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Reciprocating pump and control using outlet valve position sensors

  • US 4,915,591 A
  • Filed: 05/09/1988
  • Issued: 04/10/1990
  • Est. Priority Date: 01/08/1986
  • Status: Expired due to Fees
First Claim
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1. A precision reciprocating metering pump and control therefore comprising, a pump head casing with at least two displacement chambers having inlet and outlet ports, a piston for each displacement chamber, with at least one performing its displacement stroke at any given time whereby a pre-compression stroke is carried out prior to each such displacement stroke in order to compensate for the influence of the specific compressibility of the liquid being pumped on the pumping efficiency of the delivery system, a pair of check valve units associated with the inlet and outlet ports, at least one outlet check valve unit (28) comprising in part components made of transparent material, with a check valve ball (31) however, being colored or opaque, a piston position indicator and a sensor device monitoring the actual onset of the liquid displacement and connected to a piston speed control circuitry, whereby the underlying feed-back principle is characterized by said sensor device (111) monitoring the actual onset of the liquid displacement as triggered by the lifting of a check valve ball (31) from its seat (30) in at least one outlet check valve unit (28), and the sensor device (111) for monitoring the actual onset of liquid delivery, is an optical system, as for example, a light-gate, which is triggered by the lifting of the check valve ball (31) from its seat (30).

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