Introduces the working principle of gate valve

    Working principle

    Gate valve is a gate opening and closing parts, RAM direction of motion perpendicular to the direction of the fluid, valve can only be fully open and fully closed, can not be adjusted and the throttle.There are two gate sealing surface, the most common mode of gate valve sealing surface to form two wedge, wedge angle varies with the valve parameters, usually 5 °, medium is not high temperatureis 2 ° 52'. Wedge gate valve can be made into a whole, called the rigid gate; also be made to produce small deformation of the gate,in order to improve its process, make up the sealing surface angle deviations arising during processing, this gate is called the flexible gate. 

     Valve closed, the sealing surface can only rely on media pressure to seal, that media pressure will depend on the sealing surface pressure gate to the other side of the seat to ensure the sealing surface of the seal, which is self sealing. Most of the valve is sealed by force, that the valve is closed, to rely on external pressure to force the gate to the seat, to ensure the sealing surface of the seal. 

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     Gate valve with the valve stem with a straight line, called the lift rod valve is also called the Ming bar gate valve. Usually in the lift rod with trapezoidal thread, through the guide groove nut valve and the valve on the top, the rotary motion into linear motion,which is the operating torque thrust into operation. Open the valve, when the gate valve lift height is equal to 1:1 times the diameter, the fluid flow channel completely, but at run time, this position is unable to monitor.

      Actual use, is the apex of the stem as a symbol, which means that the fixed position, as its full open position.Temperature changes appear to consider locking phenomenon,usually open to the vertex position, and then rewind 1/2 1 circle, as a fully open valve position. Therefore, the fully open position of the valve, press the disc position that trip to determine. 

     Some valve, the stem nut is located at the gate, hand wheel rotation to drive the valve rod, leaving gate to upgrade, this valve is called the rotating rod valve or valve called the dark bar.

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