Two position two-way plug-in valve type high and low pressure switching valve

The utility model relates to a high-low change-over valve with bi-stable and bi-pass cartridge valve, comprising six cartridge valves and a directional selecting valve, the control ports of the cartridge valves V , V , V are connected with each other and the directional selecting valve A, P of the directional selecting valve is used as a state control port of the change-over valve, the control ports of the cartridge valves V , V , V are connected with each other and the directional selecting valve B, T of the directional selecting valve is used as an oil return port of the change-over valve, the A1 port and the A4 port of V and V are connected with each other used as an interface with outside, the B3 port and the B6 port of V and V are connected with each other used as another interface with outside, the B1 port of V and the A2 port of V are connected with each other used as an oil-out port of the change-over valve, the A3 port of V and the B2 port of V are connected with each other used as another oil-out port of the change-over valve, the B4 port of V and the A5 port of V are connected with each other used as an oil-out port of the change-over valve, the A6 port of V and the B5 port of V are connected with each other used as an oil-out port of the change-over valve, the hand handle of the directional selecting valve is used as a pilot control valve of the change-over valve. The utility model has compact and reasonable structure, and long operating life.