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qev valve/threads

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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qev valve/threads

Unread postAuthor: lojtoy » Thu Jan 14, 2010 1:58 pm

hi

I am planning to order a qev valve from America because they are too expensive around here. But i was just wondering if the threads on the qev valve would go together with the European(possibly Swedish) pipefittings and thread dimensions?
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 14, 2010 2:21 pm

Surely you can find a European source?
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Unread postAuthor: psycix » Thu Jan 14, 2010 2:25 pm

In the US they use NPT thread.
In Europe we use BSP thread.

You should really try to find your a closer source.
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Unread postAuthor: MrCrowley » Thu Jan 14, 2010 5:01 pm

Assuming Australia/New Zealand BSP works with European BSP, which I don't see why the hell it wouldn't, you'll be fine with an American QEV.

I've used American fittings in conjunction with many Australia/New Zealand BSP fittings just fine. Sometimes the fittings thread together a little to easy or a little to hard but it's nothing teflon tape can't fix and i've never had any problems beyond that.
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Unread postAuthor: jackssmirkingrevenge » Thu Jan 14, 2010 5:03 pm

BSP is BSP, there shouldn't be a difference between Aussie supplies and European ones. Plus adapters are always available.
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Unread postAuthor: psycix » Thu Jan 14, 2010 6:56 pm

Sometimes you can thread NPT into BSP, or at least for a few turns. It isn't reliable or leakproof, but as Crowley said, with a lot of PTFE tape some combinations can be used.

For example 1/4" NPT has 18 threads per inch while BSP has 19 TPI and the diameters are roughly the same as well. This makes them semi-compatible.
At 1/2", both use the same pitch, thus being even more compatible.
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Unread postAuthor: MrCrowley » Thu Jan 14, 2010 6:59 pm

When you use such small diameters like 1/4", you can risk breaking the fitting if you try to thread it too much. So if you buy 1/4" brass fittings, I would recommend buying the rest of your 1/4" fittings that attach to this fitting in the same thread (BSP or NPT).
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Unread postAuthor: turner » Fri Jan 15, 2010 8:54 am

yeah i even had a 1/4 npt and cracked it with an npt nipple
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Re: qev valve/threads

Unread postAuthor: Larda » Fri Jan 15, 2010 9:15 am

lojtoy: Are you from Sweden?
If so i guessing that you already know about http://iag.se ?
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Re: qev valve/threads

Unread postAuthor: lojtoy » Fri Jan 15, 2010 9:39 am

Larda wrote:lojtoy: Are you from Sweden?
If so i guessing that you already know about http://iag.se ?

no i didnt and thanks for showing me that there is 1 :D
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Unread postAuthor: Larda » Fri Jan 15, 2010 12:19 pm

Det var så lite så. :)
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