Continual quick service valve device with fast charging means

Details Continual quick service valve device with fast charging means Continual quick service valve device with fast charging means

1975-12-22

1976-10-26

Reger, Duane A.

Fluid-pressure and analogous brake systems

Releasing

Control pipe

303 38, B60T 1542

Patent

active

039880443

ABSTRACT:
This invention relates to a cycling-type continual quick service valve device which embodies therein a quick service valve means that comprises two valves each operatively connected to an abutment subject to fluid under pressure supplied from a train brake pipe through a first restriction to a chamber on one side thereof and subject to fluid under pressure supplied from the brake pipe to a chamber at the opposite side and to a quick service chamber via two restrictions arranged in parallel and in series with a third restriction, the sizes of these three restrictions being such that the rate of flow of fluid under pressure therethrough is less than the rate of flow through the first restriction. A check valve is arranged in series with one of the two parallel arranged restrictions so as to prevent flow therethrough in the direction from the chamber at the opposite side of the abutment to the brake pipe. Upon a service rate of reduction of pressure in the train brake pipe effected independently of this valve device, the pressure in the chamber at the one side of the abutment is reduced via the first restriction at a more rapid rate than the pressure can be reduced in the chamber at the opposite side of this abutment via the third restriction and the other one of the two parallel arranged restrictions.

REFERENCES:
patent: 2016411 (1935-10-01), Cook
patent: 2137018 (1938-11-01), Hewitt
patent: 3175871 (1965-03-01), Wilson
patent: 3240540 (1966-03-01), McClure

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