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Apparatus reponsive to pressure of a medium which effects fluid discharge for controlling the pressure of the medium and the time the medium acts on the fluid

  • US 5,188,258 A
  • Filed: 03/29/1991
  • Issued: 02/23/1993
  • Est. Priority Date: 04/07/1990
  • Status: Expired due to Term
First Claim
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1. In combination, a quantitative fluid discharge device having fluid within a container and means responsive to pressurization of the fluid in the container for discharging the fluid from a discharge side of the container at a predetermined rate, and a dispense control apparatus for controlling a pressure change type fluid discharge rate of the quantitative discharge device, said dispense control apparatus including a keyboard for inputting signals, a microcomputer for receiving said signals from said keyboard, an interface for receiving a digital pressure command signal from said microcomputer, an electropneumatic regulator for receiving an analog pressure command signal from said interface, a solenoid valve disposed in a middle part of an air channel of said electropneumatic regulator, and a pressure sensor for detecting discharge air pressure acting on the fluid, said pressure sensor being disposed at a location which permits detection of said discharge air pressure at the time when the fluid is being discharged from said quantitative discharge device, and said dispense control apparatus including means for simultaneously controlling said electropneumatic regulator and said solenoid valve so as to synchronously control both the pressure and duration of the discharge air pressure acting on the fluid being discharged.

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