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look what I've got(directional flow control valves)vid added

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: POLAND_SPUD » Fri Nov 20, 2009 5:57 am

it's more complicated but there are off-the-shelf valves that combine some of those parts into one unit
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 20, 2009 6:22 am

My opinion might be ever so slightly biased but it still seems like the pop-off valve is a better idea...
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Unread postAuthor: POLAND_SPUD » Fri Nov 20, 2009 7:04 am

to pilot a QEV gun or to be used as the main valve ?

I don't like the fact that a pop-off valve wastes air when used as a pilot valve... the design I mentioned can automatically switch a DCV form one position to the other.

you see, I've never been a fan of blow forward bolts - they just don't work well for me. I prefer to use air cylinders to load ammo and they work best when used with a DCV




I understand it might seem more complicated than a pop-off valve for you. But I've already need a DCV and this part is a DCV too (but air piloted not manually actuated) so for me it isn't more complicated at all

I just wanted to show that there are other possibilities as well
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Last edited by POLAND_SPUD on Wed Mar 10, 2010 4:34 am, edited 1 time in total.
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Unread postAuthor: POLAND_SPUD » Wed Mar 10, 2010 4:30 am

UPDATE

I just got 3 regs for under 5$... they reg down by 0-8bar.. so if you have air at 10 bar you can reg it down to 2 bar... it also has a check valve so when you vent the input side, air from the output side will flow to the input side

they can be cascaded too... so I can reg air by 8 * 3 = 24bar

there are other fittings like that (not just regs): simple one way flow control valves, one way flow control valves with an in built small QEV (so when you vent the input the output is quickly vented via the QEV), and so on
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Unread postAuthor: jackssmirkingrevenge » Wed Mar 10, 2010 5:44 am

Should we trust such devices in the hands of someone reading about "Propaganda and mass persuasion" :shock: :D
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Unread postAuthor: chinnerz » Wed Mar 10, 2010 5:56 am

to answer that..... no, no we should not
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Unread postAuthor: psycix » Wed Mar 10, 2010 7:12 am

Wait... they reg down by 10-8 bar...
That means that they're just like high resistance check valves or poppoff valves (or crack-open shrader valves)?
So if your input pressure decreases the output pressure decreases as well?
Worth 5 bucks, but rather useless compared to real regulators providing a constant pressure.

The only case I could imagine to use these is to run a pneumatic ram on a lower pressure than the chamber pressure while still directly connecting it, making it more air efficient.
Oh wait. In your case... they seem to be just the thing you need! ;)
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Unread postAuthor: POLAND_SPUD » Wed Mar 10, 2010 7:47 am

@psycix
yeah, exactly..
plus their are really really small when compared with traditional regs
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Unread postAuthor: Goats spudz » Sun Oct 23, 2011 10:33 pm

what site did you buy these? £2 wtf :shock:
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Unread postAuthor: POLAND_SPUD » Sun Oct 23, 2011 11:10 pm

www.allegro.pl - it's more popular in poland than ebay

anyway I am sure you can find stuff like that on ebay too, but you'd have to check it every day or so to find a good bargain
...which is precisely the method I used
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Unread postAuthor: Hotwired » Tue Oct 25, 2011 3:09 am

Thing is with circuits made from valves like this, they tend to be somewhat rambling and bulky.

It's all very well for industrial use where all you want is easily replaceable and accessible parts but not so great when you want something tidy.

Boils down to time/money in the end if you want to make a complex multi-valved system with minimal bulk and connections.
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Unread postAuthor: POLAND_SPUD » Tue Oct 25, 2011 3:24 am

Thing is with circuits made from valves like this, they tend to be somewhat rambling and bulky

That's why they created time delay valve where everything is housed indie one body

like here
http://www.smcworld.com/2002/bp_e/pdf/1305_061.pdf
http://www.esska-tech.co.uk/esska_eng_s ... type_.html


Though it is probably more convinient to use solenoid valves controller by timer relays/555 timer/arduino etc.

does the same thing and gives you more control
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