Safty valve for LP-gas (propane) and NH3 1.Max. Working Pressure: 1.8Mpa, 2. ... .Thread: ZG1/4" 3.safety pressure valv Safety valve for LP-gas piping, dispenser, LPG station.when pressure increase beyond a predetermined ... is fully open.Safety valve for LPG dispenser . Rogo design. LP-gas safty valve for Propane,Anhydrous Ammonia , Rego