Working principle of the large diameter bellows gate valve

according to the sealing surface configuration can be divided into wedge type gate valve and parallel sluice gate valve gate, wedge gate valve gate can be divided into: single gate type, double disc and flexible disc; Parallel slide gate valve can be divided into single ram and double ram.

according to the threads of the valve stem position, can be divided into rising stem gate valves and dark bar gate valve two kinds.

1。 Large-diameter gate Industrial Valves closing

sealing surface can only rely on medium pressure to seal, that depend on medium pressure, the disc will be to the other side of the valve seat sealing surface pressure to ensure that the seal face seal, this is the seal. Most is adopt compulsory seal gate valve, the valve

the door is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface sealing. The gate valve gate, linear motion, with the stem called lifting lever gate ( Also called rising stem gate valves) 。 Usually on the lifting rod

a trapezoidal thread, through the valve at the top of the nut and guide groove on the Industrial Valves body, the rotary motion to linear motion, which is the operating torque thrust into operation.

2。 Large-diameter gate valves open

when ram hoisting height is equal to valve size 1:1 times, fluid channels completely open, but at runtime, the position cannot be monitored. When actual use, is the stem apex as a logo, we can't start position, namely a

for its full open position. To consider locking phenomenon in a temperature change, usually in the open to the vertex positions, pour 1/2-1 ring back, as the full open position of the valve. The valve fully open position, therefore, according to the location of the damper ( The travel

>.

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