Patent ID: 9400002
Filing Date: 2016-07-26
CPC Classification: B66F,F15B,Y10T

Claim Text:
1. A load sensing electric-proportional multi-way valve, comprising a dynamic load sensing pressure compensation valve, a first safety valve and a first pressure compensated flow regulating valve, wherein the dynamic load sensing pressure compensation valve has a first oil inlet port connecting a first gear pump, a first oil outlet port connecting a port of a redirector, and a second oil outlet port connecting a main oil passage of the multi-way valve, a signal oil port of the dynamic load sensing pressure compensation valve is connected with both a load sensing port of the redirector and a second oil inlet port of the first safety valve; a third oil outlet port of the first safety valve is connected with a first oil return port of the dynamic load sensing pressure compensation valve; the main oil passage is connected sequentially with a lifting loop and a first hydraulic one-way valve, a fourth oil outlet port of the hydraulic one-way valve being respectively connected with a lifting oil port and a lowering loop in which a fifth oil outlet port of the lowering loop is connected with a second oil return port, the main oil passage is connected respectively with an inclining union and an at least one attachment union via a first electric-proportional pressure compensated flow control valve, and is connected with the second oil return port via a logic direction valve; a first oil discharge port of the lifting loop is connected sequentially with a hydraulic one-way valve and a proportional motor-driven overflow valve in which a sixth oil outlet port of the proportional motor-driven overflow valve is connected with the second oil return port, and is connected with the second oil return port via a second pressure compensated flow regulating valve; a second oil discharge port of the first electric-proportional pressure compensated flow control valve is connected with the second oil return port via the proportional motor-driven overflow valve, and is connected with the second oil return port via the pressure compensated flow regulating valve; an oil inlet port of the logic direction valve connected with the main oil passage is connected with an oil inlet port of the proportional motor-driven overflow valve via a second hydraulic one-way valve, and is connected with the first oil return port of the the dynamic load sensing pressure compensation valve via a two-way solenoid valve; an oil inlet port of the first pressure compensated flow regulating valve is connected with a second gear pump, and a seventh oil outlet port of the first pressure compensated flow regulating valve is connected with an inlet port of a braking valve, and an eighth oil outlet port of the first pressure compensated flow regulating valve is connected with the main oil passage via a second hydraulic one-way valve, and is connected with the second oil return port via a two-way hydraulic control directional valve, a first control oil port of the two-way hydraulic control directional valve is connected with a third oil discharge port of the lifting loop.