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Parallel Gate Valve vs Wedge Gate Valve

  • 2021-05-03 19:59

According to the structure of the gate valve, it can be divided into:

1) Parallel gate valve: The sealing surface is parallel to the vertical centerline, that is, a gate valve with two sealing surfaces parallel to each other.

Among the parallel gate valves, the structure with thrust wedge is the most common. There are double-sided thrust wedge between the two gates. This kind of gate valve is suitable for low-pressure medium and small diameter (DN40-300mm) gate valves. There is also a spring between the two gates. The spring can generate pre-tightening force, which is beneficial to the sealing of the gate.

2) Wedge gate valve: the sealing surface is at a certain angle to the vertical centerline, that is, the two sealing surfaces are wedge-shaped. The inclination angle of the sealing surface is generally 2°52', 3°30', 5°, 8°, 10°, etc. The size of the angle mainly depends on the temperature of the medium. Generally, the higher the working temperature, the larger the angle should be to reduce the possibility of wedging when the temperature changes.

In the wedge gate valve, there are single gate, double gate and elastic gate. The single gate wedge gate valve has simple structure and reliable use, but it has high requirements on the accuracy of the angle of the sealing surface, processing and maintenance are difficult, and the possibility of wedging when the temperature changes is high. Double ram wedge gate valves are often used in water and steam media pipelines. Its advantages are that the accuracy of the angle of the sealing surface is low, the temperature change is not easy to cause the phenomenon of wedging, and the gasket can be added to compensate when the sealing surface is worn. However, there are many structural parts of this kind, which are easy to bond in the viscous medium, which affects the sealing. More importantly, the upper and lower baffles are prone to rust after long-term use, and the gates are easy to fall off. 

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