Shaped piston valve shut-off valve

First, close the valve plunger principle consists of a stainless steel plunger down two flexible seals and a metal dam frame composition, sealing the plunger to achieve tight fit and seal, the plunger is inserted in the two seals sealed area much larger than the ordinary cut-off valve; switch plunger valve plunger seals slow-moving, the contact surface hardly wear off, the plunger is inserted under the ring, cut off the flow path; turned on, although the plunger from under the ring, but still hidden in the inner ring, keeping the outside world, it will not leak. Since the surface of the plunger through the high-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. Second, the structural characteristics of the cut-off valve shaped piston valve 1, the flow path: straight-through 2, valve, valve cover, the piston body is cast steel; stem stainless steel plunger pressure ring; seal ring, packing or flexible graphite PTFE 3, the body and the plunger seal ring inlaid with stainless steel liner at 4, with the plunger seal ring pressure ring pressing the plunger body 5, the outer diameter of the sealing ring by the plunger and body lining the inner diameter of sleeve with a seal 6, body and bonnet bolted, sealed with a gasket 7, stem seal with packing and sealing, compression packing seal 8 can be achieved, stem transmission with the stem nut rotation handwheel can open and close the valve 9, plunger valve with the structure faster than conventional piston valve opening and closing speed