| 摘要 |
PURPOSE:To reduce loss by allowing one discharge port of the selector valve installed on the discharged oil passage of an auxiliary pump to communicate to the main circuit through a check valve and allowing the other discharge port to communicate to the second piston. CONSTITUTION:In the second piston 11, an oil passage 11' is formed, and in a casing 12, the oil passage 12' which communicates to the oil passage 11' and is opened outside is formed. One discharge port of the selector valve 8 installed on the discharged oil passage of an auxiliary pump 6 communicates to the main circuit 2 through a check valve 13, and the other discharge port communicates to the piston 11. Therefore, the control pressure can be set at the necessary limit, and the necessity to install the pressure setting valve for the auxiliary pump 6 is eliminated, and less can be reduced, and cost can be reduced. |
