US PATENT SUBCLASS 303 / 45
.~ Positive-movement equalizing valve

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303 /   HD   FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS

28  DF  AUTOMATIC {13}
45.~ Positive-movement equalizing valve

DEFINITION

Classification: 303/45

Devices for moving the equalizing-valve main piston by means other than the usual unbalancing of pressures in control-pipe and local supply. The purpose is usually to move the piston to release position when stuck.