US PATENT SUBCLASS 137 / 288
.~.~.~ Piston type valve

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

272  DF  HYDRANT TYPE {15}
286  DF  .~ Movable riser actuated valve {1}
287  DF  .~.~ Reciprocating riser {1}
288.~.~.~ Piston type valve

DEFINITION

Classification: 137/288

(under subclass 287) Apparatus in which the valve is a piston cooperating with one or more ports in a cylindrical valve seat.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

318+, for reciprocating valves of general utility, and see the search notes thereto, and subclasses 324+ for piston valves, per se.