US PATENT SUBCLASS 169 / 19
AUTOMATIC VALVES


Current as of: June, 1999
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169 /   HD   FIRE EXTINGUISHERS

19AUTOMATIC VALVES {1}
20  DF  .~> Pressure controlled {2}


DEFINITION

Classification: 169/19

(under the class definition) Valves for normally restraining flow through a fluid system and opening automatically to permit flow upon the occurrence of fire conditions. Usually an increase of temperature in the protected area is the ultimate condition which governs the operation of the valve.

SEE OR SEARCH CLASS

137, Fluid Handling,

65+, 72+, 79+, 457, and 468 for other valve actuation responsive to increased temperature.