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Thursday, November 1st 2012, 12:52pm

25 foot slope, leaking water from controller valve when turned off

Hello I have 3 zones on a 25 foot slope (2 zones MP rotators, 1 zone drip irrigation). When the sprinkers are working, I dont' see any leaks from the control valves, but when I turn off the zones on the slope I notice water leaking from the control valves. I have Hunter PRS40 sprinkler risers with check vavles so I don't think the problem is with the sprinkler heads. I am guessing that the main line after the controller valve leading up the slope, is draning back down to through the control valves when the system is off. I do notice air coming out of the sprinkler heads when I turn on the zones to the slope.

Can I install an additional check valve after my control valve to prevent this? Or will this reduce my pressure too much (since this is a main line feeding the zones on the slope?)

I was looking at this product:
It states its good for up to 30 feet elevation change. Or is there a better solution?


Supreme Member

Posts: 5,288

Location: Metro NYC


Thursday, November 1st 2012, 1:47pm

If this is the system with the antisyphon valves, you should hold off on asking more questions until that gets sorted out first.

In the general sense, heads with built-in check valves are the remedy for low head drainage. That remedy is limited, however, and large elevation differences in a property might call for a design that does not use antisyphon valves, because those must always be free to drain out through the sprinkler heads.

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