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Introduction to several kinds of gate valves

Time : 2022-12-01 Hits : 6

(1) Wedge single gate valve

① The structure is simpler than that of elastic gate valve;

② At higher temperatures, the sealing performance is not as good as that of elastic gate valve or double gate valve;

③ Suitable for high temperature medium easy to coke.

(2) Elastic gate valve

It is a special form of wedge single ram. Compared with wedge gate valve, it has good sealing performance at high temperature, and the gate is not easy to get stuck after being heated; It is suitable for steam, high temperature oil, oil and gas and other media, and is suitable for the parts with frequent switching. It is not suitable for media easy to coke.

(3) Double disc gate valve

① The sealing performance is better than that of wedge gate valve. If the oblique angle of the sealing surface and the seat fit are not very accurate, the valve still has good sealing performance;

② After the sealing surface of the ram is worn, replace the metal gasket at the bottom of the spherical top center with a thicker one for use. Generally, it is not necessary to weld and grind the sealing surface, which is difficult to do with single ram and elastic ram.

③ More parts than other types of gate valves;

④ In addition to steam, oil and other media, it is also suitable for the parts with frequent switching and the media with large wear on the sealing surface. It is not suitable for the media easy to coke.

(4) Parallel gate valve

① The tightness is worse than that of other gate valves;

② Suitable for medium with low temperature and pressure;

③ Except that the ram with fixed plate on the two rams is not easy to fall off, the ram with lead wire fixing the two rams is easy to fall off, and the use is not reliable.

④ The processing and maintenance of the sealing surface of the gate and valve seat are simpler than those of other types of gate valves.