US PATENT SUBCLASS 137 / 400
.~ With supplemental or safety closing means or bias

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

386  DF  LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
400.~ With supplemental or safety closing means or bias {2}
401  DF  .~.~> Sinking or bucket type float
402  DF  .~.~> Gravitating tank

DEFINITION

Classification: 137/400

(under subclass 386) Apparatus which (1) includes the application of a supplemental force or bias that will insure the closing of the valve controlled by the liquid level responsive means, or (2) is combined with means to insure that the flow is stopped, in case the valve fails to close properly when urged in closing position by the liquid level sensing means.