US PATENT SUBCLASS 137 / 470
.~.~ Pop closing valves

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
469  DF  .~ Pop valves {5}
470.~.~ Pop closing valves

DEFINITION

Classification: 137/470

(under subclass 469) Valves in which the auxiliary reactor surface aids in valve closing.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

15+, for valves opened by external means with compulsory cut-off after a flow period by the effect of the flowing liquid on an auxiliary surface, and subclasses 48+ for valve actuators with dashpot or fluid controlled retarders or timers.