I know most of the stuff discussed on this forum is indoor plumbing related, but I'm pretty sure some of you deal with sprinkler plumbing issues.

The other night our sprinkler controller box timer in the garage turned on the sprinkler to one of the regions in my yard as usual. The problem is, the valve didn't shut off. I had to turn it off manually at the solenoid valve outside in the yard. Obviously there is an electrical connection to that valve from the controller box as it went on. Any idea why it wouldn't go off automatically? Maybe the valve diaphragm failed during the turn on part?

Thanks.

When the timer energizes the solenoid, a piston in the solenoid opens a small port, that bleeds off water from the topside of the diaphragm. The incoming water pressure is then greater on the underside of the diaphragm and the diaphragm raises to allow water to flow through. If there is no electricity going to the solenoid, then there could be a stuck piston or debris caught in the piston seat, preventing the bleed water from shutting off. I would unscrew the solenoid, turn the water on and try and flush out any debris. If this doesn't work and you have another similar valve, try swapping solenoids and see if the problem follows the solenoid or valve housing.

I agree. Debris in the solenoid. Solenoids usually default, closed.

Best Wishes

The controller turns the valve and and allows it to turn off, but the actual shut down mechanism is in the valve so it if did not shut off, SOMETHING, not necessarily the diaphragm, failed.

much more common is a split diaphragm or cracked "relief valve" on the diaphragm.

Thanks to all.



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