US PATENT SUBCLASS 417 / 26
.~ With condition responsive control of pump fluid valve

Current as of: June, 1999
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417 /   HD   PUMPS

1  DF  CONDITION RESPONSIVE CONTROL OF PUMP DRIVE MOTOR {22}
26.~ With condition responsive control of pump fluid valve {3}
27  DF  .~.~> Having independent means for delaying valve actuation
28  DF  .~.~> Fluid and motor controls have common sensing element
29  DF  .~.~> Fluid and motor controls separately responsive to diverse conditions {1}

DEFINITION

Classification: 417/26

(under subclass 1) Subject matter including valve means for varying the flow of fluid being pumped, which valve means is operated by sensing the occurrence of a condition or change of condition in the fluid being pumped.

(1) Note. This definition is not intended to include those devices in which there is a single sensing means operating a valve whose sole function is to divert a portion of the

pumped fluid to cause operation of the drive motor control means, such devices have been considered to be merely pilot valves for the drive control means.

(2) Note. A direct acting valve, e.g., a check valve which is responsive only to the direction of flow in a line is not included. However, a valve which diverts flow from one line to another, in a branched system, even though dependent only on the direction of flow in the lines is included.

(3) Note. For purposes of this definition, pump fluid includes any fluid which is caused to be moved by the pump. Therefore, a gas vent valve for spoiling a liquid pump by allowing gas to enter the pump is included under this definition. Also, a discriminating valve for allowing gas, but not liquid, to be vented from a liquid pumping system is included.

SEE OR SEARCH THIS CLASS, SUBCLASS:

10, for condition responsive control of pump fluid which is utilized as motive fluid for starting an internal combustion engine drive motor.