Working joint valve body structure and proportional multi-way valve

Abstract

The invention relates to a working joint valve body structure and a proportional multi-way valve. The working joint valve body structure includes a working joint valve body body, a main reversing valve and a pressure compensation valve arranged in the valve body body. The compensation valve performs pre-valve compensation for the main reversing valve. The valve body has an oil inlet port, an oil return port and two load oil ports. It is characterized in that it also includes a first shuttle valve. The two oil inlets of the first shuttle valve respectively receive the input of the load pressure of the two load oil ports of the valve body when the working union is in working state, and the oil outlet of the first shuttle valve will The screened load pressure is output to the spring-side control chamber of the pressure compensation valve. Compared with the existing way of outputting the load working pressure through different matching positions of the spool and the valve body, the screening structure of the load pressure of the first shuttle valve adopted in the present invention can simplify the structure of the spool and the valve body and reduce the processing cost. difficulty.

Description

technical field [0001] The invention relates to the field of hydraulic control, in particular to a working joint valve body structure and a proportional multi-way valve. Background technique [0002] The proportional multi-way valve is the core component of the construction machinery hydraulic system, located between the pump and the actuator. In the proportional multi-way valve, manual control or proportional electromagnet electro-hydraulic control is often used to change the stroke of the spool proportionally so as to accurately control the flow of the system. For the load sensitive 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, and the flow rate of the working link of the proportional multi-way valve is only related to the stroke of the control valve stem, which is easy to operate Control its composite actions according to your own wishes, and keep the ...

AI Technical Summary

Problems solved by technology

Although the structure of the pressure compensation valve can balance the load, the load feedback pressure of each connection is fed back to the end of the pressure compensation valve through the different matching positions of the valve core and valve body, which will make the structure of the valve core and valve body very complicated, thereby increasing the difficulty of processing

[0004] In addition, the relief valve in the current proportional multi-way valve usually adopts a cartridge type relief valve installed on the valve body, or realizes the function of the relief valve by installing various parts inside the valve body, and these relief valves exist in the form of The structure is more complex, the installation space is large, and the pressure adjustment is inconvenient.

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