The most widely used national standard gate valve is the wedge gate valve. Its structural feature is that the two sealing surfaces on the wedge gate and the sealing surfaces of the two navigation grooves on the valve body form a sealing pair to achieve the sealing effect. Its structure is simple, and the fluid is small, and it is often used for long-distance transportation, pipelines and devices for water, oil, gas and other media. The purpose of using the wedge gate is to increase the auxiliary sealing load, so that the metal-sealed mode 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 seal specific pressure at the inlet end of the metal-sealed mode gate valve produced by the wedging action is often not enough to achieve the inlet end seal. Therefore, the metal-sealed mode gate valve is a single-sided forced seal.
Applicable occasions of mode gate valve:
The scope of application and structural characteristics of the national standard wedge valve, among various types of valves, the gate valve is the most widely used one. It is generally only suitable for fully open or fully closed, and cannot be used for adjustment and throttling.
Mode 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 relatively harsh. 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.