Self-sealing swing soft seal check valve

Abstract

The invention discloses a self-sealing swing-type soft-sealed check valve, which comprises a valve body in which a liquid inlet chamber and a liquid outlet chamber communicated with each other are arranged in the valve body. A rocker is hinged in the valve body and is connected with a movable The valve plate that blocks the liquid inlet chamber and the liquid outlet chamber, the outer surface of the valve plate is covered with an elastic sealing layer; one end face of the valve plate is a connection end face for connecting with the rocker, and the other end face is a sealing end face; The inner end surface of the cavity wall of the liquid inlet chamber is provided with a counterbore so that a transitional step is formed between the liquid inlet chamber and the counterbore; the elastic sealing layer on the sealing end surface of the valve plate contacts and cooperates with the transitional step to form a shaft. Axial sealing pair for radial sealing; after the elastic sealing layer on the outer peripheral surface of the valve plate contacts and cooperates with the hole wall of the counterbore, a radial sealing pair for realizing radial sealing can be formed. The check valve has a simple structure, has dual effects of axial sealing and radial sealing, and is not easy to cause leakage or leakage even when the fluid pressure is low.

Description

technical field [0001] The invention relates to a self-sealing swing-type soft-sealing check valve. Background technique [0002] At present, the known swing-type soft-sealed check valve includes a valve body, which is provided with a liquid inlet chamber and a liquid outlet chamber that communicate with each other. The outer surface of the valve plate blocked by the liquid outlet chamber is covered with an elastic sealing layer; one end surface of the valve plate is a connection end surface for connecting with the rocker, and the other end surface is a sealing end surface. The sealing principle is that the valve plate rotates around the pin shaft in the valve body, and the sealing end surface of the valve plate seals the inner port of the liquid inlet chamber, and the elastic sealing layer on the sealing end surface is compressed and deformed by the fluid pressure and the self-weight of the valve plate to realize the sealing. Block the liquid inlet and outlet chambers. Th...

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Problems solved by technology

The disadvantage of the check valve with the above structure is that when the fluid pressure is low, the elastic sealing layer on the sealing end face is less deformed under pressure, which may easily cause leakage or leakage of the valve.

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