Air brake control valve with combined graduated and direct relea

Details Air brake control valve with combined graduated and direct relea Air brake control valve with combined graduated and direct relea

1994-09-23

1995-07-04

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Automatic

Synchronizing

303 74, B60T 1556

Patent

active

054294274

ABSTRACT:
A control valve is mounted to a pipe bracket which also includes a manual release valve and an emergency vent valve. The control valve operates with a single reservoir to perform service and emergency brake applications. A pair of interrelated pistons responsive to brake cylinder pressure, brake pipe pressure and control volume pressure operate a supply valve, a quick service valve end exhaust valve to maintain a fixed ratio of brake cylinder pressure to brake pipe pressure reduction. Quick service volume is continuously vented and appropriate valving is provided to allow plural sequential quick service operations. Structures provided to operate the piston stack so as to initially allow graduated brake release and subsequent direct brake release over the brake releasing range. An accelerated emergency release mechanism is also provided. The supply reservoir is only charged during the direct release mode. Brake cylinder pressure is exhausted to brake pipe following an emergency application and is exhausted to atmosphere after a service application.

REFERENCES:
patent: 4558907 (1985-12-01), Reiss et al.
patent: 4775194 (1988-10-01), Vaughn et al.
patent: 4776642 (1988-10-01), Hart et al.
patent: 4783124 (1988-11-01), Gaughan et al.
patent: 4819993 (1989-04-01), Gaughan et al.

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