A gas spring relief valve

Abstract

The invention discloses a gas spring overflow valve. The overflow valve comprises a limiting nut, a piston push rod, pistons, a spring, a valve core, a valve sleeve, a valve seat, a valve body and a piston cylinder. According to the gas spring overflow valve, two pistons with large diameter difference are arranged on the upper and lower ends of the gas spring, and the large piston which is located on the upper end is used for quickly establishing the internal pressure of the gas spring; the small piston which is located on the lower end is connected with the valve core of the overflow valve and is used for outputting thrust to the valve core of the overflow valve; and the diameter of the small piston is small, therefore, the change of the internal volume of the gas spring is small in the process that the valve core is opened, and the internal pressure of the gas spring can be basically kept constant, i.e. the thrust of the gas spring to the valve core can be kept constant all the time in the process that the valve core is opened. According to the gas spring overflow valve, clever structural design is utilized, so that the problem of large pressure adjustment deviation of a traditional indirect detection type overflow valve is effectively solved.

Description

technical field [0001] The invention relates to a gas spring overflow valve, which belongs to the field of electro-hydraulic control. Background technique [0002] The traditional direct-acting relief valve relies on setting the pre-compression of the pressure regulating spring to set the working pressure of the relief valve. As the overflow flow increases, the opening of the relief valve gradually increases, that is, the overflow The displacement of the valve spool gradually increases, the pressure regulating spring is further compressed, and the spring force acting on the spool increases, so the inlet pressure of the relief valve increases with the increase of the overflow flow, which makes the relief valve appear relatively large. A large pressure regulation deviation will have an adverse effect on the performance of the relief valve. Compared with the direct-acting relief valve, the pressure regulation deviation of the traditional indirect detection pilot relief valve i...

AI Technical Summary

Problems solved by technology

In the process of setting the pressure of the relief valve, the hydraulic system often works under high pressure and large flow conditions, which not only affects the service life of the hydraulic system, but also causes waste of energy

Images