| 摘要 |
PROBLEM TO BE SOLVED: To obtain a compact size by suppressing thrust by pressure acting on a valve by the difference between radiator flow pressure and bypass flow pressure and reducing the driving torque of an actuator. SOLUTION: The flow control valve 1 used for an engine cooler comprises a first valve 31 and a first valve seat 35 for controlling a radiator flow returning from the engine to a pump through a radiator, a second valve 32 and a second valve seat 36 for controlling a bypass flow returning from the engine to the pump without passing through the radiator and a step motor 24 for displacing both the valves 31 and 32 integrally as one valve 20. Components such as the first valve 31, the first valve seat 35, the second valve 32 and the second valve seat 36 are set so as to have flow characteristics that the rate of the bypass flow is a little higher than that of the radiator flow in an area where the radiator flow reaches substantially zero, and the rate of the bypass flow is equal or lower than that of the radiator flow in an area except the above area. COPYRIGHT: (C)2004,JPO
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