US PATENT SUBCLASS 137 / 514
.~.~ With retarder or dashpot

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

455  DF  LINE CONDITION CHANGE RESPONSIVE VALVES {11}
511  DF  .~ Direct response valves (i.e., check valve type) {14}
514.~.~ With retarder or dashpot {2}
514.3  DF  .~.~.~> End of valve forms dashpot chamber
514.5  DF  .~.~.~> End of valve moves inside dashpot chamber {1}

DEFINITION

Classification: 137/514

(under subclass 511) Valves provided with a dashpot or other retarding means to prevent or reduce chattering or hunting of the valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

494+, for valves having separate connected reacting surfaces which have a positive relation to the operation of the valve, i.e., assist in or cause either the opening or closing movement of the valve.

SEE OR SEARCH CLASS

188, Brakes,

297+, for a dashpot of general utility.

251, Valves and Valve Actuation, 15+, for flow responsive valves having a timing retarding chamber to cut off flow after a predetermined flow period, subclasses 48+ for valves with fluid operated retarding means, and see the search notes to subclass 48, and subclass 64 for valve actuators with retarding means other than the

fluid type.