US PATENT SUBCLASS 251 / 70
.~.~ With electrical resetting means


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}
70.~.~ With electrical resetting means {1}
71  DF  .~.~.~> Rotary electric motor


DEFINITION

Classification: 251/70

(under subclass 68) Subject matter wherein an additional electrical means is provided for resetting the valve and/or trip.

(1) Note. A usual arrangement is one wherein the additional electrical means draws the valve head back against the biasing means and wherein the latch then engages to hold the valve in the biased position until the trip is actuated.

SEE OR SEARCH CLASS

137, Fluid Handling,

66, for thermoelectric control of resetting for combustion failure responsive fuel safety cut-offs for burners and subclasses 456+ for safety cut-offs which must be reset by external means, many of these devices being of the trip type.