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JAFSVQ - Just Another Few Sprinkler Valve Questions

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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JAFSVQ - Just Another Few Sprinkler Valve Questions

Unread postAuthor: dongfang » Tue Jun 19, 2007 8:16 am


Did anybody try closing a sprinkler valve before the chamber was exhausted? I know it usually won´t make much sense to do so, but then again, my gun is not a usual design (the old Jet Gun in hybrids).
Will the diaphragm rupture or anything when closing with an 8 bar pressure differential still there?

My first and only valve is a jar-top type Rain Bird. The equalization thing through the diaphragm is very small (slow-close feature). Does anyone know whether it is ok to just remove it, leaving the hole it sat in? The idea is to have it close faster, and to fill the main chamber (slowly) through the eq hole, saving me from making a hole in the chamber.

Thanks for any feedback
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This is the equalization thing in teh diaphragm
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Unread postAuthor: noname » Tue Jun 19, 2007 9:44 am

Most sprinkler valves will close as soon as you close the pilot valve, if you have a big enough chamber and enough air. With a larger chamber and a paintball barrel, I can get one really strong shot (~700 fps), then another in the 350 fps range if I tap the blowgun really fast.
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Unread postAuthor: TurboSuper » Tue Jun 19, 2007 2:01 pm

I accedentally made the chamber on my pneumatic way too big. After I release the pilot valve, I can sqeeze it again woth a dull "phoot" sound as a result. So yes, as soon as you close the pilot, the pressure on top of the diaphragm will equalize and it will reseal.
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