Primary and secondary pressure-balanced proportioning valve

Details Primary and secondary pressure-balanced proportioning valve Primary and secondary pressure-balanced proportioning valve

1988-11-03

1990-05-29

Garrett, Robert E.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 975, B60T 1120

Patent

active

049290339

ABSTRACT:
The proportioning valve assembly (40, 140) may be screwed into a complementary-shaped opening in a master cylinder (10). The valve assembly (40, 140) includes a differential area piston (50, 150) biased by a spring (70, 170) toward the outlet (21, 121) which communicates with the rear brakes. The master cylinder (10) includes a pair of passageways (16, 18) which communicate primary fluid pressure and secondary fluid pressure directly to the differential area piston (50, 150) of the proportioning valve assembly (40, 140) to displace the piston (50, 150) to a balanced position. If there is a failure of pressure in the primary brake circuit, the proportioning valve assembly (40, 140) actuates the differential area piston (50, 150) to permit fluid flow to bypass the piston (50, 150) and be communicated directly to the rear brakes of the vehicle.

REFERENCES:
patent: 3597008 (1971-08-01), Falk
patent: 3608977 (1971-09-01), Kerstling
patent: 3614169 (1971-10-01), Bueler
patent: 3669506 (1972-06-01), Papin et al.

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