BRAKE PRESSURE PROPORTIONING VALVE WITH AN ADDITIONAL VALVE

摘要

The vehicle brake pressure proportioning valve subject to the load of a vehicle and controlled fluidically comprises a piston (18) sliding in a stepped bore made in a body and carrying a normally open shutter arranged between a source of fluid under pressure and an associated brake circuit, the piston (18) being movable counter to a spring under the effect of the pressure of the fluid which tends to close the shutter, and comprising furthermore a sealed control chamber (16) connected to a load sensor (10). The proportioning valve further comprises a normally open additional valve (14) arranged between the chamber (16) and the sensor (10), in order to interrupt communication between the chamber (16) and the sensor (10) during a braking operation.