I need to make a ball valve that will open with no manual force but by a motor of some sort to spin it and release water. how do i make a ball valve controlled by preferably a motor or other CHEAP device. I need to do this for less that 20$
It's a lot easier and cheaper to buy the valve at a hardware store than make it. You can probably get a motor and gear train from a hobby store. If it doesn't absolutely have to be a ball valve, you can get electric sprinkler valves from just about any home and garden supply. They're specifically designed to control water flow. Just hook it up to a power source and you're good to go. Addition: Just remembered, you can also get battery operated water control valves that connect between a faucet and a hose. I'm pretty sure they're ball valves internally. Prices vary, so shop around. Depending on how fancy you want it to be, they go for about $5.00 and up.
