Freight brake control valve device having improved quick...

Details Freight brake control valve device having improved quick... Freight brake control valve device having improved quick...

B - Operations, Transporting

60

T

303/46

B60T 15/42 (2006.01) B60T 15/32 (2006.01) B60T 15/46 (2006.01)

Patent

CA 1313390

ABSTRACT OF THE INVENTION A freight brake control valve device having an improved quick service function provided by suppressing premature cut off operation of the quick service limiting valve. In one embodiment of the invention, this is accomplished by connecting the quick service volume pressure to the underside of the quick service limiting valve piston during preliminary quick service to counteract the pressure pulse on the opposite side of the piston that occurs during the transition betwen the preliminary and secondary stages of quick service. In a second embodiment, pressure is created at the underside of the quick service limiting valve piston by dashpot action of the piston itself.

581016

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