Modular control valve

Details Modular control valve Modular control valve

1980-02-25

1982-05-18

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 50, 303 71, B60T 1504

Patent

active

043301576

ABSTRACT:
A braking system for a tractor-trailer combination vehicle having air brakes includes a two plunger control valve in which one of the plungers controls the brakes on the tractor and the other plunger controls the brakes on the trailer. However, the valve is designed such that actuation of the plunger controlling the brakes on the tractor to a condition effecting an application of the spring brakes on the tractor automatically actuates the other plunger to effect an automatic actuation of the spring brakes on the trailer. Operation of the plunger controlling the trailer brakes is independent of the plunger controlling the tractor brakes, so that application of the trailer spring brakes may be effected without applying the tractor spring brakes. The tractor spring brakes may be released with the trailer brakes applied to permit bobtail tractor operation or permit the trailer to be parked with the tractor spring brakes released.

REFERENCES:
patent: 4163584 (1979-08-01), Koenig
patent: 4232908 (1980-11-01), Stearns

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