Metal Seat
A valve seat made from metal (hard-faced Stellite, stainless steel, or Inconel alloy overlay) rather than soft materials (PTFE or elastomer). Handles temperatures beyond soft seat limits (above 200 degrees C or below -46 degrees C) and abrasive services. Leakage rate is higher than soft seat (ANSI Class IV vs Class VI).
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Frequently Asked Questions
What is Metal Seat used for in industrial valves?
A valve seat made from metal (hard-faced Stellite, stainless steel, or Inconel alloy overlay) rather than soft materials (PTFE or elastomer). Handles temperatures beyond soft seat limits (above 200 degrees C or below -46 degrees C) and abrasive services. Leakage rate is higher than soft seat (ANSI Class IV vs Class VI).
When should I specify Metal Seat for valve body or trim?
Metal Seat 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 Metal Seat with full mill certificates.
Is Metal Seat 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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