US PATENT SUBCLASS 236 / 24
.~.~ Two or more valves

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

20 R  DF  CLOSED FLUID HEATERS {8}
*  DD  .~ Combined thermostat and flow controlled {2}
24.~.~ Two or more valves

DEFINITION

Classification: 236/24

(under subclass 20) Devices in which the heating means, usually a gas-burner, is controlled by the combined action of a thermostat in the fluid heated and a flow-motor operated by the flow of the fluid heated, the thermostat and motor operating on separate valves.