Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1995-05-23
1996-04-02
Ballato, Josie
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
303 33, 303 38, 303128, B60T 1134
Patent
active
055034675
ABSTRACT:
A backup pneumatic emergency control valve for an electro-pneumatic brake system for a railroad freight car comprising an emergency portion of a standard AB type freight brake control valve device without the service portion. In the absence of a service portion in which the release function of an emergency brake application is normally provided, the emergency portion is modified to achieve this release function in one embodiment by venting the inshot valve control chamber to which brake cylinder pressure is typically connected via the high pressure spool valve during brake pipe recharge following an emergency brake application; and in another embodiment by replacing the accelerated emergency release check valve with a plug to isolate brake cylinder pressure in a backdump passage from the brake pipe and venting the check valve cavity to provide a means of exhausting brake cylinder pressure via the backdump passage when the backdump spool valve is moved to release position by the emergency piston during brakepipe recharge following an emergency brake application.
REFERENCES:
patent: 4776642 (1988-10-01), Hart et al.
patent: 5064251 (1991-11-01), Romansky
patent: 5358315 (1994-10-01), Balukin
patent: 5393129 (1995-02-01), Troiani et al.
Ballato Josie
Falce Gary J.
Westinghouse Air Brake Company
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