... globe valves,check valves,safety valves,ball valves,butterfly valves,diaphragm valves,mud valve ect.And it has complete inspection ... leakge of airtight seal.2,With a unique structure,easy and flexible for operation with labor saving and long service ... , 316, 304L, 316L, 38CrMoAlA, 25Cr1MoV7) Packing: graphite 8) Operating type: worm gear, pneumatic actuatorDrawing and technique data sheet will be ...