I'd like to make controller for some water valves. This is to automatically change the water in my duck pond. Currently, the drain is a 1 1/4" line with a manual valve (the sort you buy cheap at Home Depot), and the filler is a garden hose attached to a float valve.
Sparkfun has a 3/4" 12v solenoid valve for $8, so easy peasy for the shutting the hose off while draining. Is there somethign that's not ridiculously expensive for the 1 1/4" valve? Rainbird has a 1 1/4" brass valve for $141, so forget that. They have a 1" plastic valve for around $20 so that's reasonable, but I I'm concerned if I stepped down it would cause it to clog up (feathers, leaves, feces, etc). A couple potential issues with the valves though: -Since this is a drain, it's gravity feed which means not much pressure. Are these irrigation valves like the Sparkfun 3/4" valve which only open if under pressure? -The irrigation valves are 24AC, but I read in one place that they work fine under 12v DC as long as you use a current limiting resistor. Can anybody confirm that 12VDC would actually work?
Anybody know what I could use for a 1 1/4" (or larger) valve that's not crazy expensive, and works under gravity?