... valve, pneumatic butterfly valve 2) Ball valve: quick-installed ball valve, without resort-liquid ball valve, without dead angles ball valve, threaded three and ball valve, flange ball valve ... type check valve, movable check valve 4 ) Diaphragm valve: quick-installed diaphragm valve, triplet diaphragm valve, U-type diaphragm valve5) Sample valves, stop reversing valves, forged ...