... -metal diaphragm 3, Used in precise analysis instrument, and environmental i CO two stage pressure regulator TypeInput pressureOutput pressureFlow rateYQJ/YQJF-115Mpa0.45Mpa0 ... such as H2,O2,N2,CO,CH4,HE,NE,AR and etcYQJF series for corrosive Gases such as NH3,SO2,H2S ...