Piston valve is cover, stem, plunger hole frame, sealing rings, hand wheels and other parts from the body, valve. When the hand wheel is rotated by stem drive plunger reciprocates hole down the middle frame to complete the valve opening and closing function. In the valve plunger and the seal between the ring with the interference fit, by adjusting the gland flange bolts, the sealing ring compression lateral forces generated in the valve body bore surface and cylindrical plunger seal, thus ensuring the valve sealing, eliminate the internal and external leakage while the valve opening torque is small, can achieve rapid valve opening and closing.

 

   Close plunger valve consists of a stainless steel plunger down two flexible seals and a metal bulkhead composition, sealing effect by the plunger and seal tight fit to achieve, the plunger is inserted in the two seals, the seal area much larger than the ordinary cut-off valve; switch plunger valve plunger slowly moving in the ring, the contact surface is hardly worn off, the plunger is inserted under the ring, cut off the flow path; when open, although departing from the plunger seal ring, but still hidden in the ring, keeping the outside world, it will not leak.
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   Since the surface of the plunger through precision cylindrical grinding machine processing. Seal ring with elasticity, high wear resistance, non-toxic new sealing material, a reliable seal and durable. Thereby increasing the life of the valve plunger.