Talk:Pressure vacuum breaker

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I was hoping to find out more about vacuum breakers as used in hot water geysers. As far as I know, these have the dual role of preventing water being siphoned from the geyser into the mains water supply, although this is better done with a non-return valve, and, they prevent a partial vacuum being created in the geyser if, for example, the water is drained out when there is no supply and/or the supply valve is closed. Some of the cheaper geysers I have worked on are lined with a fibreglass lining that collapses and perforates if the vacuum valve isn't working/fitted, resulting in a leaking geyser and all the accompanying problems.217.113.74.161 17:10, 15 June 2007 (UTC)