Pressure compensation valve and load sensory system

Abstract

The invention relates to a pressure compensation valve and a load sensory system. The pressure compensation valve comprises a valve body and a pressure compensation valve element arranged in the valve body and further comprises a one-way valve, wherein the valve body is provided with an oil inlet cavity, a pressure control cavity, a load sensory cavity and a load control cavity, the oil inlet cavity is communicated with one control end of the pressure compensation valve element through an oil channel with a damping hole, the pressure control cavity and the load control cavity are communicated with an oil inlet and an oil return opening of the one-way valve respectively, the load sensory cavity is communicated with the other control end of the pressure compensation valve element through an oil channel with a damping hole, and pressure oil input from the oil inlet cavity passes through the pressure compensation valve element and then is output from the pressure control cavity. Due to the one-way valve arranged between the pressure control cavity and the load control cavity, pressure signals of a high-load work link cannot be transmitted to the pressure control cavity of the pressure compensation valve on a low-load work link inversely, and accordingly the pressure difference of the two ends of the pressure compensation valve is stabilized, it is guaranteed that the compensation function of the pressure compensation valve is stable, and fluctuation is reduced.

Description

Technical field [0001] The invention relates to the field of engineering machinery, in particular to a pressure compensation valve and a load sensing system. Background technique [0002] In the current load-sensing system, the pressure compensation valve is usually used to balance the load, so that the pressure difference between the inlet and outlet of all valve stems is equal, to ensure that the speed of the actuator is only related to the stroke of the control valve stem, and the operator can easily follow their own wishes To control its compound actions and maintain the independence of each actuator movement. [0003] Existing pressure compensation valves such as figure 1 As shown, usually one end of the spool is in communication with the oil inlet cavity P of the valve body, and the other end is in communication with the load feedback pressure oil Ls, and the balanced load function of the pressure compensation valve is to feed back the pressure signal of the higher load worki...

AI Technical Summary

Problems solved by technology

[0004] Although the current structure of the pressure compensation valve can balance the load, when there is a large change in the load during the compound action, there will be fluctuations in the compensation valve, resulting in large fluctuations in the actuator and poor stability.

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