjustable relief valves are clean-in-place (CIP) without having to over pressurize the system to open the valve. Just supply air to the actuator to open.

  • > Instructions Specific To Correctly Positioning The Drive Collar on a TOP-FLO® C-Series Centrifugal Pump – discussion with Jim McCormick (Applications and Technical Engineer at Top Line)

    Step 1: Before beginning, follow your company’s lock-out/tag-out procedure. Wear proper PPE. Reference the Top Line maintenance manual online for additional safety precautions and technical information at topln.co/pumpmanual. Step 2: Insert the O-ring into the carbon (no lubricant). Install the spring, cup and carbon w/O-ring onto the drive collar to create one assembly and slide it onto the stub shaft. Be sure that the “slot” in the cup aligns with the “pin” on the drive collar. Step 3: Install back plate, casing, and casing gasket and secure with casing clamp. Step 4: Slide the drive collar & seal assembly forward to the back plate until it pushes the carbon/O-ring tight up against the back plate. Now back the drive collar away from the back plate, a distance of approximately 1/32” (.79mm) and tighten the set screws. Step 5: Remove the casing and back plate. If this procedure is done properly, the pump shaft should rotate by hand. If it does rotate, or requires a lot of effort, check to ensure all components are installed and the drive collar is positioned properly.

    If you’re working with a “DG” seal, assemble the PTFE gaskets, seal seat, gland ring, and secure to the back plate by uniformly tightening the cap screws. Note: The PTFE inboard (80R) and outboard (80P) gaskets are different thicknesses. The thicker gasket (80R) must always be installed on the impeller side to prevent contact between the impeller hub and the stationary seal.

  • > Too Much Information? Not When Selecting Pumps – discussion with Jim McCormick (Application and Technical Engineer at Top Line)

    Too much information, or TMI as it’s called in social circles, is a slang term meaning ” I really didn’t need to know that”. It’s used a million times a day in legal speak, on Twitter and at the cooler in your office, but it’s never used by the people who size your pumps. Top Line utilizes several tools which assist us in selecting and sizing the correct pump for a specific need, including pump sizing programs, calculations and conversion software and well over a hundred years of experience and knowledge in our sales and technical engineering departments.The first task in sizing the proper pump is to obtain as much information about the client’s application as possible. Let’s review some of the data we request and why it’s important.Fluid Information will assist in selecting which pump is best suited, Centrifugal, Rotary Lobe or Circumferential Piston Pump.Temperature is critical to selecting the right seals and elastomers. In the case of Positive Displacement Pumps, it could also determine whether or not thermal expansion will occur, in which case, undersized rotors would come into play.Viscosity is crucial information to the determination of what type of pump to use. Higher viscosity liquids won’t move with a centrifugal pump and extremely high fluids may even cause suction problems which need to be considered.Specific Gravity is necessary in determining pump model selection as well as power required to run it.

    Flow Rate is helpful because in certain environments like breweries, for example, there may be a need to run the pump at a lower speed to prevent damage to the product, but require a high speed for CIP (clean in place). This is accomplished with the use of an AC inverter, also known as a VFD (Variable Frequency Drive).

    Discharge and Suction Pressures must be calculated to get proper performance. This is why we ask questions like line size, total feet, both vertical and horizontal, number of elbows, presense of spray balls, filters, heat exchangers, etc. All of these factors combined tell us the friction loss in the application and is considered and converted into TDH, or total head-in-feet. The souce of the liquid entering the pump inlet, like from an open tank, is important to determine if it will be adequately fed to the pump.

    Seal Type is an important decision for the long term performance and reliability of the pump based on your application. Is the fluid tacky and/or abrasive? Does it crystalize when cooled? Single mechanical or double mechanical, carbon or silicon carbide material. Buna, EPDM or FKM? We will help you make the right choice!

    Power Requirement accuracy is essential and we will determine the horsepower and speed requirements for you. What is often left unknows or unspecified is what type of motor enclosure is required. We offer Premium Efficient TEFC, wash down, stainless steel wash down, or explosion proof enclosures as well as special service motors like 575volt and 50Hz power.

    To help you select a pump now, we created a “Pump Application Data Worksheet” which addresses all the elements listed above. Once completed, we will have the information needed to prepare “your pump”, specific to “your needs.”

    Click here to download the worksheet. If you need assistance, please go to our website or contact one of our experienced employees.

  • > Controlled Sulfur Content – Why? – discussion with Brad Gregg (BPE Member and Top Line Engineer)

    Controlled sulfur content of 316L BPE fittings and other components is just one of the critical aspects of creating both consistent and quality orbital welds within a high purity tube system. BPE 2012 section MM-5.1.1 specifically states that components intended to be autogenously welded shall have a sulfur content of 0.005-0.017%. The restriction of the sulfur range of components intended to be orbital welded assist in the prevention of arc deflection which is important for proper penetration and weld pooling. Maintaining a narrow range of sulfur content also assists the weld machine operator during field installation since they can set up their orbital welding machine and make repeatable quality welds without making major adjustments to compensate for base material inconsistencies.

  • > What makes a MPTFE faced diaphragm “steam grade”? – discussion with Brad Gregg (BPE Member and Top Line Engineer)

    Steam grade MPTFE faced diaphragms are manufactured in a specific way to increase their life expectancy under repeated SIP (Steam-In-Place) conditions that occur during bioburden control of a pharmaceutical system. Modified PTFE (MPTFE) is used for steam grade rated diaphragms in lieu of virgin PTFE due to its superior physical and mechanical properties. The finished MPTFE diaphragm face has both increased resistance to cold flow (deformation of the material itself under load), and the ability to withstand both intermittent and constant elevated temperatures due to SIP. Top Line MPTFE faced steam grade diaphragms are manufactured under a unique high pressure molding process that ensures a fully homogenous part and virtually eliminates the inherent micro-fissures that are found in traditional diaphragms that are simply molded straight from base resin. This unique manufacturing process ensures longevity during repeated automation, and the repeated exposure conditions of SIP. All Top Line MPTFE faced diaphragm grades 1KS, 1PS, and BK are steam grade and have been fully tested to resist SIP conditions.