Freight brake control valve device having improved quick service

Fluid-pressure and analogous brake systems – Automatic – Synchronizing

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Details

303 38, 303 41, B60T 1542

Patent

active

047766425

ABSTRACT:
A freight brake control valve device having an improved quick service function achieved by utilizing a common quick service volume during secondary quick service as well as preliminary quick service, in order to achieve an intensified secondary quick service reduction of brake pipe pressure. Further, a continuing local reduction of break pipe pressure is obtained without any time lag during 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 the preliminary quick service 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: 1898525 (1933-02-01), Down et al.
patent: 2068325 (1937-01-01), Hewitt
patent: 3988044 (1976-10-01), Hill
"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, Nov. 1980.

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