US PATENT SUBCLASS 417 / 44.2
.~.~ Responsive to pump fluid pressure

Current as of: June, 1999
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417 /   HD   PUMPS

1  DF  CONDITION RESPONSIVE CONTROL OF PUMP DRIVE MOTOR {22}
44.1  DF  .~ By control of electric or magnetic drive motor {3}
44.2.~.~ Responsive to pump fluid pressure {7}
44.4  DF  .~.~.~> Low pressure stops motor from turning on pump
44.5  DF  .~.~.~> Mercury switch
44.6  DF  .~.~.~> Dial-type sensor
44.7  DF  .~.~.~> Bellow-type sensor
44.8  DF  .~.~.~> Piston-type sensor
44.9  DF  .~.~.~> Diaphragm
44.3  DF  .~.~.~> Inlet pressure

DEFINITION

Classification: 417/44.2

Responsive to pump fluid pressure:

(under subclass 44.1) Apparatus having a sensing means responsive to variation in pressure present in the fluid flowing to or out from the pump and which causes operation of the control means to alter the operation of the motor.

(1) Note. The fluid pressure may be transmitted to the sensing means via another liquid (e.g., mercury column).