US PATENT SUBCLASS 251 / 318
RECIPROCATING VALVE

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

318RECIPROCATING VALVE {7}
319  DF  .~> Push or pull operator {1}
324  DF  .~> Piston {1}
326  DF  .~> Gate {3}
330  DF  .~> Actuator controlled stem seal
331  DF  .~> Diaphragm
332  DF  .~> Diverse material seal at valve interface
333  DF  .~> Particular head and seat cooperation {1}

DEFINITION

Classification: 251/318

(under the class definition) Subject matter wherein the valve has a linear motion to and from flow obstructing position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

62+, for piston type fluid actuated or retarded valve.

129.16, the armature is the valve closure.

215+, and 264+, for screw actuated valves.

SEE OR SEARCH CLASS

137, Fluid Handling,

288, and 307 for piston type valves in hydrants, subclass 433 for a rectilinearly moving float rigid with a valve, subclasses 442+ for valve and float arm assembly mounted on pipe terminal, the valve reciprocating axially of the pipe and subclasses 528+ for reciprocating check and safety valves, subclasses 625.25+ for reciprocating supply and exhaust multiway valve units.

222, Dispensing,

559+, for reciprocating dispenser valves.

277, Seal for a Joint or Juncture, for a generic sealing means or process,

628+, for a static contact seal for other than an internal combustion engine, or a pipe, conduit, or cable.