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Fluid metering and mixing device having inlet and outlet valves

  • US 4,161,264 A
  • Filed: 06/17/1977
  • Issued: 07/17/1979
  • Est. Priority Date: 06/17/1977
  • Status: Expired due to Term
First Claim
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1. A device for metering a fluid at a predetermined flow rate, comprising:

  • a first fluid chamber having a predetermined volume;

    a first set of flexible, elongated fluid inlet and outlet conduits communicating with said first fluid chamber;

    a second fluid chamber having a predetermined volume;

    a second set of flexible, elongated fluid inlet and outlet conduits communicating with said second fluid chamber;

    a first flexible clamp tube having an externally accessible inlet end and a restricted terminating end, said first clamp tube overlying the inlet conduit of said first set and the outlet conduit of said second set;

    a second flexible clamp tube having an extenrally accessible inlet end and a restricted terminating end, said second clamp tube overlying the outlet conduit of said first set and the inlet conduit of said second set;

    a first pair of rigid surfaces spaced apart by the overlying portions of said first clamp tube and said inlet and outlet conduits by a fixed distance selected such that pressurization of said first clamp tube collapses the walls of the inlet conduit of said first set and the outlet conduit of said second set thereby preventing fluid flow into said first fluid chamber and from said second fluid chamber;

    a second pair of rigid surfaces spaced apart by the overlying portions of said second clamp tube and said inlet and outlet conduits by a fixed distance selected such that pressurization of said second clamp tube collapses the walls of the outlet conduit of said first set and the inlet conduit of said second set thereby preventing fluid flow out of said first fluid chamber and also preventing fluid flow into said second fluid chamber; and

    control means alternating between first and second cycles, said control means pressurizing said first clamp tube while depressurizing said second clamp tube during said first cycle thereby allowing fluid to fill said first fluid chamber and allowing fluid to drain from said second fluid chamber, and said control means depressurizing said first clamp tube while pressurizing said second clamp tube during said second cycle thereby allowing fluid to drain from said first fluid chamber and allowing fluid to fill said second fluid chamber such that the flow rate of fluid from said metering device is a substantially constant predetermined value.

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