All the valves conform to national and international advanced standards, such as ANSI,BS,DIN,GB, size:1/4"~56",class:150Lb-2500Lb,working temperature-196 degrees celsius to 680 degrees celsius, material including carbon steel,stainless steel, cryogenic service steel,special alloy:Inconel 625,F51,Monel, Titanium, Hastelloy,Etc.