Pneumatic diaphragm bellows sealing adjusting valve, with reliable sealing performance, prevent waste or environment pollution by media leakage. Especially suitable for regulating highly toxic, expensive, volatile and porous media

Structure principle

Pneumatic diaphragm bellows sealing adjusting valve, is the improved product based on pneumatic diaphragm single, double-seat adjusting valve. Made up of pneumatic diaphragm actuator and bellows sealing valve

Inside upper valve cover, there installed bellows components, isolate media and outside, keep valve stem move up and down. And, on the up side of upper cover, is PTFE”V”-type filler sealing, if bellows components broken, can be as the second sealing. Upper cover also installed with pressure meter, for indicating the pressure outside the bellows, if bellows broken, the indication of pressure meter will change

Principle: when air-room of actuator receive pneumatic signal, thrust diaphragm, spring compress, drive thrust stem, valve stem, valve spool to move, change the flow area between valve spool and valve seat, change the flow, achieve processing parameters automatic adjustment