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.