US PATENT SUBCLASS 137 / 449
.~.~.~ Ball valves

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

386  DF  LIQUID LEVEL RESPONSIVE OR MAINTAINING SYSTEMS {11}
409  DF  .~ By float controlled valve {11}
434  DF  .~.~ Float arm operated valve {14}
449.~.~.~ Ball valves

DEFINITION

Classification: 137/449

(under subclass 434) Apparatus in which the valve controlled by the float arm is spherical in shape.

SEE OR SEARCH THIS CLASS, SUBCLASS:

539+, for spring biased ball valves which yield to direct pressure, e.g., check or safety valves.