| 摘要 |
A control valve assembly for a vehicle braking system, comprises a valve controlling communication between an inlet and an outlet, the valve having a valve seat carried by a control piston and an inertia-responsive member, preferably a ball, movable into engagement with the valve seat to close the valve at a predetermined deceleration of the vehicle. A disabling device is provided which is operable in response to the pressure at the outlet to hold the valve open. The disabling device comprises an auxiliary piston which is biased to an inoperative position and is movable, in response to a predetermined outlet pressure, against the biasing force to hold the ball off its valve seat. |
