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Distributed control system for a vacuum sewer system

  • US 9,828,757 B2
  • Filed: 01/25/2011
  • Issued: 11/28/2017
  • Est. Priority Date: 01/27/2010
  • Status: Active Grant
First Claim
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1. An apparatus for a vacuum sewer system comprised of a suction pipe having a first end that is connected to a sewage sump and a second end that is connectable to a vacuum source via a vacuum valve, the apparatus comprising:

  • sensors comprising at least one vacuum sensor to measure a vacuum in the suction pipe, the vacuum in the suction pipe being based, at least in part, on a height of sewage in the suction pipe;

    at least one processor to determine an air-to-liquid ratio through the vacuum valve by performing operations that comprise;

    determining a liquid flow through the vacuum valve based on a duration that a vacuum in the suction pipe is greater than a threshold; and

    determining a an air flow through the vacuum valve based on a duration following the vacuum in the suction pipe being below the threshold; and

    a solenoid valve for controlling application of vacuum or pressure to the vacuum valve based on the air-to-liquid ratio.

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