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 66 users online :: 3 registered, 0 hidden and 63 guests


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

Registered users: Bing [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Help with a QEV

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.
Sponsored 
  • Author
    Message

Help with a QEV

Unread postAuthor: AircannonSweden » 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

Image

"sealing"

Image

Image
  • 0

As always,have a nice day - FPSrussia
User avatar
AircannonSweden
Sergeant First Class
Sergeant First Class
 
Posts: 131
Joined: Thu Oct 27, 2011 11:53 am
Location: Sweden,Linköping
Reputation: 0

Unread postAuthor: MrCrowley » Tue Aug 07, 2012 5:40 am

Is the piston even larger in diameter than the seat?
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: jackssmirkingrevenge » Tue Aug 07, 2012 5:44 am

By "piston" do you mean half-digested piece of rubber superglued to a capacitor :D
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: AircannonSweden » 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 :D 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 ;)
  • 0

As always,have a nice day - FPSrussia
User avatar
AircannonSweden
Sergeant First Class
Sergeant First Class
 
Posts: 131
Joined: Thu Oct 27, 2011 11:53 am
Location: Sweden,Linköping
Reputation: 0

Unread postAuthor: MrCrowley » Tue Aug 07, 2012 6:01 am

3PSI isn't enough, try 30.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: jonesy42 » 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:
  • 0


jonesy42
Sergeant
Sergeant
 
Posts: 94
Joined: Sat Jun 02, 2012 9:54 am
Reputation: 0

Unread postAuthor: Crna Legija » 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:


homemade one IMO preform better at least well made ones.
  • 0

'' 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
User avatar
Crna Legija
Major General
Major General
 
Posts: 2333
Joined: Sun Jul 20, 2008 5:14 am
Location: australia
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: AircannonSweden » Tue Aug 07, 2012 8:40 am

MrCrowley: Thank you,it worked with higher preassure :D

jonesy42: I have already built a cannon with a QEV from ebay :D
  • 0

As always,have a nice day - FPSrussia
User avatar
AircannonSweden
Sergeant First Class
Sergeant First Class
 
Posts: 131
Joined: Thu Oct 27, 2011 11:53 am
Location: Sweden,Linköping
Reputation: 0

Unread postAuthor: Mr.Tallahassee » 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:
Good luck finding a QEV with porting larger than an inch for less than an arm and a leg. :wink:
  • 0

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 ...
User avatar
Mr.Tallahassee
Major
Major
 
Posts: 364
Joined: Sun Jul 10, 2011 2:35 am
Reputation: 0

Unread postAuthor: mattyzip77 » 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.
  • 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: Mr.Tallahassee » 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.
  • 0

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 ...
User avatar
Mr.Tallahassee
Major
Major
 
Posts: 364
Joined: Sun Jul 10, 2011 2:35 am
Reputation: 0

Unread postAuthor: dewey-1 » Tue Aug 07, 2012 8:35 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.


Mead make a 1 inch.
Very expensive though.
http://www.mead-usa.com/products/detail ... =46&type=3
  • 0

User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Unread postAuthor: PVC Arsenal 17 » Tue Aug 07, 2012 8:38 pm

jackssmirkingrevenge wrote:By "piston" do you mean half-digested piece of rubber superglued to a capacitor :D


That is priceless. Clever job OP
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: mattyzip77 » 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... :D
  • 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: AircannonSweden » Sun Aug 12, 2012 10:38 am

This is what i came up with,it is piloted by a 1/2" ball valve!

Image

Image

Image
  • 0

As always,have a nice day - FPSrussia
User avatar
AircannonSweden
Sergeant First Class
Sergeant First Class
 
Posts: 131
Joined: Thu Oct 27, 2011 11:53 am
Location: Sweden,Linköping
Reputation: 0

Next

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'