US PATENT SUBCLASS 417 / 279
WITH CONDITION RESPONSIVE PUMPED FLUID CONTROL

Current as of: June, 1999
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417 /   HD   PUMPS

279WITH CONDITION RESPONSIVE PUMPED FLUID CONTROL {22}
280  DF  .~> Responsive to pump created drive motor condition
281  DF  .~> Lubricant condition responsive
282  DF  .~> Plural separate sensing means for a single fluid controller
283  DF  .~> Bypass or relief valve controls venting by movable pump chamber part
284  DF  .~> Bypass or relief valve carried by movable pumping member
285  DF  .~> Valve passage directly connecting concurrently contracting and expanding nonrotary pump chambers
286  DF  .~> Plural pump units with individual or relative control {2}
289  DF  .~> Variable cutoff or pumping member controlled port
290  DF  .~> Having timer or delay means for fluid controller
291  DF  .~> Reversibly driven pump having bypass active in either flow direction
292  DF  .~> Pumped fluid temperature responsive
293  DF  .~> Driven pump part speed responsive {1}
295  DF  .~> Inlet throttle or stop valve
296  DF  .~> Bypass or relief valve part carried by or carries distributor part
297  DF  .~> Expansible chamber pump distributor operation modified {2}
299  DF  .~> Normally open bypass or relief passage closed by increased pressure or flow
300  DF  .~> Fluid flow rate responsive
301  DF  .~> Inlet pressure increase opens bypass from pump inlet to discharge
302  DF  .~> Plural paths having individual condition responsive control means {2}
305  DF  .~> Manual actuation of condition responsive valve
306  DF  .~> Pump inlet or pump chamber vented to ambient (e.g., vacuum breaker)
307  DF  .~> Pressure responsive relief or bypass valve {4}

DEFINITION

Classification: 417/279

(under the class definition) Apparatus comprising fluid flow control means for varying the flow of pumped fluid, and including means sensing the occurrence of a condition or change in condition of either the pump or the fluid being pumped to actuate the control means.

(1) Note. The terms "bypass" and "relief" as used in subclasses indented hereunder are defined as follows: bypass, a flow line which connects the pump discharge passage directly to the pump intake passage, and relief, a flow line which connects the pump discharge directly to exhaust (e.g., a sump, atmosphere or the like).

(2) Note. Valves which may ordinarily be considered to be fluid flow or condition responsive (e.g., check valves, etc.) are excluded from this and the indented subclasses if they normally are operated through a cycle every time the pump or

pumping member with which they are associated is operated through its normal pumping cycle. However, (1) spring biased valves which are solely disclosed as being bypass or relief valves even though they may operate cyclically and (2) normally cyclically operable valves which have their cycle or operation altered or modified by a change of condition have been included in this and indented subclass. See subclasses 297+ for the latter type. See subclasses 502 and 503 for multiple cyclic outlet and inlet paths, respectively, and subclass 504 for plural outlet paths to a single discharge line acting under different conditions.

(3) Note. The control of an atmospheric air inlet to the pulsation dampening chamber of a pump is not included in this subclass. See subclasses 540+ and the notes thereto for the classification of such devices.

SEE OR SEARCH THIS CLASS, SUBCLASS:

270, for pumps having three or more radial, parallel, or coaxially arranged cylinders having condition responsive control of the pump fluid. SEE OR SEARCH CLASS

137, Fluid Handling,

115.01+, for a self-proportioning system having a by-pass or relief controlled by a main line condition.