Relay and booster valves for air brake systems

Details Relay and booster valves for air brake systems Relay and booster valves for air brake systems

1987-06-05

1989-08-15

Reger, Duane A.

Fluid-pressure and analogous brake systems

Automatic

Application valve

303 7, B60T 1112

Patent

active

048568511

ABSTRACT:
The relay valve employs a body preferably of metal defining a central exhaust port and a pair of delivery ports on the bottom of the valve body as well as a supply port on the side thereof. The body defines a cylinder in which a spool or shuttle moves toward and away from the exhaust port. A cover seals the upper open end of the body and defines a second cylinder in which a large piston moves from an upward, non operative position to a lower, operated position in engagement with the spool. The cover includes a control line port through which control pressure is applied to the valve. Service brake delivery pressure for the brake system is available at the supply port of the relay valve and sealed from the two or more delivery ports by a pair of O rings sealing the spool to shuttle in the body. The spool is displaced downward by the piston and opens communication between the supply port and its pressure surrounding the spool or shuttle and the delivery port by grooves in the intermediate section of the spool cylinder.

REFERENCES:
patent: 3411836 (1968-11-01), Dobrikin et al.
patent: 4078844 (1978-03-01), Richmond et al.

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