Load sensitive pressure compensation multiway valve for excavator

Abstract

The invention discloses a load sensitive pressure compensation multiway valve for an excavator, which includes a valve body, nine operating valves sequentially arranged on the valve body, as well as an oil inlet and an oil return opening arranged at the left end of the valve body, wherein oil inlets are arranged on the nine operating valves respectively; the valve body adopts an integral structure formed by integral casting; an oil inlet channel and an oil return channel are arranged inside the valve body; valve rods are arranged inside the valve body; pilot valves are arranged at the two ends of the valve rods respectively; and a flow control valve, a load feedback valve, a safety valve, a pressure compensation valve, an oil filling valve, an overload overflow valve and a one-way inlet valve which correspond to all the operating valves as well as connecting oil chambers among all the operating valves are arranged on the valve body. The load sensitive pressure compensation multiway valve has the advantages of low cost, compact structure, low pressure loss, excellent flow control property during operation, and the realization of functions of flow control, pressure compensation, automatic oil filling, safety protection and the like.

Description

technical field [0001] The invention belongs to the technical field of hydraulic control valves, in particular to an excavator load-sensitive pressure compensation multi-way valve in a hydraulic system. Background technique [0002] The multi-way valve is the core component in the hydraulic system of the excavator, which is used to operate and control the movement of various parts of the excavator. Therefore, the performance of the multi-way valve is related to various operations and controls of the excavator, and directly affects the technical performance of the excavator. The existing multi-way valve usually adopts a superimposed structure, that is, multiple valve plates are connected in parallel to form a multi-way valve with general functions, and it is remanufactured from ordinary valve plates, which has a large volume and high manufacturing cost. At present, the ZL20-100 multi-way valve of a superimposed small excavator used in China is composed of an oil inlet valve,...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a load-sensitive pressure compensation multi-way valve for excavators, which overcomes the shortcomings of existing products such as large volume, high manufacturing cost, no flow control and pressure compensation, etc., and the integrated structure has low cost. Compact, less pressure loss, good flow control performance during operation, and a variety of operating valves are added to realize the functions of flow control, pressure compensation, automatic oil replenishment, safety protection, etc.

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