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 40 users online :: 4 registered, 0 hidden and 36 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

1/2" QEV or 3/4" sprinkler valve

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 

Which is the better valve a 1/2" QEV or a 3/4" sprinkler valve?

1/2" QEV
8
100%
3/4" sprinkler valve
0
No votes
 
Total votes : 8
  • Author
    Message

1/2" QEV or 3/4" sprinkler valve

Unread postAuthor: LCTChamp » Tue Dec 09, 2008 9:40 pm

I am planning on building a small bore pneumatic gun. I plan on using a .40 caliber blowgun as a barrel so I can use darts. I wont be using pressure over 100psi because my only source of pressure is a bike pump at this moment. At about the same price which would be a better valve to use the 1/2" QEV or 3/4" sprinkler valve? How would a attach the blowgun barrel to the gun? Epoxy?
  • 0

User avatar
LCTChamp
Sergeant Major
Sergeant Major
 
Posts: 187
Joined: Thu Aug 21, 2008 8:01 am
Reputation: 0

Unread postAuthor: FishBoy » Tue Dec 09, 2008 9:50 pm

QEV i would guess, at least for that barrel.
  • 0

"You polish a turd, it's still a turd"

Remember DYI!!!
User avatar
FishBoy
Colonel
Colonel
 
Posts: 575
Joined: Tue May 27, 2008 5:51 am
Reputation: 0

Unread postAuthor: LCTChamp » Tue Dec 09, 2008 9:52 pm

Is there a specific reason for that choice?
  • 0

User avatar
LCTChamp
Sergeant Major
Sergeant Major
 
Posts: 187
Joined: Thu Aug 21, 2008 8:01 am
Reputation: 0

Unread postAuthor: Velocity » Tue Dec 09, 2008 9:57 pm

QEV's have several advantages over sprinkler valves:
1) More durable construction
2) Greatly improved opening times
3) Better flow

A think a 1/2" QEV will have greater flow than a 3/4 sprinkler valve...it will be close anyways.
  • 0

User avatar
Velocity
Brigadier General
Brigadier General
 
Posts: 1039
Joined: Tue Feb 07, 2006 5:42 pm
Reputation: 0

Unread postAuthor: LCTChamp » Tue Dec 09, 2008 10:01 pm

What kind of epoxy would I use to attach the barrel?
  • 0

User avatar
LCTChamp
Sergeant Major
Sergeant Major
 
Posts: 187
Joined: Thu Aug 21, 2008 8:01 am
Reputation: 0

Unread postAuthor: jook13 » Tue Dec 09, 2008 11:11 pm

Read the epoxy packages. It will usually state what it is designed to bond to.
  • 0

I like to play blackjack. I'm not addicted to gambling, I'm addicted to sitting in a semi-circle.
User avatar
jook13
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 434
Joined: Mon Jan 21, 2008 10:39 pm
Location: Prescott Arizona
Reputation: 0

Unread postAuthor: jon_89 » Wed Dec 10, 2008 12:47 am

I would just go for the sprinkler if you are using blowgun darts. I use a blowgun barrel with a sprinkler and I can shoot a dart 30 feet and go through a .5 inch plank.
Edit: That was using only 30 psi, 1 inch by 5 inch chamber, and a 24 inch barrel.
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: psycix » Wed Dec 10, 2008 7:28 am

Besides the way faster opening times and the metal construction allowing higher pressures, the QEV will probably have about the same flow of the sprinkler.
QEV is way better.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: jon_89 » Thu Dec 11, 2008 12:10 am

I agree with everybody on the QEV if you intend to use different barrels such as a marble barrel but as stated above for blowgun darts a sprinkler would work fine. Today I put a dart through a 2x4 at 140 psi.
  • 0


jon_89
Colonel
Colonel
 
Posts: 607
Joined: Wed Apr 11, 2007 9:50 pm
Reputation: 0

Unread postAuthor: POLAND_SPUD » Thu Dec 11, 2008 1:18 am

my answer is.... 3/4 QEV :D

forget about sprinkler valves QEVs are the way to go.... oh yeah and notice the fact that 3/4" QEVs are only a little bit more expensive than 1/2" ones..
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: LCTChamp » Sat Dec 13, 2008 4:09 pm

Sorry I didn't reply sooner, but I've been busy.

Psycix the metal construction doesn't really matter like I said in the original post I can only go to 100psi.
  • 0

User avatar
LCTChamp
Sergeant Major
Sergeant Major
 
Posts: 187
Joined: Thu Aug 21, 2008 8:01 am
Reputation: 0

Unread postAuthor: Ragnarok » Sat Dec 13, 2008 4:14 pm

I was about to respond with a link to some tests that were done on Spudtech's forums between these two valve sizes, but the archive seems to have done a runner... link's dead.
The QEV won out by a pretty large margin though.

If I were you, I would seriously consider Poland_Spud's recommendation. A 3/4" QEV will be an even better choice.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: Gippeto » Sat Dec 13, 2008 4:16 pm

If you're going to buy a valve, assuming that the costs locally are near each other or not of concern (When does that ever happen?) I would say, get the qev.

It will have a wider range of applications (for future re-use) than the sprinkler valve, and you won't have to mod it either.
  • 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: 2394
Joined: Sat Jan 19, 2008 10:14 am
Location: The Great White North...Canada eh!
Reputation: 11

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'