US PATENT SUBCLASS 251 / 69
.~.~ Trip operated on failure of electric power
Current as of:
June, 1999
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251 /
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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.