Thread plug-in mounting type oil filling valve

Abstract

The invention relates to a thread plug-in mounting type oil filling valve. The objective of the invention is to solve the technical problems of poor reliability, no wear resistance and high opening pressure of the existing oil filling valve. The thread plug-in mounting type oil filling valve provided by the invention comprises a blanking cap, a sealing pad, a screw, a spring, a valve sleeve and a valve core of the oil filling valve, the valve sleeve is cylindrical, a spring return cavity is arranged at the middle of one end of the valve sleeve, an oil filling cavity is arranged at the other end of the valve sleeve, a guide hole is formed in the middle of the valve sleeve, the guide hole is communicated with the spring return cavity and the oil filling cavity, an oil through hole is formed in the valve sleeve and is communicated with the oil filling cavity, the valve core of the oil filling valve is composed of a cylindrical guide bar and a conical oil sealing block, the valve core of the oil filling valve is arranged in the valve sleeve, an annular oil through gap is formed between the cylindrical guide bar and the guide hole, the spring is installed at one end of the cylindrical guide bar and is fixed by the screw, the conical oil sealing block of the valve core of the oil filling valve is arranged at an oil outlet of the oil filling cavity of the valve sleeve and is in tight fit with the same, the blanking cap is connected with the spring return cavity, and the sealing pad is arranged between the blanking cap and the valve sleeve.

Description

technical field [0001] The invention relates to a threaded plug-in oil replenishment valve, in particular to an oil replenishment valve installed on a multi-way valve and used to prevent cavitation when a hydraulic cylinder falls by its own weight. Background technique [0002] In the hydraulic system of construction machinery, multi-way reversing valves are generally used to realize centralized control of multiple oil cylinders. If the oil cylinder needs to be lowered quickly, after the handle controls the reversing, the oil cylinder will be lowered rapidly due to the self-weight of the components and the working load. If the oil supply in the upper cavity is insufficient, a negative pressure is formed, which limits the maximum descending speed. At this time, the oil replenishing valve is installed, and the oil replenishing valve can be opened in time to quickly replenish oil into the fuel tank, which can speed up the descending speed of the oil cylinder. . The A port of ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of poor reliability, wear resistance, high cracking pressure and inconvenient assembly of the existing oil replenishment valve during use, and to provide a threaded plug-in oil replenishment valve

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