US PATENT SUBCLASS 251 / 62
.~ Piston type expansible chamber reciprocating valve actuator

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

12  DF  FLUID ACTUATED OR RETARDED {12}
62.~ Piston type expansible chamber reciprocating valve actuator {3}
63  DF  .~.~> Unitary piston and valve
63.4  DF  .~.~> Lost motion, abutment or resilient connection between actuator and valve
63.5  DF  .~.~> Coaxial actuator, seat and valve {1}

DEFINITION

Classification: 251/62

(under subclass 12) Subject matter in which the valve includes a reciprocating fluid control member and the actuator comprises an expansible chamber device having as a working member either a cylinder or a piston, relatively movable therein, the cylinder and piston forming an expansible chamber, the volume of the expansible chamber changing with a corresponding relative movement of the piston and cylinder in response to the supply of control fluid to the chamber, such relative movement effecting actuation of

the control member.

(1) Note. The fluid actuating the expansible chamber device is distinct from the fluid controlled by the control member of the valve; that is a separate fluid or fluid valved from the controlled fluid is admitted to the expansible chamber to effect relative movement of the cylinder and piston. See the Search Class note below to Class 137 for devices excluded under this definition.

(2) Note. The patents in this and the indented subclasses are necessarily directed to a combination the combination of a reciprocating valve and an expansible chamber device, per se, is classified in Class 92 where a comprehensive breakdown is provided, patents which disclose a specific Class 92 device in combination with a valve, but do not claim such combination and where the improvement is directed to the Class 92 device only, should not be cross-referenced into this and the indented subclasses. Rather, a cross-reference should be made to the appropriate subclass in Class 92.

SEE OR SEARCH CLASS

92, Expansible Chamber Devices, appropriate subclass for piston and cylinder structure.

137, Fluid Handling, 494+, for a valve having a separate connected fluid reactor surface.