Fluid-pressure and analogous brake systems – Releasing – Motor
Reexamination Certificate
2007-12-11
2007-12-11
Nguyen, Xuan Lan (Department: 3683)
Fluid-pressure and analogous brake systems
Releasing
Motor
C303S036000
Reexamination Certificate
active
10453130
ABSTRACT:
A release graduating valve for freight brake control is provided for a railcar having a pneumatic control valve, emergency and auxiliary reservoirs each normally charged with pressurized fluid from a brake pipe and a fluid pressure activated brake cylinder device for applying the brakes on the railcar. A selectively operable release graduating valve can include a graduated release valve and a changeover valve which selectively interposes the graduated release valve to exhaust brake cylinder pressure in a graduated manner responsive to brake pipe pressure. Alternatively, the changeover valve can isolate the graduated release valve and direct the pneumatic control valve to exhaust brake cylinder pressure in a conventional manner. The changeover valve can be operated responsive to the pressure in an air pipe supplied with pressurized fluid from a remote source. A permanent release graduating valve can be provided wherein the changeover valve is omitted, in which case the brake cylinder exhaust is always controlled by the graduated release valve. Either configuration of the release graduating valve could be also be utilized in an ECP freight brake control system.
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Engle Thomas
Hart James
Buchanan & Ingersoll & Rooney PC
Nguyen Xuan Lan
Westinghouse Air Brake Technologies Corporation
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