Patent ID: 7544253
Filing Date: 2009-06-09
Classification: B08B,E01C

Abstract:
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 the heated repair material 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 for return to the flush tank.