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Valve modding problem

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Valve modding problem

Unread postAuthor: watto » Sun Sep 23, 2007 7:41 pm

Ive modded a holman sprinkler valve, the same as the one in this tutorial http://www.spudfiles.com/forums/modding-the-wrong-type-of-sprinkler-valve-t3821.html

But when I blow into the right end and the pipe tap is covered, air still leaks slowly past the diaphragm. What do you think I should do. the pipe tap is well and truly sealed, and I've left the solenoid on so It cant be that hole, should I put some lube inside it or something?
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Unread postAuthor: BigJon » Sun Sep 23, 2007 7:48 pm

make sure that the diaphram inside is clean or else it won't seal right.
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Unread postAuthor: thespeedycicada » Sun Sep 23, 2007 7:55 pm

here are some problems i can think of.One did you leave that little rod with the spring in the solenoid? if not it will leak.Two are you blowing through the right hole the arrows should be facing the barrel and be pointing away from the chamber or your mouth when testing if not it will leak.And finally did you leave the spring in there mine would not work without it.Hope this helps.
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Unread postAuthor: watto » Sun Sep 23, 2007 8:29 pm

Yeh the rod and spring are still in and im blowing in the right direction, the diaphragm is new so it's all clean.

Just another thing I noticed, when you are not covering the pipe tap, Is it meant to be hard to blow into? I'm assuming once it's attached to the chamber and has a lot of pressure behind it then then diaphragm will move all the way up, is that right?
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Unread postAuthor: thespeedycicada » Sun Sep 23, 2007 8:38 pm

no it shouldnt be to hard to blow into ive never used those valves before so without some pics of the internals and externals im out of ideas.
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Unread postAuthor: mopherman » Sun Sep 23, 2007 8:50 pm

MY sprinkler does not seal when I blow into it. It just needs more pressure behind it.
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Unread postAuthor: windshrike » Sun Sep 23, 2007 8:55 pm

Dang mopherman, you beat me to it :x .
Watto: If you already know this, just bear with me.
A diaphragm valve uses a piece of rubber(thats the diaphragm) between two areas of pressurized air, and when one area is exhausted, the pressure difference moves he diaphragm, releasing the air in the other area. However, if the pressure is not great enough to push the diaphragm with enough force to seal against the other area of air, then a small amount of air will leak past, hence your problem.
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Unread postAuthor: watto » Sun Sep 23, 2007 9:37 pm

you guys are so smart, thanks
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