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 75 users online :: 7 registered, 0 hidden and 68 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

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

The Team
Administrators
Global Moderators
global_moderators.png CS

piston qev in america

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

piston qev in america

Unread postAuthor: twizi » Tue Aug 18, 2009 5:45 pm

hey guys ive been looking for a piston qev in ameica all i see is diaghram valves if you now where to get them please post a link
  • 0

User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: noname » Tue Aug 18, 2009 5:51 pm

Why?
  • 0

User avatar
noname
Lieutenant General
Lieutenant General
 
Posts: 2699
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA
Country: United States (us)
Reputation: 9

Unread postAuthor: twizi » Tue Aug 18, 2009 5:55 pm

the piston ones can take more presure i belive right or the dighram rip burts or tears and it might cause accidentily firing
  • 0

User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: MrCrowley » Tue Aug 18, 2009 10:49 pm

twizi wrote:the piston ones can take more presure i belive right or the dighram rip burts or tears and it might cause accidentily firing

Whether the McMaster-Carr are diaphragm or piston QEV's, they can still take over 500PSI. How high are you going?

I think you should be more worried about other parts failing/accidentally triggering the pilot valve rather than the diaphragm tearing.
  • 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: daberno123 » Wed Aug 19, 2009 11:26 am

I believe QEVs from Fastenal are the piston type. The look very similar to the ones sold in the UK, and those are practically all piston types.
  • 0

User avatar
daberno123
Colonel
Colonel
 
Posts: 594
Joined: Mon Nov 19, 2007 5:56 pm
Location: Ohio
Reputation: 0

Unread postAuthor: jeepkahn » Wed Aug 19, 2009 11:36 am

yes, the qevs by Alpha(sold by fastenal) are piston type, I've had no failures running 700psi in the 3/4" and 1/4" models...
  • 0

My Cannons can be found by clicking the following link.
http://www.spudfiles.com/forums/viewtop ... tml#256896

jeepkahn
Colonel
Colonel
 
Posts: 747
Joined: Fri Jan 09, 2009 1:11 pm
Location: Triad, NC, USA
Reputation: 0

Unread postAuthor: qwerty » Wed Aug 19, 2009 12:54 pm

Are parker QEVs diagram or piston because these are
Image
  • 0

I visit occasionally to make unrelated posts.
User avatar
qwerty
Colonel
Colonel
 
Posts: 677
Joined: Sun Apr 12, 2009 2:16 am
Location: Evesham, Worcs
Country: United Kingdom (uk)
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: twizi » Wed Aug 19, 2009 4:15 pm

ive orderd a 1/4 a while back in 2008 i think, and its a dighram so u guys dont think it will tear the diagram at unregged co2 presure about 900 psi
  • 0

User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Unread postAuthor: Hotwired » Wed Aug 19, 2009 5:45 pm

They sell replacement diaphragms for a reason. They DO fail eventually even when used by responsible operators who use them at recommended pressure.

Your own call to take it to 900psi, They have been used at unregged co2 pressure and a diaphragm on one has burst at said pressure when it got poked by accident.

Opinions won't make it not burst, If you want to be safe at 900psi use a full bore ball valve after the QEV and open that before firing.
  • 0

User avatar
Hotwired
Lieutenant General
Lieutenant General
 
Posts: 2599
Joined: Fri Oct 13, 2006 5:51 am
Location: UK
Reputation: 0

Unread postAuthor: twizi » Wed Aug 19, 2009 5:52 pm

thanks hot wired
  • 0

User avatar
twizi
Colonel
Colonel
 
Posts: 511
Joined: Thu Nov 27, 2008 9:04 pm
Location: up yours
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Exabot [Bot], Google [Bot], Google Adsense [Bot], MCRKilljoy, MSNbot Media, Yahoo [Bot]

Reputation System ©'