Pressure Compensation Valves and Load Sensing Systems

A pressure compensation and load-sensing technology, which is applied in fluid pressure actuators, servo motor components, mechanical equipment, etc., can solve problems such as compensation valve fluctuations, poor stability, and large fluctuations in actuators, and achieve stable compensation functions and reduced The effect of small fluctuations

Active Publication Date: 2016-05-04
XCMG CONSTR MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Pressure Compensation Valves and Load Sensing Systems
  • Pressure Compensation Valves and Load Sensing Systems
  • Pressure Compensation Valves and Load Sensing Systems

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Embodiment Construction

[0021] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0022] Such as figure 2 Shown is a schematic diagram of the hydraulic principle of an embodiment of the pressure compensation valve of the present invention. In this embodiment, the pressure compensating valve includes a valve body, a pressure compensating spool and a one-way valve arranged inside the valve body, and the valve body has an oil inlet chamber P, a pressure control chamber Pc, a load sensing chamber Ls and a load control chamber Lc , the oil inlet chamber P communicates with a control end of the pressure compensation spool through an oil passage with a damping hole, the pressure control chamber Lc and the load control chamber Pc communicate with the oil inlet and oil return port of the check valve respectively, and the load is sensitive The chamber Ls communicates with the other control end of the pressu...

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PUM

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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, so that the speed of the actuator is only related to the stroke of the operating valve stem, and the operator can easily adjust the pressure according to his own wishes. To control its compound action and maintain the independence of each actuator movement. [0003] Existing pressure compensating valves such as figure 1 As shown, usually, one end of the spool communicates with the oil inlet chamber P of the valve body, and the other end communicates with the load feedback pressure oil Ls, and the load balancing function of the pressure compensation valve is to feed back the pressure signal of the w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B13/02
CPCF15B13/026F15B13/0407
Inventor 景军清邢红兵翟海燕李水聪薛源
Owner XCMG CONSTR MACHINERY
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