| 摘要 |
PURPOSE:To facilitate the adjustment of a flow characteristic by forming a first valve seat at an outflow passage, a second valve seat at a main outflow passage, and a first and a second valve parts, forming pairs with the first and second valve seats, at a driver, and controlling the flow rate of a fluid to the main and auxiliary outflow passages. CONSTITUTION:When an engine is cooled, a valve body 19 is moved upward by a stepping motor, so that a main valve 24, a pressure control valve 27 and an auxiliary valve 29 are placed in the opened state. The outflow quantity, flowing from outlets 14, 17, of sucked air flowing into a valve chamber 5 thereby becomes the maximum outflow quantity determined by orifices 13, 16, and the total outflow quantity also becomes the maximum. When the engine starts warming up, the opening of the valves 24, 27, 29 is reduced, and the outflow quantity from the outlet 17 is determined by the clearance area of the auxiliary valve 29, and the total outflow quantity is reduced only by the reduced quantity part of the outlet 17. When the engine is warmed, the auxiliary valve 29 is closed, the difference between the valve chamber 5 and the outlet 17 is reduced by the pressure control valve 27, and the total outflow quantity is controlled by the main valve 24. In the case of not needing auxiliary air, the main valve 24 is closed to cut off outflow to the outlets 14, 17. An outflow characteristic can be thereby adjusted easily. |
