Does anyone know of a servo valve that could be setup to start and stop the flo

David Z

Does anyone know of a servo valve that could be setup to start and stop the flow of water through 1/4 inch tubes (around that size) based on control signals from a basic stamp? I tried to search online and only found industrial control valves for gases. Any help would be most welcome!

-david z

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Post Edited By Moderator (Chris Savage (Parallax)) : 5/23/2008 3:50:25 PM GMT

MikeS

David-z,
You might try these folks. Here is one that can be controlled by 12v. Stamp can do it, but not directly.
http://www.clarksol.com/html/prodspecs1365Valve.cfm
MikeS

erco

Lots of solenoid-op sprinkler valves at Home Depot to choose from. Most of the traditional Rainbird-type systems are 12 volts, I think. You can fabricate an adapter for 1/4" line.

But there are also inline battery-powered solenoid valves that operate off of 3-5 volts, such as http://cgi.ebay.com/garden-watering-timer-control-sprinkler-timer-lawn-NEW_W0QQitemZ180242408387QQihZ008QQcategoryZ75672QQssPageNameZWDVWQQrdZ1QQcmdZViewItem·

This one looks to be 4.5 volts (3xAA), so I'm sure you could power it off a common 5-volt supply to power your stamp, possibly using a diode to drop the voltage to ~4.5 V if necessary.·You'll bypass all or most·of the control electronics·to use your Stamp. If you're clever, you can probably use the existing motor driver transistors in the valve and interface your Stamp output pin directly to it.

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·"If you build it, they will come."

Larry

the Rainbird® valves and most sprinkler valves ostensibly run on 24v AC, so they are easy to run with a solid state relay. Radio Shack used to have one in their parts drawer that worked fine. I have made them work at 18v AC , and at 18v DC. Some say the life of the solenoid will be shorter on DC, but my application is not continuous duty.

They are usually made to open and close slowly, so keep that in mind.

I have run water through the commercial air valves usually seen on CNC machinery and they seem to work fine with liquids. some are even rated for that, I think. They are usually 24v DC, but will run on a bit less sometimes. They'll turn on and off much faster, so if the application is a dancing water fountain, They are a better choice.

Look for industrial surplus houses. You can sometimes find them pretty cheap. A once got a board full of 'em (14) with the manifolds for about $25.
Your deal may vary. They cost about $65 ea. new. One caveat, they aren't 1/4", usually, but smaller. you'll spend a bit on adapters.


www.rainbird.com/landscape/products/valves/peb_series.htm

Post Edited (Larry) : 5/19/2008 9:54:58 PM GMT