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Method and apparatus for flushing asphalt feeding devices

  • US 20080035177A1
  • Filed: 07/18/2007
  • Published: 02/14/2008
  • Est. Priority Date: 07/20/2006
  • Status: Active Grant
First Claim
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1. For use by a wheeled unit for repairing roadway surfaces with a heated repair material, delivered from a storage tank through a first valve at an output of the storage tank, a feed line and at least a second multi-position valve to a mixing and dispensing head, a method for clearing and flushing the feed line, comprising:

  • a) moving the first valve to a first position coupling the feed line to the storage tank;

    b) moving the second valve to a blowout position to couple a pressurized air line to the feed line, causing asphalt in the feed line to return to the storage tank;

    c) moving the first valve to a second position decoupling the storage tank from the feed line and coupling the feed line to a flush tank containing a cleaning agent under pressure; and

    d) moving the second valve to a flush position decoupling the air line from the feed line and coupling the feed line to a recovery tank, whereby cleaning agent from the flush tank flushes the feed line and is collected in the recovery tank.

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