Flow control valve for engine cooling water
AssigneeDenso Corporation
InventorsYuichiro Miura, Shinji Ishida, Akira Furukawa, Douji Imai
Life of this patent
Estimating the term…
Abstract
A flow control valve comprises a first valve for controlling a radiator flow amount and a second valve for controlling a bypass flow amount. Pressure adjusting passages are respectively provided for the first and second valves for communicating spaces formed at both sides of the respective valves to equalize fluid pressures at both sides, so that a pressure load in an axial direction to the respective valves can be eliminated. As a result, a driving force of an actuator of the flow control valve for directly or indirectly driving the first and second valves can be reduced.
Claims12
A flow control valve of engine cooling water for a vehicle comprising:
- a valve housing having a first inlet port to be connected to a radiator, a second inlet port to be connected to a bypass passage and an outlet port to be connected to a water pump, the valve housing further having a first valve passage forming a part of a radiator cooling circuit in which the engine cooling water is circulated from the an engine to the water pump through the radiator, the valve housing further having a second valve passage forming a part of a bypass circuit in which the engine cooling water is circulated from the engine to the water pump through the bypass passage bypassing the radiator;
- an actuator for generating a driving force in accordance with an operational condition of the engine;
- a first valve movably housed in the valve housing and moved in its axial direction upon operatively receiving the driving force from the actuator, so that an opening degree of the first valve passage is controlled;
- a second valve movably housed in the valve housing and moved in its axial direction upon operatively receiving the driving force from the actuator, so that an opening degree of the second valve passage is controlled;
- and
- a pressure adjusting passage for equalizing fluid pressures at both axial sides of at least one of the first and the second valves.
Dependencies are inferred from the claim text.