| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a liquid pressure valve device in which a hydraulic fluid flowing between each valve element and valve seat of a booster valve and a pressure reducing valve flows in a valve opening direction. <P>SOLUTION: The liquid pressure valve device includes: (a) a housing having a low-pressure chamber 272, a pressure regulating chamber 254, a high-pressure chamber 256 positioned between the low-pressure chamber and the pressure regulating chamber, a first inter-chamber part which connects the low pressure chamber and high-pressure chamber, and a second inter-chamber part which connects the high-pressure chamber and pressure regulating chamber; (b) a moving member 196, which plugs the first inter-chamber part and is movable in an inserted state into the second inter-chamber part; (c) a communication passage 260, which opens to the low-pressure chamber and formed on the moving member, has a low-pressure chamber side opening which functions as a valve seat of the pressure reducing valve, and communicates the low-pressure chamber with the pressure regulating chamber; and (d) a plunger 192 which functions as a valve element of the pressure reducing valve which can seat on the low-pressure chamber side opening. In this device, the opening to the pressure regulating chamber of the second inter-chamber part is made to function as a valve seat, and a part in the pressure regulating chamber of the moving member as a valve element of the booster valve. This structure enables the hydraulic fluid to flow in the valve opening direction when pressure is boosted and reduced. <P>COPYRIGHT: (C)2012,JPO&INPIT |
