I am rebuilding my sprinkler system. The instructions for the electric
valve/vacuum-breaker units provide for installation of the valve 6" above
the sprinkler heads.
Anyone know why this is necessary? What would happen if I install the
anti-siphon valve below the level of the sprinkler head? Will the valve leak
if installed that way?
If I correctly understand the purpose of an anti-siphon valve, it
prevents backflow of dirty water into the house plumbing, if pressure
is removed from the supply side of the valve. It does this by allowing
water under pressure on the outlet side to drain. If your anti-siphon
valve is below the level of the sprinkler heads, this guarantees that
the valve will dump the water in the outlet pipe under a no-supply-
NOTE: I am a software engineer, not a plumber - I could be wrong.
Jerry (software engineer) is correct.
An anti-siphon valve prevents back flow of dirty water into your house
supply AND the water utility's pipes as well. The objective is to
protect the fresh water supply from contamination in the event of
pressure loss on the supply side.
A lot of sprinkler valve installations that I see are done
The anit siphon unit must be a MINIUMUM of 6" above the highest head
in the sprinkler circuit....be safe & give yourself a decent riseer on
check this out
but what does one do when the sprinkler circuit runs uphill away from
the sprinkler valve?
I've never done this type of installation...... but there much more
complicated back flow prevention devices that are probably required.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.