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
- Specialist

- Posts: 131
- Joined: Thu Oct 27, 2011 11:53 am
- Location: Sweden,Linköping
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"

As always,have a nice day - FPSrussia
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AircannonSweden
- Specialist

- Posts: 131
- Joined: Thu Oct 27, 2011 11:53 am
- Location: Sweden,Linköping
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

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

As always,have a nice day - FPSrussia
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jonesy42
- Private 4

- Posts: 94
- Joined: Sat Jun 02, 2012 9:54 am
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

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Crna Legija
- First Sergeant 2

- Posts: 2333
- Joined: Sun Jul 20, 2008 5:14 am
- Location: australia
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

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
Add me on ps3: wannafuk, 8/11/11 cant wait
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AircannonSweden
- Specialist

- Posts: 131
- Joined: Thu Oct 27, 2011 11:53 am
- Location: Sweden,Linköping
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

As always,have a nice day - FPSrussia
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Mr.Tallahassee
- Specialist 3

- Posts: 364
- Joined: Sun Jul 10, 2011 2:35 am
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

Good luck finding a QEV with porting larger than an inch for less than an arm and a leg.

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
- Sergeant 3


- Posts: 1249
- Joined: Tue Jun 28, 2011 12:22 pm
- Location: Taxachusetts
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
- Specialist 3

- Posts: 364
- Joined: Sun Jul 10, 2011 2:35 am
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
- Staff Sergeant 3

- Posts: 1762
- Joined: Mon Mar 27, 2006 4:18 pm
- Location: United States
Tue Aug 07, 2012 8:38 pm
jackssmirkingrevenge wrote:By "piston" do you mean half-digested piece of rubber superglued to a capacitor

That is priceless. Clever job OP
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mattyzip77
- Sergeant 3


- Posts: 1249
- Joined: Tue Jun 28, 2011 12:22 pm
- Location: Taxachusetts
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...

Go Bruins!!!!