Self-tightening seal vacuum-breaking valve

Abstract

The invention relates to a self-tightening seal vacuum-breaking valve which comprises a valve body, a high temperature resistant O-shaped sealing ring, a stainless steel ball, a guide sleeve, a thread gland bush, a valve cover and a gasket seal; wherein, the stainless steel ball can freely move in the guide sleeve, the flow area between the stainless steel ball and the guide sleeve is larger than the area of flow passage, self-tightening seal is formed between the stainless steel ball and the high temperature resistant O-shaped sealing ring, the thread gland bush slightly presses the guide sleeve which presses the high temperature resistant O-shaped sealing ring, and the valve body is provided with two flow passages, one of which is smooth and the other one is closed by the stainless steel ball. The valve cover is connected with the valve body by screw thread or welding. The invention has reliable sealing structure, easy processing and low cost, can be disassembled and washed, rapidly and accurately eliminates the vacuum in the system, and allows larger positive pressure of device memory.

Description

technical field [0001] The invention relates to a vacuum breaking valve device for quickly eliminating system vacuum and ensuring equipment safety and reliability, in particular to a self-tightening and sealing vacuum breaking valve. Background technique [0002] At present, the vacuum breaking valve is mainly produced by some foreign companies. The valve body basically adopts a welded structure and cannot be opened. If there is dirt on the flow channel or sealing surface that affects the seal, it cannot be cleaned. Its sealing structure adopts hard seal, and the sealing is realized by the line contact between the high-roundness steel ball and the high-precision spherical surface, which requires a very high roundness of the ball, and at the same time, the sealing surface of the valve body needs high-precision grinding, resulting in complicated processing and high cost. High and expensive. Contents of the invention [0003] The object of the present invention is to overcom...

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Problems solved by technology

[0002] At present, the vacuum breaking valve is mainly produced by some foreign companies. The valve body basically adopts a welded structure and cannot be opened. If there is dirt on the flow channel or sealing surface that affects the seal, it cannot be cleaned.

Its sealing structure adopts hard seal, and the sealing is realized by the line contact between the high-roundness steel ball and the high-precision spherical surface, which requires a very high roundness of the ball, and at the same time, the sealing surface of the valve body needs high-precision grinding, resulting in complex processing and low cost. high and expensive

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