Self-sealing swing flexible-sealing check valve

Abstract

The invention discloses a self-sealing swing flexible-sealing check valve which comprises a valve body. A liquid inflow cavity and a liquid outflow cavity which are communicated with each other are formed in the valve body. A rocking bar is hinged into the valve body and connected with a valve plate capable of blocking the liquid inflow cavity and the liquid outflow cavity. The outer surface of the valve plate is coated with an elastic sealing layer. One end face of the valve plate is a connecting end face used for being connected with the rocking bar and the other end face of the valve plate is a sealing end face. A counter-bored hole is formed in the inner end face of the cavity wall of the liquid inflow cavity, so that a transitional step is formed between the liquid inflow cavity and the counter-bored hole. After the elastic sealing layer on the sealing end face of the valve plate makes contact and is matched with the transitional step, an axial sealing pair for achieving the axial sealing purpose can be formed. After the elastic sealing layer on the outer circumferential face of the valve plate makes contact and is matched with the hole wall of the counter-bored hole, a radial sealing pair for achieving the radial sealing purpose can be formed. The check valve is simple in structure and has the double effects of axial sealing and radial sealing, and seepage or leakage is unlikely to happen 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...

AI Technical Summary

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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