| 摘要 |
A hydraulic pressure control valve assembly in a hydraulic brake system on a powered and wheeled vehicle having a self-contained hydraulic pressure source, preferably in the form of a pressure accumulator, said assembly being characterized by that the assembly is formed with a hydraulic pressure chamber and a slidable piston in the latter, an axial bore is formed through said piston, an elongated valve slide is slidably mounted in said axial bore, a valve part is formed on said valve slide, said valve part is so designed and arranged that the hydraulic live pressure coming from said pressure source may be applied on the both sides of said valve part when the latter is receded from a mating valve seat for practically balancing out the effect of said live pressure upon said valve part under occasional demand, said axial bore being provided in the hydraulic system extending from said pressure source and a reservoir and said valve being adapted for interruption of said hydraulic system when a manually operated braking member is actuated in its brake applying sense.
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