US PATENT SUBCLASS 137 / 456
.~ Safety cut-off requiring reset

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
456.~ Safety cut-off requiring reset {7}
457  DF  .~.~> Thermal
458  DF  .~.~> Responsive to both high and low pressure or velocity
459  DF  .~.~> Responsive to change in rate of flow {1}
461  DF  .~.~> High pressure cut-off
462  DF  .~.~> Reset by pressure equalization valve or by-pass
463  DF  .~.~> Fluid released trip
464  DF  .~.~> Fluid counter-biased or unseated valve {2}

DEFINITION

Classification: 137/456

(under subclass 455) Apparatus in which a valve closes in response to a change in internal condition of the line fluid but does not open when the line condition returns to its previous state, the necessary reopening or resetting operation being performed by an external operator, usually manually.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50, and 57, for excess speed responsive cut-offs.

65+, for fuel safety cut-offs responsive to combustion failure in a burner.

405, for oil burner fuel overflow preventing safety cut-offs.

467, for line condition change opened valves which require resetting. SEE OR SEARCH CLASS

141, Fluent Material Handling, With Receiver or Receiver Coacting Means,

198+, for cut-off valves operated by means responsive to level in a receptacle being filled, said means not including mere increase in line pressure.

251, Valves and Valve Actuation,

15+, for valves which are opened by manual or mechanical means and closed by line fluid reaction after a predetermined flow period.