B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/46
B60T 15/42 (2006.01)
Patent
CA 1313392
ABSTRACT OF THE INVENTION 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 brake 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.
581018
Gaughan Edward W.
Hart James E.
Hill Theodore B.
Fetherstonhaugh & Co.
Westinghouse Air Brake Company
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