QEV air rifle + CO2

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
Post Reply

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
User avatar
jrrdw
Moderator
Moderator
United States of America
Posts: 6572
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Has thanked: 39 times
Been thanked: 22 times
Contact:
Contact jrrdw

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.
Top
warhead052
Staff Sergeant 3
Staff Sergeant 3
Posts: 1769
Joined: Mon Mar 21, 2011 5:41 pm

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!
Top
User avatar
jhalek90
Specialist 4
Specialist 4
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm

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
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.
Top
User avatar
mattyzip77
Sergeant 3
Sergeant 3
United States of America
Posts: 1249
Joined: Tue Jun 28, 2011 12:22 pm
Location: Taxachusetts

can you take this valve apart??? if you can, do so, and clean it really good and lube it up too.
Go Bruins!!!!
Top
User avatar
Gippeto
First Sergeant 3
First Sergeant 3
Venezuela
Posts: 2504
Joined: Sat Jan 19, 2008 10:14 am
Location: Soon to be socialist shit hole.
Has thanked: 2 times
Been thanked: 17 times

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.
"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.
Top
the unit
Private 3
Private 3
Posts: 51
Joined: Tue Jun 24, 2008 8:20 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
Top
User avatar
Cosmic Muffin
Specialist 2
Specialist 2
Posts: 275
Joined: Mon Jan 14, 2008 10:30 pm
Location: arse end of nowhere

edit * post content rendered invalid
Top
Post Reply

Create an account or sign in to join the discussion

You need to be a member in order to post a reply

Create an account

Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute

Register

Sign in

  • Similar Topics
    Replies
    Views
    Last post

Return to “Pneumatic Cannons”