US PATENT SUBCLASS 137 / 625.2
.~.~ Supply and exhaust

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

561 R  DF  SYSTEMS {32}
625  DF  .~ Multi-way valve unit {12}
625.2.~.~ Supply and exhaust {4}
625.6  DF  .~.~.~> Pilot-actuated {3}
625.65  DF  .~.~.~> Motor-operated {1}
625.21  DF  .~.~.~> Rotary valve {1}
625.25  DF  .~.~.~> Reciprocating valve {3}

DEFINITION

Classification: 137/625.2

(under subclass 625) Devices comprising a flow line controlled by a valve unit which has a passage connectible between atmosphere and the downstream portion of the line,

whereby that portion may be completely drained or fluid therein may escape to waste.

SEE OR SEARCH THIS CLASS, SUBCLASS:

307+, for similar structure in hydrant valves.

589, and 596+, for systems which are vented or drained.