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Control system and method for chemical injectors

  • US 5,071,320 A
  • Filed: 02/26/1990
  • Issued: 12/10/1991
  • Est. Priority Date: 11/03/1988
  • Status: Expired due to Fees
First Claim
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1. A device for adjusting the volumetric capacity of a chemical injector in response to receiving a drive signal from a remote controller, the injector including a cylinder-like housing having a cavity and a reciprocal piston-like element dividing the cavity into an injection chamber and a complement chamber, the adjusting device comprising:

  • stop means, located in the path of reciprocal motion of the piston-like element, for limiting the reciprocal motion and thereby limiting the available volume of the injection chamber and the volumetric injection capacity of the injector;

    power means, responsive to the drive signal, for controlling the position of the stop means with respect to the reciprocal piston-like element, along the path of reciprocal motion and thereby adjusting the volumetric injection capacity of the injector;

    capacity measuring means for indicating the volumetric injection capacity of the injector and providing a capacity signal indicative of the volumetric injection capacity; and

    a clutch assembly connected between the power means and the stop means.

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