Vehicle anti-skid air braking systems

Details Vehicle anti-skid air braking systems Vehicle anti-skid air braking systems

1986-03-13

1987-09-29

Reger, Duane A.

Fluid-pressure and analogous brake systems

Pipeless valves

303 84R, B60T 1134

Patent

active

046965211

ABSTRACT:
A trailer air braking system has combined spring brake and service brake actuators, and the service brake chambers of the actuators are controlled by a combined emergency relay and modulator valve assembly of known construction. In order to ensure that the spring brake function does not become operative due to a moderate loss in the pressure of the trailer reservoir, such as would occur in the event of an anti-skid test in which the reservoir is isolated from the emergency line and the modulator valve is cycled, a spring brake one-way control valve is inserted into the spring brake circuit leading from the reservoir. The control valve acts in one condition as a one-way valve to prevent air returning from the spring brake actuator chamber to the reservoir, but on a large loss in reservoir pressure, a piston which carries the one-way valve seat and is subjected to reservoir pressure moves under spring biassing such that the one-way poppet valve member is unseated by a control pin to permit a reduction in spring brake pressure.

REFERENCES:
patent: 4191428 (1980-03-01), Durling

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