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Help with lubricating diaphram in Rain Bird 100-DV 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 with lubricating diaphram in Rain Bird 100-DV valve

Unread postAuthor: zx300_ » Mon Nov 20, 2006 8:24 pm

First of all, I was told that modding the valve doesn't get rid of the 'honk', instead they told me it needed to be lubricated. So, today I bought some valvoline grease with white lithium based stuff in it. I applied to to the whole underside of the diaphram, and my valve still honks. Any suggestions?
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Unread postAuthor: King_TaTer » Mon Nov 20, 2006 8:30 pm

well my suggestion isn't much but it is something :? . i would either try a different lubricant/grease or conjure up a differnt type of diaphragm
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Unread postAuthor: jrrdw » Mon Nov 20, 2006 8:30 pm

Are you getting good shots or wimpy shots?
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Unread postAuthor: zx300_ » Mon Nov 20, 2006 11:02 pm

It's hard to say, this is my first pneumatic, so I don't really know what a 'good' shot is. But in my opinion I think its a little wimpy.

Edit: I was trying the lubricant because I would be happy if the cannon didn't make such a loud noise, and so that I wouldn't need to make the pilot valve larger ($$).
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Unread postAuthor: zx300_ » Wed Nov 29, 2006 5:32 am

Bump...

Has anyone here stopped the honk on a rainbird? If so, please inform me how you did it....
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Unread postAuthor: jrrdw » Wed Nov 29, 2006 6:46 am

I've read a few different reasons in hear for why valve's honk. I think the most logical is that after the projectile leaves the barrel, there is still low amounts of pressure leeving the chambers through through the valve, vibrating the diaphram makeing the honk noise, (in my own words).

Difference whimpy shots, and strong shots -- a strong shot will have some recoil and make a fairly loud pop sound, (probly 30psi and over). A whimpy shot will sound like a fart leeving the barrel, (with no cheek flap).

Maby some valves will just honk no matter what! One more thought, is there a bleeder flip swith, if so make sure it's off. Hope this helps.
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Unread postAuthor: squeaks » Wed Nov 29, 2006 8:21 am

I thought the honk came because air is still in the pilot and chambers and the diaphrahm vibrates between them. You could fix this problem by modding the valve, or if it is already modded, use a shorter section of hose or use a better valve then a blowgun.
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Unread postAuthor: Recruit » Wed Nov 29, 2006 10:12 am

Umm would removing the spring if it has one help?
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Unread postAuthor: jrrdw » Wed Nov 29, 2006 10:32 am

Squeaks is echoing the post just above his, (mine), except the hose part, good add on.

The spring probly helps hold it still, if there is one in there.
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Unread postAuthor: squeaks » Wed Nov 29, 2006 4:17 pm

Well, I was saying, or rather attempting to say, that the honk actually means the valve isn't opening completely because there is still air behind. Therefor, remove the honk, valve works better(for those of us that didn't know that already).
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Unread postAuthor: zx300_ » Wed Nov 29, 2006 6:17 pm

Hmmm, I think I may have to modify it after all then. The valve has a plastic bleed screw, so I should make sure that it is as tight as I can make it?
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Unread postAuthor: SpudStuff » Wed Nov 29, 2006 6:21 pm

The valve isn't honking because it isn't lubercated! You need a bigger pilot valve. Try modding the valve that solves the problem.
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Unread postAuthor: zx300_ » Wed Nov 29, 2006 6:48 pm

It was just I read somewhere else that the diaphram was meant to be lubricated by the water which helps it sit back in place...
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Unread postAuthor: squeaks » Wed Nov 29, 2006 7:05 pm

The lubricating doesn't really matter with a diaphrahm. It's when you have o-rings on a piston that you have to lubricate things.
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Unread postAuthor: nicholai » Wed Nov 29, 2006 8:23 pm

the flow control valve should be opened as much as possible, that limits diaphragm travel which could help with the honking. Modifying this valve is easy through the flow control screw hole, there is a No Drill mod tutorial on this site for that model.
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