Empty/load changeover valve with a vent passage open in the empt

Details Empty/load changeover valve with a vent passage open in the empt Empty/load changeover valve with a vent passage open in the empt

1991-01-22

1992-03-31

Graham, Matthew C.

Fluid-pressure and analogous brake systems

Load control

Empty and load type

303 226, B60T 818

Patent

active

051002078

ABSTRACT:
A empty/load changeover valve for a railway freight car having a proportioning valve via which the car control valve supplies and releases brake cylinder pressure. The proportioning valve comprises a balance piston having equal opposing pressure areas and a check valve integral therewith, one pressure area of the balance piston being subject to air supplied to the brake cylinder under all conditions of car loading. The opposing pressure area of the balance piston is either pressurized or depressurized depending upon the car being in a "load" condition or an "empty" condition of loading. This provides for a proportional mode of brake control during "empty" braking in which the brake pressure varies with the actual vehicle load. The arrangement prevents car rock and roll from influencing the proportioned brake pressure and makes provision for assuring release of the brakes in bypass of the proportioning valve.

REFERENCES:
patent: 2068342 (1937-01-01), McClure
patent: 3376080 (1968-04-01), Kettering et al.
patent: 3671086 (1972-06-01), Scott
patent: 4080005 (1978-03-01), Engle
patent: 4235477 (1980-11-01), Hart
patent: 4235478 (1980-11-01), Billeter
patent: 4291923 (1981-09-01), Billeter
patent: 4417767 (1983-11-01), Billeter
patent: 5005915 (1991-04-01), Hart et al.

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