Plastic Lined Valves

Authorized Parts Inc. is a certified fabricator and distributor of Plastic Lined Valves. Our wide range of linings includes Teflon Lined, PFA, ETFE, and PTFE Valves.

Plastic-lined valves have proven to be economical, highly functional, and corrosion resistant, making these valves optimal for high temperature, acidic, and corrosive environments.  Authorized Parts offers these valves in a wide range of value types and brands that include Rockwell, Nordstrom, Saunders, ITT Grinnell, McCanna, Stockham, Powell, Grove, Hill-McCanna, and Dezurik.  Available pressure classes are 150, 300, 600, 900, and 1500.  The body materials of these plastic-lined valves include cast steel, cast iron, ductile iron, polypropylene, PVC, 316SS, and alloy 20.

Contact Authorized Parts for your valve needs.  

Properties of common plastic linings: 

PTFE (Polytetrafluoroethylene) should not be used in applications exceeding 406 f degrees (operating temperature) in severe corrosive applications.

PTFE is non-wetting, therefore it does not absorb any of the service media

PTFE is mechanically weak, requiring mechanical support. This means erosion should be a concern, as is the property of creep or cold flow under load. 

For greater temperature tolerance and more flexible mechanical properties, other linings with better temperature range, chemical resistance, and mechanical properties need to be considered. PFA (Perfluoroalkoxy) and other Fluoropolymers are fully fluorinated materials (perfluoro polymers) and partially fluorinated types containing hydrogen and/or chlorine. The fully fluorinated group includes PTFE, PFA, and FEP (fluorinated ethylene propylene).

Options for valves with linings include the following types: Gate Valve, Check Valve, Diaphragm Valve, Ball Valve, Butterfly Valve, Plug Valve, and Pressure Relief Valve. 

Standards

Teflon PTFE Polytetrafluoroethylene, PFA Perfluoroalkoxy, PVDF Polyvinylidene Fluoride, Kynar, PP Polypropylene, ETFE Ethylenetetrafluoroethylene aka Tefzel, are all applied in accordance with manufacturers standards and procedures outlined by producers of CI, Cast Iron, DI Cast ductile iron, FS Forged steel, CS Cast steel, Alloy 20, Monel, Hastelloy C,  by ANSI American National Standards Institute, ASTM American Society for Testing and Materials F1545, and ASTM consolidated plastic lined piping standards.

Compliances:

PTFE — Polytetrafluoroethylene ASTM D4894, D4895

PFA — Perfluoroalkoxy ASTM D3307

PVDF — Polyvinylidene Fluoride ASTM D3222, D5575

PP — Polypropylene Type I, Type II Copolymer ASTM D4101

Valve

A valve is designed to stop or regulate flow. A lined valve functions in the same way as an unlined valve, with increased life and increased performance. ANSI Standard lined butterfly valves, ball valves, swing check valves or trunnion mounted ball valves offer low maintenance and better user experience. Increased performance, superior service life with zero leakage shutoff, makes PTFE, PFA, PVDF, and PP  seat or lining options critical in valve selection, regardless of pressure or size. Proven design features of the wafer and lug type butterfly valve offer a lighter, more economical selection than a globe valve for throttling applications. The butterfly valve can also be easily automated with manual, pneumatic or electric actuators. Below, we will discuss the advantages and functionality of each material for different types of valves. Whether wastewater treatment, chemical processing, or power generation systems with severe conditions, plastic lined valves offer features that are key to chemical compatibility.

PTFE Teflon Lined Valves

Polytetrafluoroethylene (PTFE) Teflon is the leading plastic lining used for valves. High-quality PTFE Lined Valves, PFA Lined Valves, and FEP Lined Valves like Ball Valves, Diaphragm Valves, Non-Return Valves, Butterfly Valves, and Plug Valves are commonly linked as a safe and reliable solution for corrosive applications. PTFE lined valves can be used as an anti-static lining on plastic-lined valves manufactured from carbon steel or high-grade alloys.

PFA Lined Valves

(Perfluoroalkoxy) PFA fluoropolymer has shown better permeability resistance than PTFE in valve lining applications and can be used in service temperatures up to 500°F (operating temperature) and maintains extremely high chemical resistance in severe corrosive applications. PFA-lined valves have excellent universal resistance to solvents and chemicals, outstanding electrical properties as a static lining, do not support combustion, have good low-friction properties, and minimal operating cost. The PFA lined valve can be used in electric valve automation, or with pneumatic actuators with limit switches

as a reliable solution for lowering maintenance costs. PFA is a more economic alternative than glass lining used in similar applications, providing a ruggedized design solution for automated valves.

PVC Lined Valves

(Polyvinyl Chloride) PVC conforming to ASTM D 1784, Classification 12454 B is the most frequently specified of all thermoplastic exotic lining materials. It is successful for chemical processing, industrial plating, chemical drainage, fresh and waste water treatment, chilled and tower cooling water, deionized water manufacture, and distribution. PVC is characterized by high physical properties and resistance to chemical attack by strong acids and other oxidizers, alkalis, salt solutions, some organic chemical solutions, and many other chemicals and has extremely high chemical resistance in severe corrosive applications

CPVC Lined Valves

(Chlorinated Polyvinyl Chloride) CPVC conforming to ASTM D 1784, Classification 23447-B, is a resin created for resistance to chemical attack and is almost identical to PVC. The physical properties of CPVC are very similarto those of PVC at 73° F, but the additional chlorine in the CPVC polymer extends itsmaximum service temperature from140° F to 210° F(operating temperature) and maintains extremely high chemical resistance in severe corrosive applications

PVDF / Kynar Lined Valves

(Polyvinylidene Fluoride) PVDF homopolymer conforming to ASTM D 3222, Type I, Grade 2, is a tough, abrasion-resistant fluorocarbon material that has design

stress of 1,360 psi at 73° F (operating temperature)and a maximum service temperature of 280° F. It has versatile chemical resistance to salts, strong acids, dilute bases, and many organic solvents, such as the aromatics (i.e., benzene ring structure), the aliphatic (i.e., paraffin, olefin, and acetylene hydrocarbons), and the chlorinated groups. And PVDF is ideally suited for handling wet or dry chlorine, bromine, and other halogens that require extremely high chemical resistance in severe corrosive applications.

Polypropylene Lined Valves

(Polypropylene) PP as specified by ASTM D 4101, is a member of the polyolefin family of pure hydrocarbon plastics. Although PP has half the strength of PVC and

CPVC, with design stress of 1,000 psi at 73° F(operating temperature), may have the most versatile chemical resistance of the thermoplastic materials identified as the sentinels of industrial piping. Note: there are no known solvents for Polypropylene, thus it is well suited for extremely high chemical resistance in severe corrosive applications.

FKM Lined Valves

(Fluoroelastomer) FKM is compatible with a broad spectrum of chemicals. Because of this extensive chemical compatibility, spanning wide ranges of concentration and

temperature, FKM has gained wide acceptance as a material of construction for valve“O”-rings and seats. These fluoroelastomers can be used in most applications

involving mineral acids (with the exception of HCl), salt solutions, chlorinated hydrocarbons, and petroleum oils. FKM is not recommended for alkali solutions.

Butterfly valves 

Butterfly valves are throttling valves. Lined butterfly valves offer a low cost means of regulating severe service media like hydrochloric acid, sulfuric acid where chemical compatibility of the valve liner is critical to performance. Features include Bi-Directional Bubble-tight shutoff, Large Cv and easy Automation. There are many options and components for tough piping system conditions. For more information about valve manufacturers offering liner materials and seals for control valves, contact Authorized Parts, Inc. 

Butterfly valve

An option for a high-temperature butterfly valve is available as a ceramic-lined valve. The seat is bonded to the valve body and encapsulated, isolating the valve body from the service media. The lining material is S-SiC, Sintered Silicon Carbide Ceramic. The butterfly valve stem is a  one-piece design stem assembly in 17-4PH stainless steel material for high performance. 

There are additional valve solutions for temperatures exceeding 500F.

Ball Valves

Ball Valves are the most popular type of plastic-lined valve. Their open-close quarter-turn design offers safety, addresses fugitive emissions, and has a positive economic impact on plant output. The body material is determined by varying temperature, corrosion, and pressure ranges. Corrosion resistance, the lowest torque for automation and low maintenance over the entire productive life-span make the ball valve the most effective stop valve design solution for different applications and processes

Lined Ball Valves

Ball valves used for on/off service. They are shutoff valves, isolation valves, and stop valves with a simple 90-degree turn that allows or stops the flow when rotated 90 degrees. They are perfect candidates for plastic linings due to their simplicity. One or two-piece ball valve designs eliminate cavitation, resulting in higher temperature/pressure ratings, eliminating hysteresis, and reduces the potential of the ball or stem failure. Standard Epoxy Coated Body and stainless steel internals provide maximum corrosion protection. 

Plastic Lined Diaphragm Valves

The Construction of a Lined Diaphragm Valve consists of a rigid body cast or forged in Bronze, Stainless Steel (316), Cast Steel, Alloy 20 CN7M, Monel, Hastelloy or Ductile 

Iron in sizes (1/2” thru 12”) with a weir placed in the flow path (Weir type) or unobstructed flow path (Straightway), a flexible diaphragm at the center, a compressor which is used to force the diaphragm against the weir, and the bonnet, which can be a handwheel or an air motor for pneumatic actuation. Plastic lining selection is a function of the service media and service temperature. Diaphragm valve lining options, including rubber linings, are Glass Lined, Soft Rubber, Hard Rubber, Butyl Lined, Hypalon Lined, PVC Lined, PP Lined (FDA), Tefzel Lined and PVDF* Lined (FDA). Consult our corrosion resistance guide for material selections.

Extremely High Chemical Resistance

Chemical resistance is a key consideration for the piping system designer in selecting materials. Many conditions can affect the material choices. Careful consideration must be given to temperature, pressure, and chemical concentrations before a final material can be selected. Thermoplastics, elastomers, valve type, body material, and lining material all possess physical characteristics that are sensitive to environmental and service conditions. For that reason, Authorized Parts, inc. has provided a selection guide to reference for applications involving extremely high chemical resistance for leak-free operation.

How to order Plastic Lined Valves

To order please select the valve or fitting type, size, pressure class, body material, and end connections. Valve application parameters should be outlined when submitting a lining selection for verification of compatibility. Specify service media and service media temperature and include the type of lining desired.

Submit your RFQ on Authorized Parts website easy to use form at: https://www.authorizedparts.com/request-a-quote-2/

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