US PATENT SUBCLASS 137 / 625.69
.~.~.~.~.~ With annular passage (e.g., spool)

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  DF  .~.~ Supply and exhaust {4}
625.25  DF  .~.~.~ Reciprocating valve {3}
625.67  DF  .~.~.~.~ Piston valve {2}
625.69.~.~.~.~.~ With annular passage (e.g., spool)

DEFINITION

Classification: 137/625.69

(under subclass 625.67) Device wherein an annular exterior flow passage for the line fluid is provided between adjacent seat engaging heads.