Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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AircannonSweden
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Tue Aug 07, 2012 5:21 am
I made this QEV yesterday and I can't get this sealing leak-free...what can i use for material? The piston is kinda big but it is still under construction
Piston and housing
"sealing"
![Image](http://i50.tinypic.com/k3ap1e.jpg)
As always,have a nice day - FPSrussia
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AircannonSweden
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Tue Aug 07, 2012 5:58 am
MrCrowley: The piston fits perfect in the housing,when i push the piston forward it is air-tight but when i fill a tank with air(3 PSI or something)it will leak...Well,i should see if a find another material
jackssmirkingrevenge: Haha yes
![Very Happy :D](./images/smilies/icon_e_biggrin.png)
i have made one more piston that is much shorter,i have taken out that material in the capacitor and filled it with hot-glue insted...I going to Stockholm today and i maybe found something there
![Wink ;)](./images/smilies/icon_e_wink.png)
As always,have a nice day - FPSrussia
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jonesy42
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Tue Aug 07, 2012 6:16 am
You can buy QEV's on ebay for less than $15! (search quick exhaust valves).
I don't know why people bother "making" qev valves when
they are fairly cheap to buy?....,But thats in my opinion of course,
good luck anyway
![Wink :wink:](./images/smilies/icon_e_wink.png)
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Crna Legija
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Tue Aug 07, 2012 8:06 am
jonesy42 wrote:You can buy QEV's on ebay for less than $15! (search quick exhaust valves).
I don't know why people bother "making" qev valves when
they are fairly cheap to buy?....,But thats in my opinion of course,
good luck anyway
![Wink :wink:](./images/smilies/icon_e_wink.png)
homemade one IMO preform better at least well made ones.
'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson
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AircannonSweden
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Tue Aug 07, 2012 8:40 am
MrCrowley: Thank you,it worked with higher preassure
jonesy42: I have already built a cannon with a QEV from ebay
![Very Happy :D](./images/smilies/icon_e_biggrin.png)
As always,have a nice day - FPSrussia
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Mr.Tallahassee
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Tue Aug 07, 2012 3:03 pm
jonesy42 wrote:You can buy QEV's on ebay for less than $15! (search quick exhaust valves).
I don't know why people bother "making" qev valves when
they are fairly cheap to buy?....,But thats in my opinion of course,
good luck anyway
![Wink :wink:](./images/smilies/icon_e_wink.png)
Good luck finding a QEV with porting larger than an inch for less than an arm and a leg.
![Wink :wink:](./images/smilies/icon_e_wink.png)
Sarcasm is the body's natural defense against stupid.
Petitlu wrote:My balls are made of lead and weigh 22g but I can make heavier or lighter ...
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mattyzip77
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Tue Aug 07, 2012 7:20 pm
Do you go on e bay? I just got two 1 1/2 inch pulse valves for 30 dollars shipped. I have never seen a qev bigger than 3/4 of an inch. After that size they are called diaphragm valves.
Go Bruins!!!!
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Mr.Tallahassee
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Tue Aug 07, 2012 8:25 pm
mattyzip77 wrote:Do you go on e bay? I just got two 1 1/2 inch pulse valves for 30 dollars shipped. I have never seen a qev bigger than 3/4 of an inch. After that size they are called diaphragm valves.
A diaphragm valve is not the same as a piston valve. Apples and oranges cannot be compared. They are similar in principal but they aren't the same. What I'm saying is that I can go buy steel pipe and fittings and make a 2'' ported piston valve for less than the cost of a commercial 2'' valve that also performs better. Why buy something and make do with it when you can build a better one the way
you want? The latter just makes more sense to me.
Sarcasm is the body's natural defense against stupid.
Petitlu wrote:My balls are made of lead and weigh 22g but I can make heavier or lighter ...
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PVC Arsenal 17
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Tue Aug 07, 2012 8:38 pm
jackssmirkingrevenge wrote:By "piston" do you mean half-digested piece of rubber superglued to a capacitor
![Very Happy :D](./images/smilies/icon_e_biggrin.png)
That is priceless. Clever job OP
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mattyzip77
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Tue Aug 07, 2012 9:56 pm
dewey-1 wrote:mattyzip77 wrote:Do you go on e bay? I just got two 1 1/2 inch pulse valves for 30 dollars shipped. I have never seen a qev bigger than 3/4 of an inch. After that size they are called diaphragm valves.
Mead make a 1 inch.
Very expensive though.
http://www.mead-usa.com/products/detail ... =46&type=3
Dewey your always making a liar out of me...
![Very Happy :D](./images/smilies/icon_e_biggrin.png)
Go Bruins!!!!