A21F Safety Valve, A21F Spring Micro-Opening Safety Valve, A21F-16C A21F-16P External Thread PTFE Seal LPG Liquid Ammonia Relief Valve GB JIS ASME

**A21F safety valve** is spring micro-opening safety valve. **A21F safety valve** uses PTFE soft seal for reliable tight sealing, zero leakage. A21F adopts external thread plus welded nipple for easy pipeline installation. Suffix C of A21F = WCB carbon steel body, suffix P of A21F = 304 stainless steel body. **A21F safety valve** suitable for LPG, liquid ammonia, petroleum gas, air, max working temperature ≤80℃. When tank or pipeline pressure exceeds set pressure, A21F safety valve opens automatically for pressure relief and closes automatically after pressure drop to protect pressure vessel. A21F safety valve widely used in LPG storage tank, liquid ammonia pipeline, gas equipment and small pressure vessels. A21F safety valve complies with GB/T12243, GB, JIS, ASME standards, custom A21F set pressure available.