| 摘要 |
PURPOSE: To make it possible to prevent pressure variation and obtain the desired output pressure by connecting two orifices in series between two-position flow compensating valve and a sump or an opening of a variable displacement pump. CONSTITUTION: When the pressure within the pump output line increases, a control valve 26 moves to the second position and connects the pump outlet line 20 to the main orifice line 30. At that time as the check valve 48 is closed, the pressure is slowly transmitted to the control line 44 passing only an orifice 38. Thereby, the pressure within the control line 44 is gradually increased with the leak into the sump 16 being regulated by an orifice 40 causing the output of a pump 10 to be gradually reduced. As this movement is relatively slowly generated, the time necessary for the feedback of the fluid passing the load sensing line 24 can be secured and the pump 10 can be controlled within the vicinity of the desired output pressure without variations. |
