The way the gate valve moves

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 must be forcibly pressed to the valve seat by external force to ensure the tightness of the sealing surface.

Movement mode: 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 operating thrust. When the valve is opened, when the ram lift height is equal to 1:1 times the valve diameter, the flow of the fluid is completely unobstructed, but this position cannot be monitored during operation. In actual use, it is marked by the vertex of the stem, that is, the position that cannot be opened, as its fully open position. In order to account for the lock-up phenomenon of temperature changes, it is usually opened to the apex position, and then reverted back to 1/2-1 turn as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the ram (i.e. stroke). Some gate valve stem nut is located on the gate, and the handwheel rotates to drive the valve stem to rotate, and the gate plate is lifted, this valve is called a rotary rod gate valve or a dark rod gate valve.

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