US Patent 7254945 Operate check valve and hydraulic driving unit

An operate check valve saves space and performs multiple functions by absorbing and integrating a switching valve. A switching valve for controlling the flow of a hydraulic fluid in both normal and reverse directions is coaxially contained with a check valve in a space inside a valve containing housing between a hydraulic pump and a tank for storing the hydraulic fluid. Check valves are located opposite one another on either side of the switching valve, with the switching valve integrated into the operate check valve.