Are you sure its not shutting off? sometimes it takes a little bit for the gas to finish escaping from the lines. Mine probably produces bubbles a good minute or so after the valve closes off.
There could be a little dirt or something in the valve causing it to not close completely allowing some gas to seep through.
Could be something wrong with the timer that it's still allowing voltage to go through thus keeping the valve open. Try putting a light on the timer and see if it actually goes off like it should. Or, if you have a voltmeter you can test it.
It stays on, I've left it thinking it would shut off snd 5 hours later it was still running full. My timer has on, off and auto. When I switch it to off, the solenoid clicks. When it's on auto it won't
It's on my second timer, it works fine when connected to other things. It will shut off when I switch the timer to off manually.
It sounds like your timer still has enough voltage going through it to allow the solenoid to be open in the auto function. Might have to try a different timer or continue to manually turn it off. Sorry I cant help you out anymore than this.
Wouldn't matter if the outlet was reversed polarity or not. A solenoid is a coil of wire that when is energized creates a magnetic field that pulls in an armature.
Basically your timer(s) are messed up, not the solenoid. If your solenoid closes when you unplug it, but doesn't when your timer turns off, you need a different timer. It's not your solenoid. I have 20 dollar digital timers that I use, and they work great. Sometimes you gotta spend the money.