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Monday, August 2nd 2010, 8:47am

Low-Head Drainage???

What is it?

What part of the sprinkler does the water leak out of?

How does a check valve stop it?
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Supreme Member


Tuesday, August 3rd 2010, 9:01am

Sprinkler heads are not sealed closed when they are in the "off" position. So if your system is installed on a hill, when the water is turned off, the water left in the pipes will drain out through the lowest installed sprinkler head.

A check valve keeps the water from flowing backwards through the pipes, and there is even special check valves that can even hold upto about 10psi to keep water from flowing through it in either direction (until the forward pressure exceeds the 10psi). Basically, these check valves function to prevent the water remaining in the pipes from draining out of the system when the valve is off.

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