Pipework efficiency through AVK air valves In line with the Expect...AVK promise, Graham Charnley, AVK UK Product Manager - Non-Revenue Water, was contacted to identify a solution to a private wastewater system in Yorkshire, England. The pump supplier, Harroquip Pump Systems, was experiencing a problem with the pipework not operating as efficiently as it should; the installed ball valve jamming shut and, as a result, the pumps to were unable to move the waste material to a holding tank some 200 meters away. On examining the system and the existing air valve installations, it was apparent that the air valves were not operating properly; they were being blown shut and were unable to open again during negative pressure symptoms. The failure of these valves caused an over run of energy in the

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