Fluid-pressure and analogous brake systems – Automatic – Synchronizing
Patent
1993-10-06
1994-07-05
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Automatic
Synchronizing
303 33, 303 37, 303 39, 303 86, B60T 1704
Patent
active
053261593
ABSTRACT:
A quick service limiting valve device for a freight brake control valve employing a primary valve in a fluid flow path via which brake pipe air is connected to the brake cylinder during a secondary phase of quick service to propagate the brake pipe reduction signal until the brake cylinder pressure acting on the limiting valve control piston effects closure of the primary valve to terminate the quick service flow of brake pipe air to the brake cylinder when a predetermined brake cylinder limit pressure is realized. A secondary valve is arranged to interrupt the brake pipe to brake cylinder flow path downstream of the primary valve in the event leakage at the primary valve causes the pressure acting on the quick service limiting valve control piston to exceed the predetermined limit pressure. Until this limit pressure is exceeded, the secondary valve is bypassed so that only the primary valve controls the brake pipe to brake cylinder flow path via the limiting valve, thereby reducing hysteresis due to friction to obtain more efficient limiting valve operation.
REFERENCES:
patent: 4819993 (1989-04-01), Gaughan et al.
Gaughan Edward W.
Hart James E.
Butler Douglas C.
Falce Gary J.
Westinghouse Air Brake Company
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