Valves, Regulators, and Seals

High-performance polymers for demanding valve, regulator, and sealing applications

The polymers used for the sealing surfaces in valves and regulators must have low enough compressive modulus (stiffness) to conform to irregularities in mating metal surfaces while also being strong and stiff enough to maintain a seal. Additionally, plastic valve components must be able to operate in the presence of the process fluids without degrading from chemical attack and without contaminating the liquid or gas being processed. The plastics that are used for the friction and wear surfaces in valves must be carefully formulated to achieve the desired actuation torque. Finally, the specified plastic must have all of these properties throughout the operating temperature of the valve.

Benefits of High Performance Plastics for Sealing Components in Valves and Regulators:

  • Moderate compressive stiffness for consistent sealing performance
  • Compatible with a wide variety of industrial chemicals
  • Purity – won’t contaminate process fluids
  • Capable of operating from cryogenic to elevated temperatures
  • Low friction to achieve the desired actuation torque without the use of external lubricants
  • Low wear on mating metal parts
  • Excellent creep and stress relaxation characteristics to ensure reliable sealing
  • Dimensional stability for tight tolerance sealing applications
  • Sound damping characteristics for reduced operating noise compared with all metal valve designs
  • Vacuum compatibility

Plastic Materials for Valves, Seals, and Regulators

acetal-sheet-rod-tube-bw

Acetal

High strength, stiff, low friction engineering plastic with good wear properties.

ptfe-group-white

PTFE

Low friction engineering plastic with outstanding chemical, high temperature, and weathering resistance.

pvdf-sheet-natural

PVDF

High purity engineering plastic with excellent chemical, abrasion, and flame resistance.

fep-group-natural

FEP

Flexible fluoropolymer with outstanding chemical resistance and electrical properties.

pfa-group-white

PFA

Flexible fluoropolymer that performs well in extreme temperature and harsh chemical environments.

ETFE in varying shapes and sizes displayed next to one another

ETFE

Plastic material with excellent mechanical strength, stiffness, and abrasion resistance.

ectfe-halar-rod

ECTFE

Fluoropolymer with outstanding mechanical properties and dimensional stability.

pctfe-group-white

PCTFE

Fluoropolymer with outstanding dimensional stability, mechanical properties, and temperature range.

peek-sheet-rod

PEEK

Strong, stiff plastic with outstanding chemical resistance; performs over a wide range of temperatures.

two stacked sheets of white polypropylene

Polypropylene

Low cost, chemical resistant plastic with excellent aesthetic qualities.

exp-pvc-sheets-gray

PVC

Strong, stiff, versatile low cost plastic material that is easy to fabricate, bond, and weld.

PAI-sheet-rod

PAI

Extremely stong, stiff, dimensionally stable plastic material often used in elevated temperature environments.

vespel-plaque-rod

DuPont™ Vespel® Polyimide

Extremely high temperature creep resistant plastic with excellent friction and wear characteristics.

Valve Components Manufactured from High Performance Polymers

  • Valve seats
  • Valve bodies
  • Seals
  • Pintle tips
  • Balls
  • Gaskets
  • Poppets
  • Bushings

Acetal (Delrin®)

Acetal is an engineering plastic with low friction, good chemical resistance, and outstanding machining characteristics.

Fluoropolymers (PTFE, PVDF, FEP, PFA, ETFE, ECTFE, and PCTFE)

Fluoropolymers are plastics with high operating temperatures, purity, and stain resistance.

PEEK

PEEK is a high performance polymer that can be used at high and low temperatures. Excellent chemical resistance and stain resistance. Low leaching and low outgassing help to maintain the purity of process fluids. Friction and wear grades have outstanding wear performance.

Polypropylene

Polypropylene is a low cost machinable plastic with excellent chemical resistance.

PVC

PVC is a chemically resistant plastic that is easy to assemble via solvent cements or thermoplastic welding.

PAI (Torlon®)

PAI is a strong and stiff high-performance polymer that can be used at elevated temperatures. Bearing grades have excellent friction and wear characteristics.

DuPont™ Vespel® Polyimide

DuPont™ Vespel® Polyimide is a high performance polymer with excellent sealing characteristics. It can be used in extreme temperature environments. Friction and wear grades have low friction and outstanding wear properties.

 

Continue Your Research

Not sure which materials best fit your needs?

Our experienced sales and technical teams are available to assist you with material selection challenges.

FAQs

Do you have plastics that can operate in the presence of aggressive chemicals?

What plastics materials have low friction and long wear life so that they can freely slide against mating metal surfaces when a valve is actuated?

Which polymers can be used in elevated temperature environments?

Which plastics will maintain purity and not contaminate process fluids?

Which plastics will maintain tight seals over long periods of time?

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