Freight brake control valve device having improved quick service

Fluid-pressure and analogous brake systems – Automatic – Synchronizing

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Details

303 41, 303 44, B60T 1530

Patent

active

047831243

ABSTRACT:
A freight brake control valve device having an improved quick service function achieved by providing an additional volume upstream of the quick service limiting valve with which the brake pipe fluid under pressure is equalized during the second stage of quick service to achieve an intensified secondary quick service reduction of brake pipe pressure. Further, a smooth and continuous local reduction of brake pipe pressure occurs without any time lag at the time of transition from preliminary to secondary stage quick service. In a first embodiment of the invention, an exhaust passage separate from the brake cylinder exhaust passage is provided to assure venting of this additional volume in the event the brake cylinder retainer valve is set up. In a second embodiment, the additional volume is vented via the brake cylinder exhaust passage.

REFERENCES:
patent: 2033461 (1936-03-01), Farmer
patent: 2055967 (1936-09-01), Campbell
"AB" Single Capacity Freight Car Air Brake Equipment with the ABD Control Valve, Sep. 1979.
"AB" Single Capacity Freight Car Air Brake Equipment with the ABDW Control Valve.

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