VALVE ASSEMBLY

摘要

A valve assembly (10) including 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) which connect the main chamber (30) with the exterior of the housing (24), the valve assembly (10) further including a second movable member (32) which has a first valve part (34) and a second valve part (36) and which is movable parallel to an axis of the valve assembly to engage the first valve part (34) with a corresponding inlet valve part (12a) secured relative to the housing (24), engagement of the first valve part (34) with the inlet valve part (12a) substantially preventing flow of fluid into the main chamber (30) via the inlet port (12), the first movable member (26) being provided with an exhaust valve part (26c) and movable so that the exhaust valve part (26c) engages with the second valve part (36) of the second movable member (32), engagement of the exhaust valve part (26c) with the second valve part (36) substantially preventing flow of pressurised fluid out of the main chamber (30) via the exhaust port (16), characterised in that the valve assembly (10) is further provided with a support part (46a) which is secured relative to the housing (24), there being a first seal between the second movable member (32) and the support part (46a) and a second seal between the support part (46a) and the first movable member (26).