US PATENT SUBCLASS 137 / 168
.~.~.~.~ Gas inlet and outlet valves unitary

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

154  DF  DIVERSE FLUID CONTAINING PRESSURE SYSTEMS {7}
156  DF  .~ Gas pressure discharge of liquids feed traps (e.g., to boiler) {3}
159  DF  .~.~ Gas pressure controlled by amount of liquid in trap {3}
165  DF  .~.~.~ Float responsive {3}
168.~.~.~.~ Gas inlet and outlet valves unitary

DEFINITION

Classification: 137/168

(under subclass 165) Feed-traps provided with gas inlet and outlet valves which are integrally mounted on a single actuating stem.

(1) Note. See the class definition, section 4 for search notes on plural valves in the fluid handling systems of this and related classes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

411, for liquid level responsive or maintaining systems in which plural valves are controlled by one float.