Safety valve

Abstract

The invention belongs to the technical field of industrial valves, and discloses a safety valve which includes a main valve body, a main valve core, a main valve control rod and a rotating shaft. Themain valve control rod and the rotating shaft are arranged in parallel and are both connected to the main valve body, wherein the main valve control rod can move relatively in an axial direction and is provided with a clamping groove, the main valve core sleeves the rotating shaft and is provided with a shield cover and a guide rail, the guide rail is spirally and axially arranged along the outersurface of a guide sleeve and penetrates through the clamping groove, and through the connection between the guide rail and the clamping groove, the main valve core rotates around the rotating shaft with the axial movement of the main valve control rod, so that the shield cover is driven to carry out open and close control over a main channel between an oil inlet and an oil outlet in a horizontaldirection. According to the safety valve, the main valve core can be prevented from being stuck due to concentricity, the smooth operation of the overflow action is ensured, the protection of a sealing surface is improved, the opening and closing impact is reduced, the service life of the entire safety valve is prolonged, and the work stability is improved.

Description

technical field [0001] The invention belongs to the technical field of industrial valves, and in particular relates to a safety valve. Background technique [0002] Pilot-operated safety valve is the best overpressure protection device for pressurized equipment, containers or pipelines, and is mainly used in petroleum, chemical, electric power, metallurgy and other fields. However, during the process of processing and assembling the safety valve, its subsequent actual use performance will be affected due to various reasons. [0003] At present, in conventional pilot-operated safety valves, the opening and closing action of the safety valve is realized by the relative axial movement between the main valve core and the main valve seat on the same axis. However, in the process of processing and assembly, due to the accumulation of errors, sometimes the concentricity of the main valve core and the main valve seat will deviate, resulting in insensitivity of the main valve moveme...

AI Technical Summary

Problems solved by technology

However, in the process of processing and assembly, due to the accumulation of errors, sometimes the concentricity of the main valve core and the main valve seat will deviate, resulting in insensitivity of the main valve movement, and thus the safety valve cannot be opened smoothly under the rated pressure

In addition, when the main spool is opened, there will be impurities attached to the sealing surface of the main spool, and the presence of impurities will lead to poor sealing of the main spool when it is closed, and will affect the sealing of the main spool and the main valve seat. In addition, the main valve core will collide with the sealing surface of the main valve seat when it is opened and closed, which will further damage the sealing surface of the main valve core and the main valve seat and affect the service life.

In addition, when the traditional pilot-operated safety valve is working, the opening and closing action of the main valve is usually relatively rapid, resulting in a large pressure shock, which will bring a great burden to the system where it is located and cause system losses. Affect the service life of the system

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