Locking device for hydraulic valve pressure adjustment

Abstract

The invention relates to a locking device for hydraulic valve pressure adjustment. The locking device comprises an adjusting piece in threaded connection to the interior of a spring cavity of a valvesleeve, and the back end of a spring in the spring cavity forms supporting through the adjusting piece. The locking device is characterized in that the adjusting piece is a cylindrical threaded column, a step through hole is formed in the center of the threaded column, a large hole part of the step through hole is a polygonal hole facilitating manual tool insertion for rotating the threaded column, the threaded column is further provided with an expansion threaded hole penetrating in the axial direction, the threaded column is further provided with a strip-shaped notch extending the radial direction and penetrating in the axial direction, the strip-shaped notch penetrates the expansion threaded hole and the step through hole, and the expansion threaded hole is internally in threaded connection with a fastening screw capable of expanding the strip-shaped notch to be opened. After locking is achieved through the locking device, the adjusting piece cannot move after long-time use, the adjusting piece does not need to be adjusted, and the spring can be kept at the set pressure.

Description

technical field [0001] The invention relates to a hydraulic valve, in particular to a locking device for pressure regulation of a hydraulic valve, wherein the hydraulic valve can be a pressure regulating valve, a relief valve or a balance valve. Background technique [0002] The control valve is one of the main components of the hydraulic system. It generally includes a valve housing with various oil ports on it, and a movable valve core in the valve housing. The valve port in the valve housing is realized by the movement of the valve core. Whether it is opened or closed determines the flow direction of the oil circuit in the valve housing. Generally, the movement of the spool is driven by oil pressure or solenoid valve or exposed drive, while the reset of the spool is reset by the spring. When the external force is greater than the elastic force of the spring, it will push the spool to move and open the valve port, and the external force becomes smaller or cancelled. Final...

AI Technical Summary

Problems solved by technology

[0005] The existing adjustment structure locks the position of the adjustment screw through the thread connection force between the adjustment screw and the spring chamber. Due to the existence of errors in various components, the degree of thread engagement between the external thread of the adjustment screw and the internal thread of the spring chamber Limited, after a long time of use, the adjusting screw may loosen, resulting in the preset pressure of the hydraulic valve not meeting the design requirements, which requires maintenance personnel to re-adjust the adjusting screw, and after multiple adjustments, the adjusting screw and the inner Easy to wear between the threads, and the adjustment screws are more likely to loosen

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