The Sealing Principle Of Wedge Gate Valve

The sealing principle of the wedge gate valve is based on the tight combination of the two sealing surfaces on the wedge gate and the two sealing surfaces on the valve body to achieve the seal. The purpose of using the wedge gate is to increase the auxiliary sealing load, so that the metal hard-seal wedge gate valve can seal both high medium pressure and low medium pressure. When closing, rotate the valve stem clockwise to make the sealing surface of the gate valve and the sealing surface of the valve body close to achieve a seal. However, the metal-sealed wedge-type gate valve produced by the wedging action is often not enough to achieve the inlet-side seal due to the specific pressure of the inlet end seal produced by the wedging action. Therefore, the metal-sealed wedge gate valve is a single-sided forced seal.

Among various types of valves, gate valves are the most widely used one. It is generally only suitable for fully open or fully closed, and cannot be used for adjustment and throttling. Wedge gate valve application range: Wedge gate valve is widely used in petrochemical, thermal power plants and other oil and steam pipelines as opening and closing devices for connecting or cutting off the medium in the pipeline. Wedge gate valves are generally used in occasions where there is no strict requirement on the external dimensions of the valve, and the use conditions are more demanding. Such as the working medium of high temperature and high pressure, it is required that the closing parts must be sealed for a long time. Generally, the use conditions or requirements require reliable sealing performance, high pressure, high pressure cut-off (large pressure difference), low pressure cut-off (small pressure difference), low noise, cavitation and vaporization, high temperature medium, low temperature (cryogenic), it is recommended to use Wedge gate valve. Such as the electric power industry, petroleum refining, petrochemical industry, offshore oil, water supply engineering and sewage treatment engineering in urban construction, chemical industry and other fields.