Patent
Emergency valve for ABD freight brake control valve device
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TLDR
In this paper, an improved freight brake emergency valve device has been proposed, having improved stability against undesired emergency brake applications, without loss of emergency sensitivity, using a flow regulator in the form of a valve and choke combination or a choke itself.Abstract:
An improved freight brake emergency valve device having improved stability against undesired emergency brake applications, without loss of emergency sensitivity. Flow regulator in the form of a valve and choke combination or a choke itself is employed between the quick action chamber and the chamber normally subject to quick action chamber pressure on the side of the emergency piston opposite brake pipe pressure. This has the effect of momentarily reducing the volume of quick action chamber pressure in order to achieve an intensified pressure reduction in response to initial deflection of the piston member sufficient to counteract a momentary, spurious brake pipe pressure fluctuation.read more
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Jason Connell,Eric C. Wright +1 more
TL;DR: In this paper, a brake cylinder maintaining system produces a reference pressure based on the difference between the brake pipe pressure and the auxiliary reservoir pressure and then feeds that pressure to a choke and a volume so that the ratio of the reference area of the choke to the volume of stored brake cylinder reference pressure is substantively equal to the ratio for a charging valve area to the brake cylinder volume.
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Patent
Freight brake control valve having an emergency piston slide valve arranged to provide an accelerated brake application function
Weber Charles L,James E. Hart +1 more
TL;DR: In this article, a freight brake control valve device is arranged to incorporate, in conjunction with the conventional service stability function provided thereby, an accelerated service application function in which a continuous local venting of brake pipe pressure is provided to hasten propagation of service rates.
Patent
Freight brake emergency valve
TL;DR: In this article, an improved freight brake emergency valve device providing improved stability against undesired emergency brake applications without degradation of emergency sensitivity was proposed. But this was achieved by introducing a spring force on the emergency piston as the piston approached emergency position to thereby retard the piston momentum sufficiently to allow a random brake pipe pressure fluctuation to dissipate.