Freight brake emergency valve

Details Freight brake emergency valve Freight brake emergency valve

B - Operations, Transporting

60

T

303/35

B60T 17/04 (2006.01) B60T 15/42 (2006.01)

Patent

CA 2005296

An improved freight brake emergency valve device providing improved stability against undesired emergency brake applications without degradation of emergency sensitivity. This is achieved, in one aspect of the invention, by introducing a spring force on the emergency piston as the piston approaches emergency position to thereby retard the piston momentum sufficiently to allow a random brake pipe pressure fluctuation to dissipate. In another aspect of the invention, a choke and check valve are arranged to create a dashpot effect to retard piston momentum resulting from a random brake pipe pressure fluctuation.

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