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Function of gate valve

2024-11-13


Gate valve, also known as knife gate valve, is a commonly used pipeline valve. Its main function is to open or close the fluid in the pipeline. The opening and closing of the gate valve is accomplished by moving the rising stem or handwheel, which makes its operation very simple. The characteristics of gate valves are good sealing, low pressure drop, simple structure, small volume, light weight, etc. They are commonly used in pipeline systems for conveying media such as clean water, sewage, oil and gas, to play a role in valve regulation and control. And the gate valve has a small opening range, so it is generally used to quickly shut off the flow of the medium.


Movement mode: The gate of a gate valve moves in a straight line with the valve stem, also known as a rising stem gate valve. Usually, there are trapezoidal threads on the lifting rod, which convert rotational motion into linear motion through the nut at the top of the valve and the guide groove on the valve body, that is, convert operating torque into operating thrust. When the valve is opened, when the lifting height of the gate is equal to 1:1 times the valve diameter, the fluid channel is completely unobstructed, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a marker, that is, the position where it cannot be opened, as its fully open position. To consider the phenomenon of locking due to temperature changes, it is usually done by opening the valve to the top position and then reversing it by 1/2-1 turn as the position for fully opening the valve. Therefore, the fully open position of the valve is determined by the position of the gate (i.e. stroke). Some gate valves have valve stem nuts set on the gate, and the handwheel rotates to drive the valve stem to rotate, thereby lifting the gate. This type of valve is called a rotary stem gate valve or a concealed stem gate valve.





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