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Pilot valve : Hose Gun

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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Pilot valve : Hose Gun

Unread postAuthor: frozebyte » Mon Jul 13, 2009 3:50 am

Hello all,
I'm sure people have used these on their guns before, but i just need more information and clarification.
Image

These full metal garden nozzles are easy to find are aren't expensive. I couldn't find any blowgun valves and pressure washers are off the budget, so this was one of the alternatives i could think of. I heard some pneumatics are already using this system backwards.

I thought that it would work the right way but figured that there would be nothing to pressure it close. Would any modifications allow it the right way up?

Probably those that have the trigger on the FRONT would use a system something like MRR's push button pilot? That would work the right way up. Not sure about this.

Cheers,
Froze.


EDIT:
found Snipalux X3, uses a hose gun, what im looking to use :] Just that his isn't a full simple metal one but a sort of heavy-duty looking one.
http://www.spudfiles.com/forums/viewtop ... tml#231531
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Unread postAuthor: Hotwired » Mon Jul 13, 2009 5:46 am

I tried one of the plastic ones back in ye-olde 7 years ago.

The valve on those is a poppet valve with the sealing face being held shut by a spring and the rod on the poppet valve pokes out the back to allow you to haul the poppet in, opening the front and letting the water out.

It worked up to aroundabout 100psi - that being the number my pump dial went up to ^^

It cannot be used backwards. I did actually try that but what happens is that after a few tens of psi the spring just gets pushed back by the pressure, opening the valve slightly and allowing air out.

Something that bugged me was how much the lever liked to move the cannon on firing...
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 13, 2009 5:55 am

Tookthis plastic one to 90-100 psi without leaks or failure.
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Unread postAuthor: frozebyte » Mon Jul 13, 2009 6:55 am

@hotwired
Sorry what do you mean by cannot be used backwards? So where is your chamber connected to? Does it connect at the butt like the snipalux X3?

@JSR, oh so thats a simple chamber>pilot>barrel design?

Thanks all :D
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Unread postAuthor: Hotwired » Mon Jul 13, 2009 6:59 am

Yes it was connected at the base.

You can't have the chamber on the other end for the reasons I said. Unless of course you are looking for about 30psi maximum in your chamber.
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 13, 2009 7:00 am

frozebyte wrote:so thats a simple chamber>pilot>barrel design?


The chamber (in this case a coke bottle) connects to where the hose normally connects, while on the other side a BB chamber and barrel are bodged on with copious amounts of epoxy :)
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Unread postAuthor: frozebyte » Mon Jul 13, 2009 8:32 am

@hotwired
Ok, will try using a sleek plastic/metal hose gun to use as a pilot. is the venting for it good?

@JSR
Yep, what i guessed. Just couldnt think of what that small cylinder was for. BB chamber i see, how many shots could you get out of the bottle? wont a single trigger fire all the air out?(unless you let go really fast)

Cheers
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Unread postAuthor: jackssmirkingrevenge » Mon Jul 13, 2009 9:15 am

frozebyte wrote:BB chamber i see, how many shots could you get out of the bottle? wont a single trigger fire all the air out?(unless you let go really fast)


Read through the thread and your questions should be answered. Note that this was a primitive ghetto desgign born of circumstance, I had made a proper "standalone" BBMG here.

There says I couldn't bother with compressor pressures though, paintball HPA bottles rule :D
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Unread postAuthor: frozebyte » Mon Jul 13, 2009 9:40 am

Alright will read it through. That standalone has a vortex block, too complicated for me to understand :D

EDIT:
read it through but i still dont understand how you fire the bb's out one at a time, or do you drain them all out at once? (can't watch the video)
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Unread postAuthor: MRR » Mon Jul 13, 2009 3:37 pm

Do you remember this one?

http://www.spudfiles.com/forums/home-made-qev-rifle-with-40-pellet-t15091.html

Spike took them past 10 bar on his youtube videos, as far as I know.
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Unread postAuthor: Hotwired » Mon Jul 13, 2009 3:40 pm

Don't confuse models. That is one type which looks like it operates like an air blowgun.

The one originally posted has different internals.
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Unread postAuthor: MRR » Mon Jul 13, 2009 3:45 pm

I understood this topic was about these garden guns in general. Different types, different mechanics.

Just wanted to say that there are models out there which can handle a bit more than 100 psi.
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 14, 2009 1:08 am

frozebyte wrote:read it through but i still dont understand how you fire the bb's out one at a time, or do you drain them all out at once? (can't watch the video)


As with any BBMG, short pressure on the trigger results in a few BBs at a time being fired. With 2 litres of air at 90 psi I could manage this.
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Unread postAuthor: frozebyte » Tue Jul 14, 2009 3:45 am

@MRR
I thought that was a blowgun valve with 'french threads' as stated in comments :]

@hotwired
So thats really a blowgun?

@JSR
I see, so i have this new air blower, and i could just connect it like the way you do and start firing off bbs.

Anyway, back to the point. I couldn't find a hose gun(I think i was at the wrong section, but i found an AIR BLOWER, that seemed something like a pressure washer, but was an air version. Theres no rating, but if its able to hook up to a compressor and start firing away, i think it should be no problem. This plastic one has the same pressure rating as another metal what(but idk the pressure)

Mighty Air blower. Im planning to connect it upside down, wonder if i could use it right side up if im going for only approximately 100psi. Then i would connect it to the back of the tee and it would be much easier to trigger. It jerks when its upside down (top too heavy)
Image

Off topic, but i hope this glue gun doesn't explode on me like the cheap toy-like one did. (BOOM, sparks fly and... hey your glue gun's in flames!)
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Cheers :D
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 14, 2009 4:56 am

Your "air blower" is basically what everyone else here calls a blowgun, if it's made for compressor use then I'd wager it's good for at least 150 psi if used the "right" way. You might also want to consider hacking off the nozzle if you want to use it as a pilot valve, in order to increase flow and efficiency.
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