PTFE (Polytetrafluoroethylene)
A fluoropolymer with near-universal chemical resistance and very low friction coefficient. Used in valve seats (soft seat ball valves), stem packing, seat rings, and diaphragms. Temperature range: -200 degrees C to +260 degrees C. Creeps under load at high temperatures - use filled PTFE (glass, carbon, or graphite-filled) for better dimensional stability.
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What is PTFE (Polytetrafluoroethylene) used for in industrial valves?
A fluoropolymer with near-universal chemical resistance and very low friction coefficient. Used in valve seats (soft seat ball valves), stem packing, seat rings, and diaphragms. Temperature range: -200 degrees C to +260 degrees C. Creeps under load at high temperatures - use filled PTFE (glass, carbon, or graphite-filled) for better dimensional stability.
When should I specify PTFE (Polytetrafluoroethylene) for valve body or trim?
PTFE (Polytetrafluoroethylene) is specified when the process fluid, temperature, or pressure requirements exceed what standard carbon steel (A216 WCB) or austenitic stainless steel (A351 CF8M) can handle. Material selection must consider corrosion rates, maximum and minimum design temperatures, and compliance with NACE MR0175 for sour service. Vajra Industrial Solutions can supply valves in PTFE (Polytetrafluoroethylene) with full mill certificates.
Is PTFE (Polytetrafluoroethylene) compatible with sour (H2S) service per NACE MR0175?
Material qualification for sour service (NACE MR0175 / ISO 15156) depends on the hardness limits, heat treatment condition, and UNS designation of the specific alloy. For H2S-containing service, the valve material order and PMI (positive material identification) must be verified against the applicable NACE material group. Contact Vajra Industrial Solutions for material recommendations specific to your H2S partial pressure and chloride conditions.
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