Design and type of plunger valve
Structure and type of plunger valve:
Threaded connection or socket welding connection with straight through plunger valve
1. Flow channel: straight-through type
2, body, cover for cast steel or cast steel, plunger, stem, isolation ring for stainless steel. The sealing ring is made of flexible graphite or teflon
3, sealing ring, isolation ring by the valve body and bonnet connection bolts, nuts, spring pad pressure
4, the outside diameter of the plunger and the sealing ring to achieve sealing
5. The opening and closing speed of the valve is slow
Two. Welding connection of straight through plunger valve
1. Flow channel: straight-through type
2, valve body, cover material for cast steel
3. Other structural features are of the same order
Flange connection with straight through plunger valve
1. Flow channel: straight-through type
2, body, cover for cast steel or cast steel, plunger, stem, isolation ring for stainless steel. The sealing ring is made of flexible graphite or teflon
3, sealing ring, isolation ring by the valve body and bonnet connection bolts, nuts, spring pad pressure
4, the outside diameter of the plunger and the sealing ring to achieve sealing
5. The opening and closing speed of the valve is slow
Flange connection pressure balance straight through plunger valve
1. Flow channel: straight-through type
2, body, cover for steel casting: stem, plunger, isolation ring for stainless steel; Sealing ring, packing for flexible graphite or teflon; Stem nut is of copper alloy
3, sealing ring, isolation ring by the valve body and bonnet connection bolts, nuts and spring washer pressure
4, the outer diameter of the plunger and the inner diameter of the sealing ring to achieve sealing
5. The plunger is hollow, the upper and lower cavities have through holes, and the valve stem is connected with a sealing sleeve and a nut, so that the pressure in the upper and lower cavities of the plunger is balanced and the opening and closing time is less effort. However, the stem should have an upper seal and a packing seal
6. The opening and closing speed of the valve is slow
Globe valve type plunger valve
1. Flow channel: straight-through type
2, valve body, cover, plunger body for cast steel; Valve stem, plunger pressure ring for stainless steel; Sealing ring, packing for flexible graphite or teflon
3, the valve body and plunger seal ring is inserted with stainless steel bushing
4, seal ring with plunger pressure ring on the plunger body
5, the outer diameter of the plunger sealing ring and the inner diameter of the valve body bushing to achieve sealing
6, the body, cover with bolt connection, sealing with gaskets
7, stem seal with packing and upper seal, compression packing can achieve sealing
8, stem drive with stem nut, rotation of the handwheel can open and close the valve
9, the structure of the plunger valve than the conventional opening and closing speed of the plunger valve
Flanged double seat pressure-balanced straight-through plunger valve
1. Flow channel: double-port straight-through type
2, valve body, upper cover, lower cover are cast steel; Stem, plunger, isolation ring is stainless steel; Sealing ring, packing for flexible graphite or teflon
3, sealing ring, isolation ring plunger guide to apply the upper cover, lower cover, bolts, nuts, spring gaskets pressed in the body
4, the plunger can move up and down in the upper and lower sealing rings and guide sleeve, guide sleeve is equipped with pressure balance hole, medium pressure can enter the lower chamber of guide sleeve through the hole. The double sealing surface of the plunger and the double sealing ring in the valve body can achieve the sealing
5, the valve is the internal thread plunger valve, can be through a large flow, because the plunger is short, the opening and closing speed is larger than the conventional plunger valve
6, stem seal with upper seal and packing, pressure packing gland can achieve stem seal
7, stem nut mounted on the business cover on the rotation of the handwheel can drive the plunger valve open and close
Plunger valve is mainly composed of valve body, cover, stem, plunger, hole frame, sealing ring, handwheel and other parts. When the handwheel rotates, the valve can be opened and closed by the reciprocating movement of the plunger in the middle of the hole frame driven by the valve stem. In the plunger valve USES the interference fit between plunger and seal ring, by adjusting the gland flange bolts, make the seal ring compression side force generated by the Great Wall round hole surface and column in the seal to the valve body, so as to ensure the valve's sealing, put an end to the internal and external leakage, plunger valve small open torque, at the same time to achieve rapid opening and closing valve. The surface of the plunger is machined by a high precision cylindrical grinder. The sealing ring adopts non-toxic new sealing material with strong elasticity and high wear resistance, so the sealing is reliable and durable. Thus increased the service life of the plunger valve. General plunger valves are reduced diameter valves, so in the selection of the pipeline should pay attention to the flow requirements.