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Question on a new way of modding a sprinkler vavle

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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Question on a new way of modding a sprinkler vavle

Unread postAuthor: glass_05 » Wed Jul 08, 2009 12:33 am

i have modded many sprinkler valves before, but my question is if its possible to fill the chamber by using the same modded sprinkler valve part. let me explain

can you use sprinkler valve like this:
Image

and then put a tee on it instead of just the barb. that way you can fill it up and trigger it from the sprinkler valve. here is a similar setup, but i know this isnt with a rainbird
Image

want i basically want to do is be able to use the sprinkler valve mod to fill and trigger the gun.
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Unread postAuthor: Technician1002 » Wed Jul 08, 2009 12:48 am

It can be done. The EQ port in the diaphragm is small so the fill time will take a while. The hazard with filling with the pilot side is the accidental discharge when you disconnect the air hose. For these reasons, this is why filling from the pilot is not recommended.
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Unread postAuthor: UKSGC » Wed Jul 08, 2009 1:49 am

You could use a check valve and eliminate the chance of an accidental launch on hose removal.
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Unread postAuthor: Technician1002 » Wed Jul 08, 2009 2:02 am

UKSGC wrote:You could use a check valve and eliminate the chance of an accidental launch on hose removal.


True, for additonal $.. and that fixes just one of the problems.
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Unread postAuthor: inonickname » Wed Jul 08, 2009 2:16 am

The fill rate will be slower, but this will eliminate the problem of fill honking. If you've ever filled a sprinkler valve very fast the pressure overcomes the spring and opens the valve, make it honk and waste air.
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Unread postAuthor: MRR » Wed Jul 08, 2009 10:50 am

Look at the 2nd picture. With that setup there shouldn't be a problem with accidental firing.

At least if you always remember to close the ball valve before disconnecting the fill hose.

There was a post a while ago with the idea of bypassing the air input...
fill valve -> sprinkler -> check valve -> hose -> chamber
...for a faster refill without honking.

Sounds quite good to me but I don't know if its feasible.
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Unread postAuthor: Hubb » Wed Jul 08, 2009 10:55 am

I modify most of my sprinkler valves to fill from the pilot side. It actually seems to perform better doing it that way to me.
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