Brake Tests
År: 1913
Forlag: Pensylvania Railroad Company
Sted: Altoona, Penna.
Sider: 401
A Report Of A Series Of Road Tests Of Brakes On Passanger Equipment Cars Made At Absecon, New Jersey, In 1913
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38
78. The piston travel will vary with the brake cylinder pressure
due to the deflection of members, lost motion in the rigging and so on.
Fig. 23.
QUICK ACTION TRIPLE VALVE (P-2).
The valve is used with the standard PM brake equipment.
The relation between brake cylinder pressure and piston travel will be
different with each type of brake rigging or the same rigging on different
cars. Consequently, it is not practicable to establish the average for
what is likely to be found in service. It is desirable, however, to estab-
lish the ideal relation between brake cylinder pressure and piston
travel, which would exist if the rigging were well designed, the best
material used and the installation made throughout in as satisfactory
and efficient a manner as practicable.
79. As a guide to what this ideal relation should be, records were
taken on some of the cars used during the test from which the per-
formance of the brake rigging under test was determined. (See Figs.
77, 78, 79 and Par. 295.) From a study of these cards and a consideration