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 56 users online :: 5 registered, 0 hidden and 51 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Sprinkler valve question

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

Sprinkler valve question

Unread postAuthor: Mike_Hunt0420 » Sun May 10, 2009 12:29 am

How well do you think modding one of these would work?

http://www.sprinklerwarehouse.com/Rain- ... 100-gb.htm

I'm trying to work on a high preasure copper sniper.
  • 0


Mike_Hunt0420
Specialist
Specialist
 
Posts: 48
Joined: Fri May 08, 2009 5:11 am
Location: california
Reputation: 0

Unread postAuthor: Carlman » Sun May 10, 2009 12:36 am

Probably decent enough but for that price you may aswell buy a qev if its a premade valve your after.
  • 0

Image
Aussie spudders unite!!
User avatar
Carlman
Major General
Major General
 
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Reputation: 0

Unread postAuthor: Mike_Hunt0420 » Sun May 10, 2009 12:40 am

tell me more of these qev valves. they premade just for spud guns?
  • 0


Mike_Hunt0420
Specialist
Specialist
 
Posts: 48
Joined: Fri May 08, 2009 5:11 am
Location: california
Reputation: 0

Unread postAuthor: inonickname » Sun May 10, 2009 2:41 am

Mike_Hunt0420 wrote:tell me more of these qev valves. they premade just for spud guns?


I think you need to do some research.

A QEV is a quick exhaust valve which is pneumatically actuated. They usually have a piston valve while a sprinkler valve usually uses a diaphragm.

Basically a piston valve made to high tolerances
  • 0

PimpAssasinG wrote:no im strong but you are a fat gay mother sucker that gets raped by black man for fun
User avatar
inonickname
Lieutenant General
Lieutenant General
 
Posts: 2606
Joined: Sun Dec 07, 2008 3:27 am
Reputation: 0

Unread postAuthor: Carlman » Sun May 10, 2009 10:14 am

Not true ion, diapragm qevs are made to just as higher tollerances as piston or shuttle qevs are.
  • 0

Image
Aussie spudders unite!!
User avatar
Carlman
Major General
Major General
 
Posts: 1618
Joined: Sat Nov 24, 2007 1:18 am
Location: Western Australia
Reputation: 0

Unread postAuthor: Technician1002 » Sun May 10, 2009 11:21 am

Mike_Hunt0420 wrote:tell me more of these qev valves. they premade just for spud guns?


A QEV Piston or QEV diaphragm is a QEV only because of the ratio of the diameters and barrel sealing configuration. If the seal is small in relation to the diameter then the pilot pressure is the main mover of the valve. The valve speed is directly related to the rate the pilot is vented.

In a QEV, piston or diaphragm, the close diameter ratio increases the positive feedback on the valve as it opens, so the large area with a pressure change (barrel facing area) avalanches the valve open so the valve speed is no longer governed by the rate the pilot can be vented. It is designed to pop open when it opens.

I have a little write up on them on this other forum on QEV valves which goes into some of the math that makes them pop open.
http://www.crazybuilders.com/forum/showthread.php?t=18
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'