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what is gate valve working principle

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Gate valve working principle

The disc of a gate valve moves in a straight line with the stem, also known as a rising stem 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, to change the rotation motion to a straight line, that is, to change the operating torque to the operating thrust.When the valve is opened, when the gate lift height is equal to 1:1 of the valve size, the flow passage is fully open, but this position cannot be monitored during operation.In practice, it is marked by the peak of the stem, that is, the open position, as its full open position.In order to allow for temperature changes in the appearance of locking, usually at the top of the open position, and then back 1/2-1 turn, as the full open valve position.Therefore, the full open position of the valve is determined by the position of the gate (i.e. the stroke >).Some gate valve stem nuts are located in the gate plate, handwheel rotation drives the stem rotation, and the gate plate lift, this valve is called rotary stem gate valve or dark stem gate valve.
gate valve
Gate valve installation and maintenance

1. Handwheel, handle and transmission mechanism are not allowed to be used for lifting and collision is strictly prohibited. 

2. Double gate valve should be installed vertically (i.e. the valve stem is in a vertical position and the hand wheel is on the top).

3. gate valve with bypass valve should be opened before opening the bypass valve (to balance the pressure difference between the inlet and outlet and reduce the opening force). 

4. The gate valve with transmission mechanism shall be installed according to the provisions of the product operation manual.

5. If the valve is often switched on and off, lubricate it at least once a month.

6. The gate valve is only used for fully opening and closing all kinds of pipelines or media on the equipment. It is not allowed to be used for throttling.

7. For gate valve with handwheel or handle, auxiliary barbars shall not be added during operation (in case of loose sealing, check and repair sealing cover or other parts).

8. Turn the handwheel and handle clockwise to close, and vice versa.The gate valve with drive mechanism should be used according to the product instruction.