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I'm looking for an electric water valve for a DIY project. I need to be able to close it partially so as to control the water flow rate. The exact details of how to control it are not important; I'm sure I can build the necessary circuitry.

Could someone please recommend one?

The only valves I find are either huge industrial valves or unbelievably expensive (£500+) lab valves.

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Found some valves for approx €80 plus delivery at clippard.com/store/byo_electronic/byo_proportional_valves.asp –  romkyns Dec 10 '10 at 18:08
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up vote 3 down vote accepted

What you're looking for is called a proportional valve and they're typically not cheap. Here's a series that should do what you want from ASCO, and I was able to find it for sale online for US$316 (as of today). I'm not sure if that price includes the PWM controller module or not, or how necessary that module is.

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Hmm, thanks for this. Spent another hour searching knowing the proper name for these valves, and they are indeed expensive (in addition to being rare and hard to find). I think I'm best off grabbing a cheap tap-style valve, a couple of metal gears and a strong stepper motor... –  romkyns Dec 10 '10 at 17:48
    
That would definitely qualify as doing it yourself! –  Mike Powell Dec 10 '10 at 18:25
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