21005 series pneumatic single-seat adjusting valve, introduced from America Masoneilan company, simple structure, wide used in power station, chemical, refinery, metallurgy for system controlling

Structure principle

Signal pressure from regulator, input into air room of ∑F actuator, drive valve spool, position of valve spool changes, make the change of flow area, then control the flow of media

Structure features: large guide area, wide use. Equipped with ∑F actuator, suitable for high pressure. Valve seat connected to valve body with thread. The sealing surface of valve spool, valve seat use surfacing carbide, exceed the using life. Sealing between valve seat and valve spool: soft, hard sealing, small leakage

Material of valve body: SCPH2（WCB）　　SCPH21（WC6）　　SCS14A（CF8M）