TM 55-203
Figure 8-49. Retarded release and recharging positions.
voir on account of the flow of air from chamber H
(2) Retarded release. exhaust cavity n in the
through feed groove i into the auxiliary reservoir, which
slide valve now connects port r leading to the brake
is going on at the same time, the triple valve parts will
cylinder with port p to the atmosphere, and the brake will
remain in this position, as shown in figure 8-45. Brake
release; but as the small "tail port" extension of cavity n
cylinder air is exhausted through port r, large cavity n in
is over exhaust port p, the discharge of air from the
the slide valve, and port p leading to the atmosphere (or
brake cylinder to the atmosphere is quite slow. In this
retaining valve). The auxiliary reservoirs recharge as
way, the brakes on the front end of the train require a
described under "Full Release and Charging. " If,
longer time to release than those on the rear. This
however, the triple valve is near the head of the train,
feature is called the "retarded release," and although the
and the brake pipe pressure builds up more rapidly than
triple valves near the locomotive commence to release
the auxiliary reservoir can recharge, the necessary
before those in the rear, yet the exhaust of air from the
excess of pressure in chamber H over that in the
brake cylinder in retarded release position is sufficiently
auxiliary reservoir will be attained quickly, and will cause
slow to hold back the release of the brakes at the front
the piston to compress retarding spring 33, and move
end of the train long enough to insure a practically
the triple valve parts to the position shown in figure 8-
simultaneous release of the brakes on the train as a
49.
whole. This permits releasing the brakes on
8-52
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