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Sprinkler Valve Troubleshooting

A place to ask general spud cannon related questions.
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Sprinkler Valve Troubleshooting

Unread postAuthor: Vincente » Wed Feb 22, 2006 10:46 pm

The sprinkler valve on my tennis ball cannon won't close. The air goes right through the valve.

These are pictures of the cannon, the valve with the first blowgun setup (no bleed screw), the valve with the second blowgun setup (bleed screw), the valve itself, the valve without the diaphram, and the valve and the diaphram.

Image

Image

Image

Image

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I think it might have something to do with the white thing on the diaphram.

Please help! Anything would be appreciated.
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Last edited by Vincente on Thu Feb 23, 2006 5:20 pm, edited 1 time in total.

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Unread postAuthor: theregoesthewindow » Thu Feb 23, 2006 12:29 am

Did you put the spring in? That might be the problem. The white thing is the equilization port I think. The Wiki recomends that you clean out the valve and check for any plastic chips or something else clogging the valve.
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Unread postAuthor: Vincente » Thu Feb 23, 2006 5:49 pm

The spring is in, and the valve isn't clogged.

Are you sure that's what the white thing is?
Here are two pictures that show the white thing (I wish I knew what it is).

http://img442.imageshack.us/img442/723/img38959fp.jpg

http://img452.imageshack.us/img452/1858/img38902bm.jpg

BTW, the valve I'm using is a Rainbird CP-100 for anyone who has ever used one before.
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Unread postAuthor: theregoesthewindow » Thu Feb 23, 2006 8:30 pm

I haven't used that exact type of valve before but the wiki mentions a white thing here
http://www.spudfiles.com/spud_wiki/index.php/Sprinkler_valve_modification
but I haven't worked with either of the valves, so maybe I shouldn't be talking.
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Unread postAuthor: Vincente » Thu Feb 23, 2006 8:40 pm

That's the white peice! Thanks a lot, you just explained one of my problems. I'll just remove the white peice.

Now all I need to know is why my valve won't close. When I try to pump it up (pressurize it), the air goes right through the valve and out the barrel.
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Unread postAuthor: nicholai » Thu Feb 23, 2006 9:33 pm

well, for one unscrew the solenoid and plug up the hole with some epoxy, then make sure your diaphragm has no rips tears or obvious sign of damage or manufacturer faults. Also make sure your blowgun mod isnt leaking at all (fill the chamber with water/air and pressurize, look for wet bubbly leaks)

im not 100% sure but i think you can remove the flow control knob and thread the blowgun directly into that instead of the side.
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Unread postAuthor: King-o-PVC » Thu Feb 23, 2006 9:38 pm

u might not have high enought pressure going in, u need to get a good bit of pressure on it quick or it wont hold
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Unread postAuthor: Shrimphead » Thu Feb 23, 2006 11:25 pm

Ya, King-O is right, I heard sprinkler valves need at least 20 psi to seal the diaphragm.
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Unread postAuthor: nicholai » Fri Feb 24, 2006 5:55 am

larger air chamber tanks forgetting to replace the spring, and damage are the most common reasons why a diaphragm wont seal
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Unread postAuthor: Vincente » Fri Feb 24, 2006 5:44 pm

Thanks a ton, guys.

Because of your help I finally got it to seal and my cannon works like a charm.
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Unread postAuthor: MadSkillzMan » Wed Apr 05, 2006 12:01 am

i know this threads old, BUT

i have the same valve, and im going to do a coaxial piston gun, and im going to have the same problem

What did you do exactly? And where could i get a bigger spring if needed? or could i just stack something under it to give it more push?

and can i get a yay or nay on running the blow gun thorugh that hole on the top? the how to on modding valves says it wont work
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Unread postAuthor: Shrimphead » Thu Apr 06, 2006 9:55 pm

You won't need a bigger spring, the one that's built into will work fine. The problem is that sometimes when people mod their valves, they forget to put the spring back in.
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Unread postAuthor: sam_516 » Thu Apr 06, 2006 10:29 pm

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turn it into a pneumatic modded sprinkler valuve it takes longer to reload but i have had no problems with myn and my gun kicks arse
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