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The movement of a gate valve
When the gate valve is closed, the sealing surface can rely solely on the medium pressure for sealing; that is, it relies solely on the medium pressure to press the sealing surface of the gate plate against the valve seat on the other side to ensure the sealing of the sealing surface. This is self-sealing. Most gate valves use forced sealing; that is, when the valve is closed, external force must be used to forcibly press the gate plate against the valve seat to ensure the sealing of the sealing surface.
Movement method: The gate plate of the gate valve moves linearly with the valve stem, also called an OS&Y gate valve. There is usually a trapezoidal thread on the lifting stem. Through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is converted into linear motion, that is, the operating torque is converted into operating thrust. When opening the valve, when the gate plate lifting height is equal to 1.1 times the valve diameter, the fluid passage is completely unobstructed, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as a mark, and the position where it cannot be opened is used as its fully open position. To consider the phenomenon of deadlocks caused by temperature changes, usually at the apex position, it is turned back by 1/2-1 turn as the fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate plate (i.e., stroke). Some gate valves have a valve stem nut on the gate plate. The handwheel rotates to drive the valve stem to rotate, thus lifting the gate plate. This type of valve is called a rotary stem gate valve or a non-rising stem gate valve.
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