Proportioning control valve

Details Proportioning control valve Proportioning control valve

1987-05-04

1988-02-16

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 7, 303 40, B60T 1300

Patent

active

047251018

ABSTRACT:
A proportioning control valve for a fluid pressure braking system for a tractor-trailer combination vehicle permits unproportioned communication of control pressure when the tractor is pulling a trailer but proportions communication of control pressure when the tractor is operated without a trailer to establish a proportonally lower pressure level at the outlet of the valve. The control valve, when operating in the proportioning mode, is also responsive to pressure in the brake reservoir. When pressure in the reservoir drops below a predetermined level, the control valve proportions at a rate which increases the pressure level at the outlet at a rate greater than the rate of increase of control pressure until the unproportioned pressure level is attained.

REFERENCES:
patent: 4230373 (1980-10-01), Plantan
patent: 4261624 (1981-04-01), Plantan
patent: 4348062 (1982-09-01), Koenig
patent: 4368926 (1983-01-01), Bartholomew
patent: 4571007 (1986-02-01), Carmichael et al.
patent: 4575157 (1986-03-01), Reinecke
patent: 4640556 (1987-02-01), Fauck et al.

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