Double block and bleed design(DBB)
- Double stem sealing.
- The ball can maintain pressure sealing of pipeline when it is closed or fully opened.
- Shorter upper sleeve reducces bearing load and operation torue
- Limit device ensures the accurate opening and closing position of the valve.
- The ball and stem are separated so as to reduce stem load.
- The stem adopts anti-blow-out design.
- The sealing surface is inserted into te metal seat by polymer or plastic
- The metalbacked self-lubricating PTFE bearing and PTFE thrust washers
- Reduce the opening torque and prolong the service life of the valve.
- Stem leakage can be prevented through the emergency grease fitting.
Drive actuators offered for the knife gate valve include handwheel with rising or non-rising stem, or alternatively double or single-acting pneumatic cylinders, Bevel Gear, electric actuators.
Cylinder & Solenoid (FESTO,AirTAC,HERION,ASCO,UNIWO,SMC)/ Positioner(YTC,ABB, SIEMENS,AZBIL)/Filter/ Limit switch(OUMRON,FESTO,IFM,P+F)