Quote(also, yea, I realized after the fact that ball valves are either on or off, been a while since I had a hydraulics class)No, a ball valve can be used to throttle flow anywhere from full off to full on and anywhere in between, just by the position of the handle/ball. A ball valve's main claim to fame is that it can be made to allow full flow restricted by only the piping size and line pressure. That is a 1/4" ball valve has a full 1/4" hole in the ball and therefore allows full potential flow in 1/4" piping systems. They tend to be the more expensive style of valve per size because of the precision machining required to make the ball and seat. Not sure if plastic ball values are common and if they carry a price premium also.Lefty
(also, yea, I realized after the fact that ball valves are either on or off, been a while since I had a hydraulics class)
An alternative to solenoid operated valves is motorised valves as used on heating systems, usually mains voltage, they are usually spring loaded shut and open when supplied with mains power :http://www.uk-plumbing.com/danfoss-randall-2-port-valve-hp22b-22mm-p-1396.html
I'm trying to find a electrically actuated water valve for a project.. something I THINK like this herehttp://www.amazon.com/Parker-Valve-4Z-B6LJ2-SSP-Stainless-Compression/dp/B001C13DJ6But preferably cheaper, that's obviously for an industrial applicationMy question is: Does anyone know of any search terms I could try to find more residential oriented ones?