The invention relates to a multiple directional control valve
system for return oil
throttle control with load sensitive pressure compensation, in particular to a multiple directional control valve
system apparatus for the return oil
throttle control with load sensitive pressure compensation for excavators. In the
system, a filter is communicated with a
throttle valve communicated with a pressure reducing valve, the pressure reducing valve is communicated with a load sensor port, two ends of the control valve are respectively connected with a first control port or second control port, the load sensor port is communicated with a one-way valve communicated with a pressure compensator, and the pressure compensator is communicated with the control valve. The outlet of a load sensitive variable pump is respectively communicated with a flow control valve, a pressure stop valve, a power adjusting valve and a variable oil cylinder, the flow control valve is communicated with the variable oil cylinder and the load sensor port, and rod cavities of the first and second variable oil cylinder are respectively connected with a
swash plate of the load sensitive variable pump. The invention has the advantages of simple structure, improved accuracy of operation, high control degree and reliability and is widely used for hydraulic multiple-way valve systems of the
engineering machinery industry.