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3/4" diaphragm 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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3/4" diaphragm valve

Unread postAuthor: jackssmirkingrevenge » Wed Jan 02, 2008 11:32 am

Found this little blighter at work which seems to correspond to the Gemü model 610, well made bit of kit. The preload on the springs is tremendous, I doubt I'll actually find a use for it but just thought I'd share.
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Unread postAuthor: elitesniper » Wed Jan 02, 2008 12:13 pm

are those unions on the side?
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Unread postAuthor: jackssmirkingrevenge » Wed Jan 02, 2008 1:16 pm

Yeah, found them with the valve.
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Unread postAuthor: rna_duelers » Wed Jan 02, 2008 7:16 pm

Nice find,wonder why there is two strong springs for such a small valve.Not sure how one would go about moding it.
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Unread postAuthor: Acdcmonkey1991 » Wed Jan 02, 2008 7:19 pm

maybe get a less strong spring and use a 1/8 in ball valve
edit: sorry to get off topic but I just noticed that we have "welcomed" almost 3000 new members in the past 3 months at the most.
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Unread postAuthor: sniperjosh » Wed Jan 02, 2008 7:40 pm

That valve could be modded quite nicely imo :O. Have a play around with it, would be great for a compact small bore.
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Unread postAuthor: King_TaTer » Wed Jan 02, 2008 7:59 pm

Ya pretty sweet, is there any indication of a preassure rating?
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Unread postAuthor: MrCrowley » Wed Jan 02, 2008 8:02 pm

If my eyes read that blury label correctly, it's only a 15mm valve?
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Unread postAuthor: King_TaTer » Wed Jan 02, 2008 8:16 pm

15 millimeter = 0.5905511811 inch

hmm who knows, but seeing as JSR has it, he's probably right. but cheers for trying to read it, i didnt even try...
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Unread postAuthor: MrCrowley » Wed Jan 02, 2008 8:24 pm

I wasn't replying to your post King_tater, just stating that's it's a small valve.

I think I see DN15 PN5 PVC

Which simply means... Diameter 15mm, Pressure rating 5BAR made from PVC.

5 BAR is about 72.5PSI :(

So there's your answer King_Tater, 72.5psi it's rated to... I think.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 03, 2008 12:15 am

DN15 PN6 PVC - not very useful at only 6 bar eh?
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Unread postAuthor: MrCrowley » Thu Jan 03, 2008 12:21 am

Ah it's a 6, damn my eye sight :)

I thought it was between 5 and 8, looked closer to 5. Now when looking at it, it's clearly a 6.

I don't think anything rated under 18BAR is much use to you JSR :wink:
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 03, 2008 12:23 am

MrCrowley wrote:I don't think anything rated under 18BAR is much use to you JSR :wink:


Besides, off the shelf components?! pffft! what would the neighbours think? hehe
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Unread postAuthor: Ragnarok » Thu Jan 03, 2008 1:54 pm

King_TaTer wrote:15 millimeter = 0.5905511811 inch

Why quote it to that accuracy?

Firstly, it's probably only nominally 15mm - the seat diameter could be a mm or more either way.
Secondly, it wasn't made to that accuracy in the first place, nothing can be.
Thirdly, you can't measure to that accuracy, because it won't be a perfect circle of a single diameter.
Finally , the heat expansion or contraction from a change in temperature of just a few degrees <sup>o</sup>C will make the last 5 or 6 dp completely pointless.

0.6 would have been fine, 0.59 would have been better, 0.591 would have been overkill, but acceptable - what you did was both too much.

Not to get at you, but as a general rule, you should never quote to more significant figures than your original data - one more is acceptable though.

This post was brought to you by the association of pedantic engineers who've not slept properly and have eaten too much sugary stuff.
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Does that thing kinda look like a big cat to you?
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