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What kind of cast steel gate valves.


Author : Hebei Eurasian Metal Plumbing Industries Co., Ltd. Date : 5/22/2016 7:56:41 PM
Cast steel gate valve type, 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.
Cast steel gate valve is closed, 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 is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface sealing.
Cast steel gate valve gate, linear motion, with the stem called lifting lever gate valve (also called rising stem gate valves).
Usually in lifting lever on the trapezoidal thread, through the valve at the top of the nut and guide groove on the valve body, the rotation movement into linear motion, which is the operating torque thrust into operation.
Open valve, when the gate hoisting height is equal to valve size 1:1 times, fluid channels open completely, but at runtime, the position cannot be monitored.
Actual use, is the stem apex as a sign, that is fixed position, as 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.Valve in full open position, therefore, according to the location of the damper (namely travel > to determine.
Some gate valve, the valve stem nut is located in the gate, the hand wheel rotation drive the valve rod rotation, and make the disc, the valve is called rotating lever gate or non-rising stem gate valves.
1, installation location, altitude, direction must comply with the design requirements of imports and exports, connection should be firmly connected.
2, all kinds of manual valves installed on the thermal insulation pipe, handle shall not down.
3, cast steel gate valves, a visual inspection must be conducted before installation, the valve nameplate should be consistent with existing national standards "universal signal valve" GB 12220.For the working pressure is greater than 1.0 MPa and valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use.
Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5 min, shell and packing shall be no leakage of valve shall be qualified.
Leak test, the test pressure is 1.1 times the nominal pressure;The duration of the test pressure in the test should comply with the standard of GB 50243 requirements, with no leakage for qualified for valve sealing surface.

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