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replicating hand slide valve help

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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replicating hand slide valve help

Unread postAuthor: Major Collins » Fri May 20, 2011 12:23 pm

upgrading from a ball valve and would like to replicate a hand slide valve ,like this one

Image
how should i go about it?

also this same slide valve as you see has 16 mm male thread, is that close to 1/2 inch npt threads? ( eg would this screw into a 1/2 female tee)
btw this exact model is about 10$ posted on ebay
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Unread postAuthor: jackssmirkingrevenge » Fri May 20, 2011 3:57 pm

You mean you're going to use this to pilot an exhaust valve, right?
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Unread postAuthor: POLAND_SPUD » Fri May 20, 2011 8:28 pm

it can be done but it is probably cheaper to buy one...

Technically it isn't very complicated - it's just an inverted spool valve (the slide acts as the spool).
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Unread postAuthor: Major Collins » Fri May 20, 2011 10:00 pm

jackssmirkingrevenge wrote:You mean you're going to use this to pilot an exhaust valve, right?


yeah for replacing a ball valve for actuating a piston valve
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Unread postAuthor: Crna Legija » Fri May 20, 2011 10:31 pm

really if it only $10 just buy it, coz they would be hard to make with out a lathe
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Unread postAuthor: PVC Arsenal 17 » Fri May 20, 2011 11:42 pm

Check out this thread. It should be just what you're looking for.

Consult this page for a nice diagram of how they work.
(slide check = slide valve = sleeve valve)

IIRC you can buy 1/2" NPT sleeve valves from McMaster. If you're using it as a pilot, you're probably best off just buying a smaller one and adapting it to 1/2" with some fittings. An 1/8" sleeve valve should be more than enough to pilot a 3/4" QEV. If not, you can drill additional exhaust holes.
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