Does the emergency shut-off valve in the tank area have a special design?
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I would like to know whether the valve body, seat, and disc/plate of the pneumatic emergency shut-off valves used in hazardous material storage areas have a special design compared to ordinary on/off valves I remember having heard before about switch ball valves with a level 6 seal; the outer layer of their seat is made of PTFE, with metal inside it. If the pipeline catches fire, the PTFE may be damaged, but the metal inside can still provide a level 5 seal.
Valves for flammable and explosive media require anti-static and fire-resistant design. Write it down and ask the manufacturer, and they’ll understand what’s going on. A part that catches fire will melt and block the sealing surface.
For isolation valves used in hydrocarbon media, a fire-resistant structure is generally required; for specific details, refer to the API 607/API 6FA standards, which address such requirements. The leakage test is repeated after ignition, and a leakage amount is also specified, but it does not necessarily reach the V-level standard.
Refer to excerpts from relevant documents and specification summaries on the installation of emergency shut-off valves in tank areas for major hazard sources