| 摘要 |
A valve assembly 10, preferably for a brake modulator, includes a housing 24 and a first movable member 26 which divides the housing into a control chamber 22 and a main chamber 30, the housing 24 being provided with an inlet port 12, a delivery port 14 and an exhaust port 16. A second movable member 32 is movable parallel to an axis of the valve assembly to substantially preventing flow of fluid into the main chamber 30 via the inlet port 12, the first movable member 26 being movable so that an exhaust valve part 26c engages with a second valve part 36 of the second movable member 32 substantially preventing flow of pressurised fluid out of the main chamber 30 via the exhaust port 16. The valve assembly having a support part 46a secured relative to the housing 24, there being a seal between the support part 46a and the first movable member 26 and a seal between the support part 46a and the second movable member 32. The seals allowing a 1:1 ratio between the pressures of the control chamber and the main chamber when the valve is in a hold condition. |
