Detailed Product Description Model :QF-21Working pressure:15 MpaNominal diameter:4 mmWorking medium:O2.N2,AIROutlet thread:G5/8Inlet thread:GB8335 PZ27.8 Safeguard :18-22.5MpaWe are specialized in the production of valves for various gas cylinders. It mainly produces gas cylinder valves, gas pipe valves, industrial gas decompressors, civil liquid gas boosters, brass ball valves and fuel nozzles. ...