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joining qev to a slide 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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joining qev to a slide valve

Unread postAuthor: shiny455 » Thu Aug 23, 2012 3:13 am

i just bought a cheap qev and slide valve off ebay. I think i made the mistake of buying the one of the cheapest ones i could find to handle the pressure. any way the problem i have is the slide valve has the standard 1/4bsp fittings (one male and one female) and the qev has three female fittings around 15mm (i assume 15mm unc but am not really sure) i searched through taps at work today and we just happened to be out of all metric taps near that size but its not a standard imperial, perhaps npt or next size up bsp however the 10mm plumbing fittings at bunnings have the correct outer thread. Would anyone know how to go about finding a fitting to join the two. i would like to try and avoid soldering them together as it would make the slide valve unserviceable and i assume the heat would burn the two o-rings inside the slide valve. and on a side not while im asking is a qev with 0.6" ports large enough to make a marble sized barrel or should i try and downsize to 6-8mm bb's or ball bearings. and ill probably be running around 100 psi [/img]
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Unread postAuthor: jackssmirkingrevenge » Thu Aug 23, 2012 3:23 am

The QEV is probably 3/8" BSP.

I think the easiest solution is to buy a QEV that matches, these should have 1/4" BSP threads:

http://www.ebay.com/itm/XQ170600-G1-4-F ... 337a6e0edc

http://www.ebay.com/itm/1-2-Inlet-Outle ... 3f1a4ebb3b
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