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Application conditions and operation of gate valve

time:2015/11/21from:Hangzhou Kaiwei Valve Group Co., LTD
Gate valve is a valve that is moving along the central line of the central line of the central line. Valve in the pipeline can only be fully open and fully closed off with, can not be adjusted and the throttle. Valve is a valve using a wide range, the general diameter DN is equal to or larger than 50mm cutting device use it, sometimes a small diameter cutting device also use valve.
Gate has two sealing surfaces, the most commonly used mode gate valve sealing surface to form a wedge, wedge angle varies with the valve parameters, usually 50, medium temperature is not high for 2 degrees 52'. Wedge gate valve gate can be made into a whole, called the rigid gate; also can be made to produce micro deformation of the gate, in order to improve its process, to make up the sealing surface angle in the process of deviation, which is called the gate.
Gate valve is closed, the sealing surface can only rely on media pressure to seal, that is, on the media pressure to seal the sealing surface of the gate to the other side of the valve seat to ensure the sealing surface of the seal, which is self sealing. Most of the valve is sealed by force, that is, when the valve is closed, to rely on external forces to force the gate valve to the valve seat, to ensure the sealing surface of the seal.
Gate valve with the valve stem to make a straight line movement, called the lift rod valve (also called the gate valve). Usually in the lift rod with a trapezoidal thread, through the valve at the top of the nut and the body of the guide groove, the rotary motion into linear motion, that is, the operating torque into the operating thrust.
When the valve is opened, when the gate valve to increase the height of the 1:1 times the diameter of the fluid, the fluid channel is completely smooth, but at run time, this position is unable to monitor. When the actual use, is the stem of the apex as a symbol, that is, open position, as it is the full open position. In order to consider temperature changes occur locked phenomenon, usually open to the vertex position, and then rewind 1 / 2-1 circle, as a fully open valve position. Therefore, the valve fully open position, according to the location of the gate (that is, stroke, to determine the.
1 gate valve is usually applied to open - off occasions, can not be used for throttling applications.
2 gate valve is usually installed in horizontal pipe, the valve stem perpendicular to the top. Can also be installed in vertical pipe or valve stem is not vertical to the horizontal pipe, but according to the valve diameter size, application environment and material specific circumstances, may require special structure. If the purchase of the valve to use a special installation method, then in order, the valve should be the direction of the.
3. For more than 260 C application environment temperature, it is recommended using flexible or split wedge, avoid wedge due to thermal expansion and stuck. This situation may occur in the valve cold closed and then hot open state.
4 when used in high speed fluid (Tuan Liu) or thermal cycling, in order to avoid release, the threaded valve seat ring should be locked in the valve body. Please specify when ordering.
5 after closing the gate valve, the valve stem should be a little (1/8 to 1/4), to release the stem load. This allows the valve stem can be a little expansion, will not get stuck or damage the valve, it will not affect the closure effect.
6. If the removed seat ring installation lugs, the overall height of the valve closed can be used in the hot water outlet or soft iron piping is used. Please specify when ordering.
Using 7. Pumping station not subject to site constraints, debris in the water more easily plug the important position of the valve, dual valve flashlight can be used; hand valve can be used, especially in the pumping station renovation project can be used in the valve to make efficient use of the space of the original pump room, reaching under the premise of the original pumping station area in the same for increasing the (row) of water.
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