US PATENT SUBCLASS 137 / 218
.~.~.~ With co-acting valve in liquid flow path

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

215  DF  BACK FLOW PREVENTION BY VACUUM BREAKING (E.G., ANTI-SIPHON DEVICES) {1}
216  DF  .~ Air vent in liquid flow line {2}
217  DF  .~.~ Valved {1}
218.~.~.~ With co-acting valve in liquid flow path

DEFINITION

Classification: 137/218

(under subclass 217) Apparatus wherein a valve is provided in the liquid flow path which operates in conjunction with the air vent valve.

SEE OR SEARCH THIS CLASS, SUBCLASS:

861+, for distribution systems having plural valved flow paths, and see the search notes to subclass 861.