US PATENT SUBCLASS 137 / 102
.~ Supply and exhaust type

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
102.~ Supply and exhaust type {3}
103  DF  .~.~> Vacuum or suction pulsator type (e.g., milking machine) {2}
106  DF  .~.~> Reversing or 4-way valve systems
107  DF  .~.~> Waste responsive to flow stoppage

DEFINITION

Classification: 137/102

(under subclass 87.01) Systems in which an outlet or receiver alternatively receives a fluid from a source of supply and drains the fluid to an exhaust, the flow of fluid from the supply or to the exhaust, being controlled in response to a means sensing a change in condition.

(1) Note. Many of the patents classified in this subclass are drawn to distributor valves for fluid motors.

SEE OR SEARCH THIS CLASS, SUBCLASS:

224+, for tire inflation apparatus which may have condition responsive filling and relief valves

596+, for distribution systems involving stop and waste arrangements, and see the search notes thereto.

SEE OR SEARCH CLASS 91, Motors: Expansible Chamber Type, appropriate subclasses for apparatus under this definition combined with an expansible chamber motor which is controlled thereby.