The Features Of Several Types Of Gate Valves

The Features of Several Types of Gate Valves

1. Single Wedge Gate Valve

l The structure is simpler than the elastic gate valve;

l At higher temperatures, the sealing performance is not as good as the elastic gate valve or double gate valve;

l Suitable for high temperature medium that is easy to coke.

 

2. Flexibe Wedge Gate Valve

Compared with the wedge gate valve, at high temperature, the sealing performance isperfect. And the gate is not easy to be stuck after being heated. It is suitable for steam, high temperature oil, oil and gas, and other medium. But it is not suitable for medium that is easy to coke.

 

3. Double Wedge Gate Valve

l The sealing performance of double wedge gate valve is better than single wedge gate valve. If the bevel angle of the sealing surface and the valve seat are not very accurate, it still has better sealing performance.

l After the sealing surface of the wedge is worn, the metal gasket at the bottom of the top center of the spherical surface can be replaced with a thicker one. Generally, it is not necessary to overlay and grind the sealing surface. This is difficult to achieve with a single wedge and a flexible wedge.

l There are more parts than other types of gate valves;

l Besides being suitable for steam, oil and other medium, it is also suitable for switch interchange parts and medium that wears off the sealing surface. But is not suitable for media that is easy to coke.

 

4. Parallel gate valve

l The sealing performance is worse than other types of gate valves.

l Applicable to the medium with allowable temperature and pressure.

l Except that the wedges of the fixed plates on the two wedges are not easy to replace, any wedges that use lead wires to fix the two wedges can be replaced, which is not reliable in use.

l The processing and maintenance of the sealing surface of the wedge and valve seat are simpler than other types of gate valves

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