US PATENT SUBCLASS 417 / 440
.~ Having separate noncyclic valve (e.g., bypass, etc.)

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
440.~ Having separate noncyclic valve (e.g., bypass, etc.) {1}
441  DF  .~.~> For serial control of pump fluid (e.g., throttle valve)

DEFINITION

Classification: 417/440

(under subclass 437) Apparatus provided with valve means other than that necessary for controlling inlet and discharge

of pumped fluid to the pump chamber during normal operation of the pump, said valve means being operable to control the flow of pumped fluid to or from the pump chamber or conduit therefor.

(1) Note. A valve positioned to permit the independent flow of fluid around the pump from the inlet of the pump to the pump discharge is included under this definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

279+, for a pump fluid control valve which is responsive to a pump condition.

434, for a separate port or valve for filling or draining a pump portion.