TM 55-203
Figure 8-36. Wabcotite pipe union.
Figure 8-35. Wabcottie fitting as used on the brake
cylinder and reservoir.
of this fourth or slow direct exhaust position avoids the
necessity for resetting a retaining valve en route, especially
on adverse grades. This new design of pressure retaining
valve has many constructional features which are
considered improvements over the former types. The
valve is mounted upon a pipe bracket which is fastened
permanently upon the car and to which the pipe connection
is made. This arrangement makes it possible to remove
the valve for cleaning and repairs without interfering with
the piping. A strainer, similar in construction to the AB
valve brake pipe strainer, is located in the bracket for
cleaning the air before it passes to the valves and chokes
within the retainer. A wasp excluder, similar to the
separate unit now being furnished with the standard
retaining valve is built into the retainer body casting. It
consists of a flexible rubber diaphragm confined within a
bell-shaped housing. A Wabcotite fitting connects the
retainer pipe to the retainer pipe bracket. This insures
against breakage of the pipe at this point. Provision is
made for attaching the device for testing the brake
cylinder, retainer pipe, and retainer without removal from
the car.
(2) Exhaust positions. The exhaust of brake
cylinder air through the release control retainer in the four-
Figure 8-37. Centrifugal dirt collector.
handle positions is as follows:
(b) In high pressure position, handle 5 is turned to the
position marked HP, 45 degrees below horizontal. The
(a) In direct position, handle 5 is turned downward to
triple valve exhaust is through strainer 25, chamber A, past
the position marked EX. The triple valve exhaust is
low pressure valve 4, through intermediate choke b, past
through strainer 25, chamber A, unrestricted passage g,
high pressure 4a, through final choke t, passage s, drilled
and past wasp excluder 22 to atmosphere in unrestricted
port x in cock key 6, and past wasp excluder 22 to
normal manner.
atmosphere. The pressure retaining valve of each valve is
10 pounds, and since the
8-43
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