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Leo Ladziske



Wednesday, April 23rd 2014, 10:38am

Check Valve

Where should a check valve be installed to prevent irrigation water from entering home water. What type check valve should I use? Thank you.


Supreme Member

Posts: 5,287

Location: Metro NYC


Thursday, April 24th 2014, 8:57am

a check valve is meaningless - standards go way way higher than that - most states classify the water in a lawn sprinkler system as toxic, and require a toxic-rated backflow preventer to isolate a lawn sprinkler system from its source water

that comes down to having a Pressure Vacuum Breaker (PVB) in the supply plumbing, for a property where it can be located higher than any sprinkler head that it feeds - if the property slopes uphill from the house, or water source, the required toxic-rated backflow preventer becomes the more costly Reduced Pressure Zone (RPZ) device

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