Load Sensing Pressure Filter Valve

Abstract

The invention discloses a load sensing pressure filter valve. The load sensing pressure filter valve comprises a valve body and a first damping disk, a second damping disk, a steel ball, a spring anda thread sleeve that are arranged in the inner cavity of the valve body in sequence, wherein an opening A is formed in the lower part of the valve body; the first damping disk is arranged at the smallpore diameter position of the inner cavity of the valve body in a sliding manner; a first damping hole is formed in the first damping disk; a first valve opening and a second damping hole are formedin the second damping disk; an opening B is formed in the upper part of the thread sleeve; the steel ball and the spring are arranged in the inner cavity of the thread sleeve; the spring enables the steel ball to maintain a trend of blocking the first valve opening; when an oil liquid flows to the opening B from the opening A, the first damping disk slides upwards to block the second damping hole,and the oil liquid from the opening A flows into the opening B after flowing through the first damping hole and the first valve opening and pushing the steel ball away; and when the oil liquid flowsinto the opening A from the opening B, the first damping disk slides downwards, the oil liquid flows into the opening A from the opening B after flowing through the axial clearance among the second damping hole, the first damping disk and the second damping disk and the first damping hole. The load sensing pressure filter valve has the benefits as follows: the processing is simple, and the load sensing pressure fluctuation is effectively buffered.

Description

technical field [0001] The present invention relates to the technical field of control valve manufacturing, in particular to a load-sensitive pressure filter valve, in particular to a load-sensitive pressure filter valve used in load-sensitive systems of engineering machinery such as wheel loaders, cranes, and mini-excavators . Background technique [0002] Quantitative load sensing system is widely used in construction machinery such as loaders, truck cranes and small excavators because of its energy saving and low cost. The load-sensing multi-way reversing valve is the core component of this type of load-sensing system, and the quantitative load-sensing system needs to realize the on-demand distribution of actuator flow, and the two-way pressure compensation valve is an indispensable component of this type of hydraulic control system. In actual application conditions, since the load pressure fluctuates from time to time, the opening of the feedback spool will fluctuate, w...

AI Technical Summary

Problems solved by technology

It adds a first damper in the load pressure feedback chamber to buffer the load sensitive pressure fluctuation, but because the damping is too simple, the buffer for the load pressure fluctuation is not ideal, so its structure needs further improvement

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