US PATENT SUBCLASS 137 / 119.02
.~.~.~.~ Four port reversing valve

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

87.01  DF  SELF-PROPORTIONING OR CORRELATING SYSTEMS {8}
109  DF  .~ Self-controlled branched flow systems {4}
118.01  DF  .~.~ Plural outflows {5}
119.01  DF  .~.~.~ Alternately or successively substituted outflow {7}
119.02.~.~.~.~ Four port reversing valve

DEFINITION

Classification: 137/119.02

Four port reversing valve:

(under subclass 119.01) Subject matter including a four way valve having an inlet port, an outlet port and two intermediate ports, the valve being selectively movable into two positions, in one position the inlet port being connected to the first intermediate port and the second intermediate port being connected to the outlet port, and in the other position the inlet port being connected to the second intermediate port and the first intermediate port being connected to the outlet port.

SEE OR SEARCH THIS CLASS, SUBCLASS:

309+, for reversing valves in connection with a regenerative type of furnace.

625.43, for four port reversing valve not of the correlating type.