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2019

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What is the structural difference between electric gate valve and globe valve? Which one is better?

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The sealing surface of the electric gate valve has a certain self-sealing ability. The valve core is in close contact with the valve seat sealing surface through the medium pressure to prevent leakage. The inclination angle of the wedge-shaped valve core is generally 3-6 degrees. When forced to close, the temperature of the valve core changes too much or is too large, and it is easy to get clogged. Therefore, some measures must be taken in the structure of high-temperature and high-pressure wedge valves to prevent the valve core from getting stuck. When opening and closing the electric gate valve , the valve core and valve seat sealing surfaces are always in contact and friction with each other, so the sealing surface is easy to wear, especially when the valve is closed, the pressure difference between the front and rear valve cores, and the sealing surface wear is more serious.

  The sealing surface of the electric gate valve has a certain self-sealing ability. The valve core is in close contact with the valve seat sealing surface through the medium pressure to prevent leakage. The inclination angle of the wedge-shaped valve core is generally 3-6 degrees. When forced to close, the temperature of the valve core changes too much or is too large, and it is easy to get clogged. Therefore, some measures must be taken in the structure of high-temperature and high-pressure wedge valves to prevent the valve core from getting stuck. When opening and closing the electric gate valve , the valve core and valve seat sealing surfaces are always in contact and friction with each other, so the sealing surface is easy to wear, especially when the valve is closed, the pressure difference between the front and rear valve cores, and the sealing surface wear is more serious.

 

  Compared with stop valves, the main advantage of electric gate valves is small fluid flow resistance. The flow resistance coefficient of ordinary electric gate valves is about 0.08-0.12, and the resistance coefficient of ordinary stop valves is about 3.5-4.5. The opening and closing force is small, and the medium can flow in both directions. The disadvantages are complex structure, large height and size, and the sealing surface is easy to wear. The sealing surface of the stop valve must be forced closed to achieve sealing. In the case of the same caliber, the same working pressure, and the same driving device, the driving torque of the stop valve is 2.5-3.5 times that of the gate valve. This should be noted when adjusting the torque control mechanism of the electric valve.

  The sealing surfaces of the stop valve only come into contact with each other when they are fully closed. The relative slippage between the forced closing valve core and the sealing surface is very small, so the wear of the sealing surface is also very small. The sealing surface of the stop valve is seriously worn, and there are debris in front of most of the valve core and sealing surface, or the medium is washed away at high speed due to the loose closing state.

Keywords in this article: Electric gate valve