| 摘要 |
PURPOSE:To simplify a piping between a tank and a hydraulic pump by directly connecting a return pipe from a flow control valve to a suction pipe for connecting the tank to the hydraulic pump and returning the oil pressure to the suction pipe. CONSTITUTION:A return pipe 14 for connecting the pipe joint 19 to a flow control valve 9 is connected to another connecting part of the pipe joint 19 and when the cage of an elevator goes up or down, a part of the whole of the operating oil is returned to a suction pipe 12. Therefore, when the cage goes up, the pressurized oil from a hydraulic pump 10 reaches through a feed-out pipe 13 to the flow control valve 9 and the pressurized oil is introduced to a supply and discharge pipe 8 in accordance with the rising condition of the cage. On the other hand, the excessive pressurized oil is returned through the return pipe 14 to the suction pipe 12. Therefore, the piping between the oil pressure pump 10 and tank 6 can be simplified. |
