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AssigneeWestinghouse Air Brake Technologies Corporation
InventorsJames E. Hart, Thomas Engle
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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.
A graduated release valve for a rail vehicle having a pneumatic control valve, a brake pipe, at least one reservoir charged from said brake pipe, and a brake cylinder, said graduated release valve comprising:
The graduated release valve of 11 wherein said auxiliary reservoir charging check valve is set to permit said pneumatic control valve to go to a release position at a first increase in brake pipe pressure following a brake application.
A graduated release valve for a rail vehicle having a pneumatic control valve, a brake pipe, at least one reservoir charged from said brake pipe, and a brake cylinder device, said release graduating valve comprising a metering valve communicating with said brake cylinder and controlling the exhaust of pressure therefrom responsive generally to increases in brake pipe pressure.
A method of controlling braking on a rail vehicle to produce a graduated release of brake pressure, said rail vehicle having a pneumatic control valve, a brake pipe, at least one reservoir normally charged from the brake pipe, and a brake cylinder device, said method comprising:
A method for controlling braking on a rail vehicle to selectively produce a graduated release of brake pressure, said railcar having a pneumatic control valve, a brake pipe, at least one reservoir normally charged from the brake pipe, and a brake cylinder device, said method comprising:
A graduated release valve for a rail vehicle having a pneumatic control valve, a brake pipe, at least one reservoir charged from said brake pipe, and a brake cylinder, said graduated release valve comprising:
Dependencies are inferred from the claim text.