SPRINKLER TALK FORUM - You Got Questions, We've Got Answers

Hi-

I've got a small sprinkler system - only one valve - that wasn't installed by me. (a mistake I won't make again).
It's not working, and I'm trying to diagnose why. The valve won't shut off, regardless of how it's turned on.

I shut off the water at the supply, then turn it back on. sprinklers are not running. If I turn them on, either using the timer or the manual knob on top, they come on but cannot be turned back off without shutting down the supply again.

Any suggestions for how to trouble shoot? I don't suppose anyone has a diagram of the internal assembly of the unit? I fear I may be putting it back together incorrectly (in particular, does the metal cylinder for the solonoid go in with the pointy end up (towards the spring) or down?

Thanks!

-andy