Application Conditions and Operation of Gate Valves
Classification:
Release Time：2019-07-22
Gate valve refers to the valve that the closing member moves in the vertical direction along the center line of the passage. Gate valve in the pipeline can only be fully open and fully closed cut off, can not be used for adjustment and throttling. Gate valve is a valve with a wide range of use. Generally, cut-off devices with a diameter greater than 50mm are selected, and cut-off devices with a small diameter are sometimes selected. The gate has two sealing surfaces, the most commonly used mode gate valve two sealing surfaces to form a wedge, wedge angle varies with the valve parameters. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce micro-deformation to improve its manufacturability. When the gate valve is closed, the sealing surface can only
Gate valve refers to the valve that the closing member moves in the vertical direction along the center line of the passage. Gate valve in the pipeline can only be fully open and fully closed cut off, can not be used for adjustment and throttling. Gate valve is a valve with a wide range of use. Generally, cut-off devices with a diameter greater than 50mm are selected, and cut-off devices with a small diameter are sometimes selected.
The gate has two sealing surfaces, the most commonly used mode gate valve two sealing surfaces to form a wedge, wedge angle varies with the valve parameters. The gate of the wedge gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce micro-deformation to improve its manufacturability.
When the gate valve is closed, the sealing surface can only rely on the medium pressure to seal, that is, the sealing surface of the gate pressure to the other side of the valve seat to ensure the sealing surface of the seal, which is self-sealing. Most gate valves are forced to seal, that is, when the valve is closed, it is necessary to rely on the external force to press the gate to the valve seat to ensure the sealing surface.
The gate of the gate valve with the stem for linear motion, called the lifting rod gate valve. Usually in the lifting rod on the trapezoidal thread, through the top of the valve nut and the valve body on the guide groove, the rotary motion into a linear motion, that is, the operating torque into the operating thrust.
When the valve is opened, when the gate lift height is equal to 1:1 times the diameter of the valve, the fluid channel is completely unobstructed, but during operation, this position cannot be monitored. In actual use, the apex of the valve stem is used as a sign, that is, the position that does not move, as its fully open position. In order to consider the locking phenomenon of temperature change, it is usually opened to the top position and then reversed.1/2~ 1 turn, as a fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate, that is, the stroke.
1, the gate valve is usually used to open and close the occasion, can not be used for throttling applications.
2. The gate valve is usually installed on the horizontal pipeline, and the valve stem is vertically upward. It can also be installed in vertical pipes or horizontal pipes where the stem is not vertically upward, but special structures may be required depending on the size of the valve, the application environment and the specific circumstances of the material. If the gate valve you purchased from Wuhan Xiete Valve Technology Co., Ltd. is ready to use a special installation method, the orientation of the valve can be explained when ordering.
3. For the application environment with high temperature, it is recommended to use flexible or split wedge-shaped gate to avoid the wedge-shaped gate being stuck due to thermal expansion.
4. When used in high-speed fluid or thermal cycling applications, in order to avoid loosening, the threaded seat ring should be lock welded to the valve body.
5. After closing the gate valve, the valve stem should be slightly rotated (1/81/4circle) to release the stem load. This allows the valve stem to expand slightly without jamming or damaging the valve, nor affecting the closing effect.
6. If the seat ring mounting lugs are removed, the highly integrated shut-off gate valve can be used in hot water outlets or in piping systems using soft iron.
7. The pump station uses valves that are not restricted by the site, have more debris in the water, and are easy to block important positions. The flashlight dual-purpose gate valve can be used.
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2026/02/28
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