Proportioning control valve with spring biased control piston

Details Proportioning control valve with spring biased control piston Proportioning control valve with spring biased control piston

1987-09-11

1988-07-19

Reger, Duane A.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

303 966, 303 972, B60T 1112

Patent

active

047580518

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 proportionally lower pressure level at the outlet of the valve. When the pressure level at the control port exceeds a predetermined level established by a spring, 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.

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