Eccentric swing check valve

Abstract

The invention discloses an eccentric swing check valve. The eccentric swing check valve comprises a valve plate, a valve seat and a valve body which is of a hollow structure, wherein the hollow structure penetrates through the valve body and forms a fluid cavity; the side wall of the fluid cavity is inwards extended with the valve seat; the inner side wall of the valve seat is provided with a ring-shaped compacted surface; the center line of the ring-shaped compacted surface tilts relative to the center line of the fluid cavity; the valve plate is positioned in the fluid cavity and is in pivotal connection with the valve body around a pivotal line; the valve plate is divided into a first part for opening and closing the fluid cavity and a second part for balancing the first part through the pivotal line; the first part is provided with a ring-shaped sealing surface which is in matched sealing with the ring-shaped compacted surface; and under co-action of first moment of force, relativeto the pivotal line, of gravity borne on the first part, and second moment of force, relative to the pivotal line, of gravity borne on the second part, the valve plate constantly has the trend of rotating for enabling the ring-shaped sealing surface to match with or separate from the ring-shaped compacted surface to close or open the fluid cavity. The eccentric swing check valve has the advantages of being simple in structure, reliable in operation, easy to open and close, and suitable for horizontal mounting and vertical mounting.

Description

technical field [0001] The invention relates to the field of valves, in particular to an eccentric swing check valve. Background technique [0002] In a pipeline system driven by a pump, the fluid flow rate and pressure in the pipeline will change sharply due to actions such as opening the valve, closing the valve and stopping the pump, forming a water hammer, and the water hammer will cause certain harm to the pipeline system. In order to reduce the harm of water hammer to the pipeline system, a check valve is usually installed at the outlet of the pump. [0003] Check valve, also known as one-way valve or non-return valve, is an automatic valve used to prevent fluid backflow in one-way pipelines. It relies on the pressure of pipeline fluid flow to open or close the valve itself, so check valves are widely used in pipeline systems middle. [0004] According to a mechanical anti-hammer butterfly check valve disclosed in Chinese patent CN205315784U, it includes a valve body...

AI Technical Summary

Problems solved by technology

The patented check valve realizes the slow closing of the disc plate through additional devices such as springs and cylinders. The structure is complex, which reduces reliability, and the performance of the spring in high-temperature media decreases, so the applicability is poor.

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