US PATENT SUBCLASS 303 / 55
.~.~ Preliminary discharge

Current as of: June, 1999
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303 /   HD   FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS

50  DF  MOTORMAN'S VALVES {4}
54  DF  .~ Equalizing {1}
55.~.~ Preliminary discharge

DEFINITION

Classification: 303/55

Motorman's valves in which a diaphragm is balanced by opposing pressures, the valve containing means for modifying the relation of the opposing pressures to permit the control-pipe pressure to reduce to any desired point.