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Valve closed, the sealing surface can only rely on media pressure to seal, that is, only to rely on the media

 

The sealing surface pressure ram pressure 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 is, when the valve is closed, the gate forced to rely on external pressure to the seat, to ensure the sealing surface of the sealing.

Exercise: The gate valve with the valve stem linear movement, also called clear shot valve. Often movements are trapezoidal threaded rod through the guide groove valve and the valve on top of the nut, and the rotary motion into linear motion, which is the operating torque thrust into action. Open the valve, when the gate valve lift height equal to diameter of 1: 1 times, the fluid channel is completely smooth, but at run time, this position can not be monitored. Actual use, is the apex of stem as a sign that does not move the location, as its fully open position. Temperature appears to consider locking phenomenon, usually open to the vertex position, and then rewind 1 / 2-1 circle, as the location of a fully open valve. Accordingly, the fully open position of the valve, according to damper position (ie, travel> to determine. Some valve stem nut located at the gate, handwheel drive stem rotation, leaving the gate to upgrade, this valve is called rotating rod valve or valve called the dark bar.