Trailer control valve device for the trailer brakes of a tractor

Fluid-pressure and analogous brake systems – Automatic – Application valve

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Details

303 7, 303 35, 303118, B60T 1502

Patent

active

047861169

ABSTRACT:
A brake pressure control valve for regulating the braking pressure in the trailer brake system of a tractor-trailer vehicle, so as to develop the trailer brake pressure to a preset level ahead of the braking pressure in the tractor brake system during a pilot phase of brake operation. The preset level of this advance trailer brake pressure can be selected by an adjustable member that forms a part of the auxiliary valving that controls the point at which the pilot phase of operation is terminated. A limit stop is cooperatively arranged with this adjustable member in order to provide a means for limiting the point beyond which the auxiliary valving is activated, to thereby prevent the advance trailer brake pressure from exceeding a specified safe maximum value.

REFERENCES:
patent: 3934942 (1976-01-01), Klimek
patent: 4493510 (1985-06-01), Deike et al.
patent: 4575157 (1986-03-01), Reinecke
patent: 4609230 (1986-09-01), McCann

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