| 摘要 |
A levelling valve for use in a vehicle suspension system, said valve comprising a lever adapted to be connected at one end to the vehicle axle or to a suspension member and pivotally mounted at the other end on the body of said valve, a shaft rotatable in response to movement by said lever, an operating member connected to said shaft and adapted to act on a piston in response to rotational movement of said shaft, said piston being provided with a groove or slot in which the operating member is received, a cylinder filled with damping fluid and housing said piston, and a valve spindle movable in response to movement of said piston to connect one or more suspension units of the vehicle to a source of fluid pressure or to exhaust depending on the direction of movement of the spindle and hence the lever, wherein the piston is normally located in central position in the cylinder and is movable towards one end or other of the cylinder when the lever moves, the movement of the piston towards the ends of the cylinder being damped and means being provided to allow undamped return of the piston to the central position in the cylinder.
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