The greatest threat to your irrigation system, during initial start-up, is water hammer. You may already know about water hammer if you have 'clanging' plumbing in your house. That knock' is produced by a surge of air pressure caused by the rush of water suddenly flowing into an empty pipe, giving the air in the pipe no time to escape.
More: http://www.hometips.com/diy-how-to/yard-irrigation-spring-startup.html
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