When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, only rely on the medium pressure to press the sealing surface of the ram to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves are forcibly sealed, that is, when the valve is closed, the ram should be forced to the valve seat by external force to ensure the tightness of the sealing surface.
Movement method: The gate plate of the gate valve moves in a straight line with the valve stem, which is also called the open rod gate valve. Usually there is a trapezoidal thread on the lifting rod, through the nut at the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is changed into the operating thrust. When the valve is opened, when the ram lifting height is equal to 1:1 times the valve diameter, the flow of the fluid is completely unobstructed, but during operation, this orientation is unsupervised.
In actual use, it is marked by the pole of the valve stem, that is, the direction of the opening, as its full opening direction. In order to consider the lock-up phenomenon of temperature changes, it is usually reversed to 1/2-1 turn in the direction of the pole as the direction of the fully open valve.
Therefore, the full opening orientation of the valve is determined by the orientation of the ram (i.e., the stroke). Some gate valve stem nuts are located on the gate plate, and the handwheel rolls to drive the valve stem to roll, and the gate plate is lifted, and this valve is called the rotary rod gate valve or the dark rod gate valve.
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