US PATENT SUBCLASS 137 / 216
.~ Air vent in liquid flow line

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.~ Air vent in liquid flow line {2}
216.1  DF  .~.~> With liquid seal in liquid flow line {1}
217  DF  .~.~> Valved {1}

DEFINITION

Classification: 137/216

(under subclass 215) Apparatus wherein the back flow is prevented by an air vent or gap in the liquid flow line.

SEE OR SEARCH THIS CLASS, SUBCLASS:

143, for vent type breakers in flow devices which are intended to act as siphons.

583+, for distribution systems having plural flow passages, one of which is a gas vent, and see the search notes to subclasses 583 and 587.