Graduated release/proportioning valve

Details Graduated release/proportioning valve Graduated release/proportioning valve

2005-12-06

2005-12-06

Butler, Douglas C. (Department: 3683)

Fluid-pressure and analogous brake systems

Load control

Empty and load type

C303S074000

Reexamination Certificate

active

06971723

ABSTRACT:
A release graduating proportioning valve for a rail car brake system having a brake pipe, a brake cylinder, and a load sensor valve. The release graduating proportioning valve has a conventional proportioning piston with a control volume communicating on a first side thereof and a second volume communicating on an opposite side thereof. A graduated release valve member, which can be incorporated into the top of the proportioning valve, is interposed between the control volume and atmosphere for providing a graduated release of brake cylinder pressure via the control volume. The graduated release valve member is activated by movement of the proportioning piston.

REFERENCES:
patent: 4080005 (1978-03-01), Engle
patent: 5303987 (1994-04-01), McKay
Wabco Parts Catalog, “P-1 Load Proportional Valve,” 3229-50, Apr., 1987, pp. 1-4.
Wabco Parts Catalog, “S-1 Load Sensor Valve,” 3229-25, Sup. 10, Dec., 1979.

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