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Help modding a rain pro sprinkler valve

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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Help modding a rain pro sprinkler valve

Unread postAuthor: Dubz » Wed Oct 26, 2011 8:40 am

Hi guys I've read numerous posts in regards to modding sprinkler valves. But none have mentioned the rain pro valves. They have just a solenoid in the middle that's it, I have replaced the solenoid with a blow gun trigger everything fits all sweet problem is air keeps leaking through the barrel, I've tried grease,oil, cleaning it... Same prob, what can I do other than buy a different valve?
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Last edited by Dubz on Wed Oct 26, 2011 9:17 am, edited 1 time in total.

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Unread postAuthor: wyz2285 » Wed Oct 26, 2011 8:47 am

open it, clean all the parts and make sure they are all in place. any picture of the valve?
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Unread postAuthor: dewey-1 » Wed Oct 26, 2011 8:57 am

There is a very small hole in the output side of the valve. (barrel side)

Think about how a sprinkler valve works with a solenoid on it.

Where does the "pilot side" air/water get vented?
It has to go somewhere for the diaphragm to open.

Put epoxy in that small hole that goes to the barrel side.

This has been mentioned in the sprinkler valve modifications along with removing the filter that is mounted on the diaphragm.
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Unread postAuthor: Dubz » Wed Oct 26, 2011 8:58 am

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Unread postAuthor: dewey-1 » Wed Oct 26, 2011 9:39 am

Make sure the manual "bleed" lever is closed.
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Unread postAuthor: Dubz » Wed Oct 26, 2011 10:07 am

there isn't a manual bleed lever :? just a metal rod that goes through the guts, and no extra holes in the grommet seal on the lid
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Unread postAuthor: dewey-1 » Wed Oct 26, 2011 10:43 am

Can you post a picture of how the blowgun is installed into the jartop?

So you removed the solenoid and the bleed lever.
This may still leave the bleed hole/solenoid vent open.

Which picture is the barrel side? I think it is the last picture due to the small hole/tube in the middle of the opening.

This may explain things better.

http://www.thehalls-in-bfe.com/GGDT/lib ... 1_mod.html
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Unread postAuthor: Dubz » Wed Oct 26, 2011 11:08 am

last pic ( Snapshot_20111026_4.JPG) i have it chamber side, though i did have it barrel side with same probs. i just putty up the bleed holes in Snapshot_20111026_2.JPG, going to see if it works....
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Unread postAuthor: dewey-1 » Wed Oct 26, 2011 11:21 am

There are typically arrows molded into the sprinkler valve body that indicate the the direction of flow.

Make sure you have it installed so the barrel is the output side.
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Unread postAuthor: Dubz » Wed Oct 26, 2011 11:26 am

okay, i flip Snapshot_20111026_4.JPG to barrel end and seal the "bleed" holes in the lid and it holds about 130 psi.....fixed :D now no quick busts when squeeze the trigger, air just comes out real slow, its not blocked, should i drill out the hole bigger?
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Unread postAuthor: pneumaticcannons » Wed Oct 26, 2011 11:43 am

either get a new blowgun or yes, drill the hole out. Why did you get a jar top lol.... next time get a normal one, their really easy to mod.
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Unread postAuthor: Dubz » Wed Oct 26, 2011 11:54 am

thats the only one they had and im too impatient to wait till next monday lol
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Unread postAuthor: dewey-1 » Wed Oct 26, 2011 12:01 pm

This is the vent that need to be blocked not the other end.
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Unread postAuthor: dewey-1 » Wed Oct 26, 2011 12:19 pm

Dubz wrote:okay, i flip Snapshot_20111026_4.JPG to barrel end and seal the "bleed" holes in the lid and it holds about 130 psi.....fixed :D now no quick busts when squeeze the trigger, air just comes out real slow, its not blocked, should i drill out the hole bigger?


Which hole?
You need to be a little more specific.

Are you trying to say that there is not a large flow out of the barrel and a only a small amount coming out of the blowgun?
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Unread postAuthor: Dubz » Wed Oct 26, 2011 1:22 pm

:D all fixed the hole on the lid just had to be bigger thanks for the help
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