Detachable axial-flow type check valve normally-open structure

Abstract

The invention discloses a detachable axial-flow type check valve normally-open structure. The detachable axial-flow type check valve normally-open structure comprises a valve clack, a fairing and a guide rod connected with the valve clack, a spring mounting boss is arranged at the end, away from the valve clack, of the guide rod, a compression spring is mounted on the spring mounting boss, and a shaft sleeve sleeves the outer side of the end, close to the valve clack, of the guide rod. The shaft sleeve limits the stroke of the compression spring, the shaft sleeve and the fairing are clamped and fixed, and a shaft sleeve gland for preventing the shaft sleeve from rotating is arranged on the outer side of the shaft sleeve. According to the detachable axial-flow type check valve normally-open structure, a valve can be maintained to be normally open when a system is in a low-power operation condition, and meanwhile online maintenance can be conveniently conducted.

Description

technical field [0001] The invention relates to a normally open structure of a detachable axial flow check valve used in the field of valves. Background technique [0002] The traditional axial flow check valve adopts a normally closed structure. When the valve is opened, the working medium first needs to overcome the friction force generated by the spring force and the self-weight of the opening and closing parts, resulting in a large opening pressure difference of the valve. Under normal circumstances, the force of the working medium is often slightly greater than or even less than the friction force generated by the spring force and the self-weight of the opening and closing parts. The axial flow check valve has insufficient opening height, and the valve may not be able to open in severe cases. For passive systems that rely on the self-gravity of the medium to drive the fluid circulation of the system, the selection of normally closed valves cannot meet the working requir...

AI Technical Summary

Problems solved by technology

[0002] The traditional axial flow check valve adopts a normally closed structure. When the valve is opened, the working medium first needs to overcome the friction force generated by the spring force and the self-weight of the opening and closing parts, resulting in a large opening pressure difference of the valve. Under normal circumstances, the force of the working medium is often slightly greater than or even less than the friction force generated by the spring force and the self-weight of the opening and closing parts. The axial flow check valve has insufficient opening height, and the valve may not be able to open in severe cases.

For passive systems that rely on the self-gravity of the medium to drive the fluid circulation of the system, the selection of normally closed valves cannot meet the working requirements of the system. In severe cases, the valve may even fail to open, resulting in a system loss of water accident.

[0003] In addition, in order to ensure the flow capacity of the conventional axial flow check valve, the valve body is designed as one piece. If the valve and the pipeline are welded and connected, it is impossible to carry out online maintenance for common faults such as wear and tear of the moving parts of the valve and gap inclusions. The valve and pipeline are cut The maintenance period is long, the number of repeated welding with pipelines is limited, the reliability verification of valves and pipelines after welding is difficult, and the risk of maintenance personnel being affected by radiation is high

For valves serving in irradiation areas, traditional axial flow check valves can no longer meet the service requirements of areas with irradiation and high risks

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