Pneumatic piston cut off what are the major parts material?

Pneumatic piston cut off ( Short piston cut-off valve) , it is pneumatic execution units in the unit combination instrument. It receives signals from the monitoring instrument, fluid control technology of the pipe cutting and connected or switch port. The product has a large operating force, the body design, small flow resistance, large rated flow coefficient, allowable differential pressure big sealed performance is good wait for an advantage. Therefore widely used in petroleum, chemical, metallurgy, electric power, textile and other industrial sector production process automatic control and remote control system. When the signal pressure is zero, because of the spring ( Single acting only) Pre-tightening force, so that the valve core in the initial state ( Normally open or normally closed) 。 When the received signal pressure actuator ( 0. 4 to 0. 6MPa） , the compression spring driven push rod, valve body, valve core moves to limit position, make the valve fully open or close. Medium of the pipe connected, cut off or switch between line control. With two tees electric injection valve, make the piston cut-off valve control more convenient and simple. The major parts material: the body and bonnet: HT200, ZG230 - 450, ZG1Cr18Ni9Ti, ZGOCr18Ni12Mo2Ti seat: 1 cr18ni9ti, Cr18Ni12Mo2Ti valve core: 1 cr18ni9ti, Cr18Ni12Mo2Ti cylinder block: ZG230 - 450 piston: ZAlSi12 packing: ptfe, flexible graphite soft seal valve core: enhanced ptfe