US PATENT SUBCLASS 137 / 458
.~.~ Responsive to both high and low pressure or velocity

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
456  DF  .~ Safety cut-off requiring reset {7}
458.~.~ Responsive to both high and low pressure or velocity

DEFINITION

Classification: 137/458

(under subclass 456) Apparatus in which the valve member is provided with a means to close the valve in response to a predetermined low pressure or velocity of line fluid at a point in the line, and also with means to close the valve in response to a predetermined high internal pressure or velocity occurring in the line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

180, for diverse fluid containing pressure systems in which a liquid drain is provided responsive to abnormal pressures.

493+, for bi-directional flow responsive valves.