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Diaphram gets stuck down (modded 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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Diaphram gets stuck down (modded sprinkler valve)

Unread postAuthor: Ublind » Sun Aug 08, 2010 10:02 pm

I created a pneumatic spudgun with a 3/4 in. LawnGenie sprinkler valve on it (with guide rod.) Because of the guide rod, I inserted the blowgun beside the guide rod, which was on the edge of the innermost hole. My gun worked perfectly until recently, shooting the handle of a shovel through 1 in wood! Now everytime I shoot the diaphragm gets stuck down, so the air just leaks by it until I open up the valve, unstick the diaphragm, and reassemble the darned thing. Can anyone help me with this problem? Can I just remove the guide rod?
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Unread postAuthor: clemsonguy1125 » Sun Aug 08, 2010 10:24 pm

Don't remove the guide rod, did you lose the spring at any point?
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That is all.
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Unread postAuthor: Ublind » Sun Aug 08, 2010 11:10 pm

The spring is still on and I tried stretching it out so it pushes more on the phram, but no dice. :cry: My first gun, BTW.

EDIT: I'm out for the night, i'll check back tomorrow
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Unread postAuthor: hi » Mon Aug 09, 2010 12:28 am

You might try just a little bit of grease. I have only worked with valves without a valve guide, but to me it sounds like a bit of bearing/lithium grease work work well.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: Hubb » Mon Aug 09, 2010 6:04 am

hi wrote:You might try just a little bit of grease. I have only worked with valves without a valve guide, but to me it sounds like a bit of bearing/lithium grease work work well.
I was going to suggest cleaning it as well. Also, make sure that the spring is not binding up when it is being fired.
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Unread postAuthor: Pyro Ninja » Mon Aug 09, 2010 8:27 am

I had the same problem with the diaphragm not reseating properly and constantly had to open the valve and reseat the diaphragm manually.

I found out that the bottom of the diaphragm was catching on a tiny lip where it seats, so I sanded the lip off and smoothed it over with a fine grit abrasive paper. After I removed the lip it worked consistently well.

And yes, don't remove the guide rod as than the equalisation hole will be too large.
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Unread postAuthor: Ublind » Mon Aug 09, 2010 7:28 pm

I already put some grease on it, so I cleaned the diaphram and stretched out the spring so more pressure is pushing up on the phram and now it works like a charm! Thanks for your help!
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