A valve assembly comprising an inner housing in which is provided a first port, a second port, and a third port, and a valve member assembly which is movable between a first position, a second position, and a third position. An outer housing is separate from and encloses at least part of the inner h
A valve assembly comprising an inner housing in which is provided a first port, a second port, and a third port, and a valve member assembly which is movable between a first position, a second position, and a third position. An outer housing is separate from and encloses at least part of the inner housing, the outer housing having a first port and a second port, the Inner housing and outer housing each being provided with first mating parts, which engage to provide a substantially fluid tight seal while enclosing a conduit for fluid communication between the first port of the inner housing and the first port of the outer housing, and second mating parts, which engage to provide a substantially fluid tight seal while enclosing a conduit for fluid communication between the second port of the Inner housing and the second port of the outer housing.
대표청구항▼
1. A valve assembly comprising an inner housing in which is provided a first port, a second port, and a third port, there being located within the inner housing a valve member assembly which is movable between a first position in which the second port is connected to the third port whilst the first
1. A valve assembly comprising an inner housing in which is provided a first port, a second port, and a third port, there being located within the inner housing a valve member assembly which is movable between a first position in which the second port is connected to the third port whilst the first port is closed by the valve member assembly, a second position in which the first port is connected to the second port whilst the third port is closed by the valve member assembly, and a third position in which at least two of the first, second and third ports are closed by the valve member assembly, wherein the valve assembly further comprises an outer housing which is separate from and encloses at least part of the inner housing, the outer housing having a first port and a second port, the inner housing and outer housing each being provided with first mating parts, which engage to provide a substantially fluid tight seal between the inner housing and the outer housing whilst enclosing a conduit for fluid communication between the first port of the inner housing and the first port of the outer housing, and second mating parts, which engage to provide a substantially fluid tight seal between the inner housing and the outer housing whilst enclosing a conduit for fluid communication between the second port of the inner housing and the second port of the outer housing. 2. A valve assembly according to claim 1 wherein the inner housing is provided with a fourth port flow which is connected to the valve member assembly such that the pressure of fluid at the fourth port controls movement of the valve member assembly between the first position, second position and the third position. 3. A valve assembly according to claim 2 wherein the outer housing is also provided with a third port and a third mating part which engage with the third mating part of the inner housing to provide a substantially fluid tight seal between the inner housing and the outer housing whilst enclosing a conduit for fluid communication between the fourth port of the inner housing and the third port of the outer housing. 4. A valve assembly according to claim 3 wherein the inner housing encloses a volume and the valve member assembly includes a movable element which divides the volume enclosed by the inner housing into a control chamber and a main chamber, the first, second and third ports extending into the main chamber, and the fourth port extending into the control chamber. 5. A valve assembly according to claim 3 wherein the first port and the fourth port are provided in the same side of the inner housing. 6. A valve assembly according to claim 5 wherein the fourth port in the inner housing comprises a generally annular aperture in the inner housing which surrounds and is substantially coaxial with the first port. 7. A valve assembly according to claim 4, wherein the inner housing is provided with a fifth port which is connected to the control chamber, and the outer housing is also provided with a fourth port and a fourth mating part which engages with a fourth mating part of the inner housing to provide a substantially fluid tight seal between the inner housing and the outer housing whilst enclosing a conduit for fluid communication between the fifth port of the inner housing and the fourth port of the outer housing. 8. A valve assembly according to claim 7 wherein the first port, the fourth port and the fifth port are provided in the same side of the inner housing. 9. A valve assembly according to claim 1 wherein the outer housing is provided with a plurality of ports in fluid communication with the second port of the inner housing. 10. A valve assembly according to claim 4 wherein the valve assembly further includes at least one electrically operated valve which controls flow of fluid into and out of the control chamber. 11. A valve assembly according to claim 10 wherein the outer housing is formed in two parts, the ports being provided in a first part of the outer housing, and electrical control components by means of which operation of the at least one electrically operated valve may be effected being mounted on the second part. 12. A valve assembly according to claim 1 wherein the outer housing may include an aperture which is in fluid communication with the third port of the inner housing. 13. A valve assembly according to claim 12 wherein the outer housing supports a valve member which is adapted to restrict flow of fluid through the third port of the inner housing into the inner housing. 14. A valve assembly according to claim 1 wherein the inner housing is placed in the outer housing by translational movement in a first direction, and the inner housing is secured relative to the outer housing by a locking means which comprises a locking part which engages with the surface of one or both of the inner housing and outer housing to prevent separation of the inner housing and outer housing, release of the locking means to permit separation of the inner housing and outer housing being achieved by sliding the locking part along said surface in a second direction generally perpendicular to the said first direction. 15. A valve assembly according to claim 14 wherein the inner housing is secured relative to the outer housing by means of a bayonet connection. 16. A valve assembly according to claim 15 wherein the inner housing is provided with a male bayonet connector formation which is located in a corresponding recess provided in the outer housing. 17. A valve assembly according to claim 14 wherein the inner housing is secured relative to the outer housing by means of a slide lock.
Ronnhult John Fritiof (Sodertalje SW) Estmar Ernst Goran (Sodertalje SW) Petersen Bjarne Louis (Jarna SW), Valve unit for braking pressure control in wheeled vehicles.
Maddrick Bernard D. (Bristol GB2), Variable pressure ratio valve for vehicle braking system having double valve assembly set as function of vehicle load.
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