US PATENT SUBCLASS 251 / 69
.~.~ Trip operated on failure of electric power


Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

66  DF  BIASED TRIP {5}
68  DF  .~ Electrical trip actuation {2}
69.~.~ Trip operated on failure of electric power


DEFINITION

Classification: 251/69

(under subclass 68) Subject matter wherein the trip is operated to actuate the valve when the electric power supply to the electrical means fails.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27, for servo failure responsive control of a valve operated by a servo-motor.

SEE OR SEARCH CLASS

137, Fluid Handling,

66, for thermoelectric type combustion failure responsive fuel safety cut-offs for burners.