Lifting-type check valve capable of reducing harm of water attack

Abstract

The invention provides a lifting-type check valve capable of reducing the harm of water attack. The lifting-type check valve comprises a valve body, a valve seat, a valve deck, a bush, a valve elementand a compression spring and further comprises a sealing piece and a connecting piece which are adopted. The lifting-type check valve is characterized in that a small check valve sealed by a small steel ball is arranged in the sealed end of the valve element of the lifting-type check valve; the small check valve is formed by adopting the sealed end of the valve element of the lifting-type check valve as a valve body and adding an outer hexagonal hollow plug and the small steel ball for combination; and an inner hexagonal hollow plug and a filter net are further mounted at an inlet of the small check valve. When the water attack phenomenon occurs, the pressure is relieved through the small check valve, thus the phenomenon and harm of water attack are reduced, and compared with other measures for preventing and reducing the phenomenon of water attack, the advantages that the size of original equipment or pipeline is not increased, and the cost is the lowest are achieved.

Description

technical field [0001] The present invention relates to check valves in industrial machinery, fluid equipment or pipelines. Background technique [0002] In petrochemical, steam power generation, water supply and drainage and other fluid equipment, there are inevitable changes in flow rate and pressure fluctuations; especially in fluid equipment or pipelines where check valves are installed, the water flow caused by the sudden closure of the check valves The strike phenomenon is even more inevitable. The super-normal pressure generated by water hammer has a great influence on equipment or pipelines, causing severe vibration and deformation in light, and damage to parts and accidents in severe cases. Although people can take measures such as adding safety valves, exhaust valves, traps or accumulators, shortening or thickening pipelines, and slowly opening and closing valves in equipment or pipelines to reduce the phenomenon and harm of water hammer; The above measures will ...

AI Technical Summary

Problems solved by technology

The supernormal pressure generated by water hammer has a great impact on equipment or pipelines, causing severe vibration and deformation in light cases, and damage to parts and accidents in severe cases

Although people can take measures such as installing safety valves, exhaust valves, steam traps or accumulators, shortening or thickening pipelines, and slowly switching valves in equipment or pipelines to reduce the phenomenon and hazards of water hammer; The above measures will be limited by many objective factors, and will significantly increase the manufacturing cost of equipment or pipelines

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