| 摘要 |
PURPOSE:To provide smooth flow control for a pump with a simple construction by introducing the pilot pressure, which is generated between a throttle valve and the secondary port of relief valve for restriction of the pump delivery pressure, to a regulator of the pump via another throttle valve. CONSTITUTION:The secondary port of a relief valve 11 for restriction of the delivery pressure of a variable delivery pump 1 is connected to a tank 9 through a throttle valve 7, and the pressure upstream this throttle valve 7 is introduced to a regulator 2 of said pump 1 as the pilot pressure. In this circuit, a throttle valve 13 is interposed in the line introducing the pilot pressure to regulator 2. A point between this throttle valve 13 and the regulator 2 is connected to the abovementioned tank 9 through a divergent line 15 equipped with a third throttle valve 14. Thereby the pulsation of the pilot pressure is lessened by the throttling resistance of the throttle valve 13, which will further be lessened by the throttling resistance of the throttle valve 14. |
