Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 61 users online :: 6 registered, 0 hidden and 55 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

QEV air rifle + CO2

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
Sponsored 

What do you think about it?

Its ok need changes
2
67%
Good
0
No votes
Worst i have ever seen!
1
33%
 
Total votes : 3
  • Author
    Message

Unread postAuthor: jrrdw » Thu Aug 18, 2011 6:53 am

He's getting pressure build up in the chamber and a release when he pilots the valve so the porting hook up is correct. The problem is in the valve itself.

Here's a trick that may solve the leak in the valve. Hook up the air supply (doesn't matter which one they both are working), submerge the cannon in water then pump up the chamber. If it seals you either needed lubrication or the sealing face was dirty.

If this doesn't work I think you have a bad QEV.

Edit: streetfire kinda beat me to it lol.
  • 0

When life gives you lemons...throw them back they suck!
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6538
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 25

Unread postAuthor: warhead052 » Thu Aug 18, 2011 10:06 am

jrrdw wrote:Here's a trick that may solve the leak in the valve. Hook up the air supply (doesn't matter which one they both are working), submerge the cannon in water then pump up the chamber. If it seals you either needed lubrication or the sealing face was dirty.

If this doesn't work I think you have a bad QEV.

Edit: streetfire kinda beat me to it lol.


About the submersing thing? If you're a moderator you should know who posted about it first!
  • 0


warhead052
Major General
Major General
 
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm
Reputation: 0

Unread postAuthor: jhalek90 » Fri Aug 19, 2011 8:07 am

Also, my QEV allows pressure to build up when the pilot and barrel are swapped, but it wont fire that way.

So if it fires, even just a little bit, i would think it is hooked up correct.

The best way, would be to plug the barrel port, with a metal threaded plug, and then place in a bathtub, like everyone has said ,to see where it leaks.

EDIT: by the second video, i can almost promise you have a pilot leak.
Probably in the blow gun.

How tightly did you thread all the fittings on? They need to be pretty darn tight, and have a good 2-3 wraps of Teflon tape. IMHO
  • 0

jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: mattyzip77 » Fri Aug 19, 2011 10:36 am

can you take this valve apart??? if you can, do so, and clean it really good and lube it up too.
  • 0

Go Bruins!!!!
User avatar
mattyzip77
Donating Member
Donating Member
 
Posts: 1249
Joined: Tue Jun 28, 2011 12:22 pm
Location: Taxachusetts
Reputation: 0

Unread postAuthor: Gippeto » Fri Aug 19, 2011 11:30 am

The seat is the "round" part sticking out the end...where he has attached the barrel....it's threaded in.

X2

Thin smear of grease on the seat may not be a bad idea to at least try.
  • 0

"It could be that the purpose of your life is to serve as a warning to others" – unknown

Liberalism is a mental disorder, reality is it's cure.
User avatar
Gippeto
Donating Member
Donating Member
 
Posts: 2393
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Unread postAuthor: the unit » Fri Aug 19, 2011 1:42 pm

I have a feeling a leak, large pilot volume and the some what restrictive pilot are the culprits. Here is a link to how to apply PTFE tape http://www.youtube.com/watch?v=G3LMrn750Ys
  • 0


the unit
Specialist
Specialist
 
Posts: 51
Joined: Tue Jun 24, 2008 8:20 pm
Reputation: 0

Unread postAuthor: Cosmic Muffin » Mon Sep 05, 2011 8:47 am

edit * post content rendered invalid
  • 0

User avatar
Cosmic Muffin
1st Lieutenant
1st Lieutenant
 
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere
Reputation: 0

Sponsored

Sponsor
 


Previous

Return to Pneumatic Cannon Database

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], Majestic-12 [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'