US PATENT SUBCLASS 122 / 451.2
.~.~.~ Pressure-operated valve


Current as of: June, 1999
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122 /   HD   LIQUID HEATERS AND VAPORIZERS

451 R  DF  FEEDERS {4}
451.1  DF  .~ Automatic {1}
451.1  DF  .~.~ Thermally controlled {1}
451.2.~.~.~ Pressure-operated valve


DEFINITION

Classification: 122/451.2

(under subclass 451.1) Devices in which the controlling-valve is operated by fluid-pressure means, which may be the pressure generated in a thermostat of the expanding-fluid type.