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 46 users online :: 5 registered, 0 hidden and 41 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

Butterfly Valves?

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

Butterfly Valves?

Unread postAuthor: medievalman » Sat Jan 27, 2007 9:30 am

Why is it that nobody uses butterfly valves? they open relatively fast(faster than a ball valve anyways) and are very simple to use, but i dont think ive ever seen one on a gun! is there a specific reason for this?
  • 0

Join the AirAssault Army!

Welcome to Minnesota, Land of 10,000 Lakes, and 10,000,000,000 Mosquitoes.
User avatar
medievalman
Captain
Captain
 
Posts: 319
Joined: Tue Dec 05, 2006 5:52 pm
Location: Central Minnesota
Reputation: 0

Unread postAuthor: Hotwired » Sat Jan 27, 2007 10:33 am

They're less common and more expensive.

I think a major reason for them being less common is that even fully opened theres the valve disk sitting in the middle of the flow which interrupts it to a degree. Making it thinner reduces its pressure rating, making it thicker obstructs the flow more.

Ball valves can be made more pressure resistant without that problem and can have very little flow obstruction when fully open.
  • 0

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

Unread postAuthor: LucyInTheSky » Sat Jan 27, 2007 11:11 am

But ball valve open 1/2 as quick because your opening 2 sides of the ball.

Also the ammo would have left the barrel before you get any hand operated valve open.
  • 0

If your getting chased off a police dog, try not to run through a tunnel then onto a small see-saw then through a ring of fire. They are trained for that!
User avatar
LucyInTheSky
1st Lieutenant
1st Lieutenant
 
Posts: 293
Joined: Fri Apr 21, 2006 11:46 am
Reputation: 0

Unread postAuthor: BC Pneumatics » Sat Jan 27, 2007 12:07 pm

Generally speaking, by the time you pay for a butterfly valve you could have gotten a better preforming one anyway.
  • 0

<a href="http://www.bcarms.com/"><img src="http://www.bcarms.com/images/store_logo.png" border="0"> </a>
User avatar
BC Pneumatics
Donating Member
Donating Member
 
Posts: 1089
Joined: Tue Jan 18, 2005 6:55 pm
Location: Fresno, CA
Reputation: 0

Unread postAuthor: MrCrowley » Sat Jan 27, 2007 1:14 pm

Even if you did get an electric one,waste of money for the performance.
  • 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: boilingleadbath » Sat Jan 27, 2007 4:48 pm

Electric ones are electric so that you can automate them - I don't think they are acctualy that fast.

Looking on E-bay, anyways, butterfly valves are pretty cheap, compared to 4" ball valves.
  • 0

User avatar
boilingleadbath
Moderator
Moderator
 
Posts: 1642
Joined: Sat Mar 12, 2005 10:35 pm
Location: Pennsylvania, USA
Reputation: 0

Unread postAuthor: frankrede » Sat Jan 27, 2007 5:05 pm

They have pneumatic operated butterfly valves and I would think they open realtively quick.
  • 0

Current project: Afghanistan deployment
User avatar
frankrede
Lieutenant General
Lieutenant General
 
Posts: 3220
Joined: Thu Jul 20, 2006 9:47 pm
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: BC Pneumatics » Sun Jan 28, 2007 11:10 am

But what is the point of a four inch ball valve? the larger ones are so stiff to open, that I think a 2" would give the same performance.... maybe even better.
  • 0

<a href="http://www.bcarms.com/"><img src="http://www.bcarms.com/images/store_logo.png" border="0"> </a>
User avatar
BC Pneumatics
Donating Member
Donating Member
 
Posts: 1089
Joined: Tue Jan 18, 2005 6:55 pm
Location: Fresno, CA
Reputation: 0

Unread postAuthor: boilingleadbath » Sun Jan 28, 2007 2:17 pm

Indeed, BC... but a butterfly valve does not use the same sliding-seal mechanism as a ballvalve, and I wouldn't expcet it to have nearly as much friction.
  • 0

User avatar
boilingleadbath
Moderator
Moderator
 
Posts: 1642
Joined: Sat Mar 12, 2005 10:35 pm
Location: Pennsylvania, USA
Reputation: 0

Unread postAuthor: BC Pneumatics » Sun Jan 28, 2007 3:18 pm

Oh, I don't doubt that a butterfly valve is petter than a ball valve- just that they generally aren't worth the price. (Neither are the large ball valves)
  • 0

<a href="http://www.bcarms.com/"><img src="http://www.bcarms.com/images/store_logo.png" border="0"> </a>
User avatar
BC Pneumatics
Donating Member
Donating Member
 
Posts: 1089
Joined: Tue Jan 18, 2005 6:55 pm
Location: Fresno, CA
Reputation: 0

Unread postAuthor: LGM » Sun Jan 28, 2007 3:27 pm

If I was making a very large cannon I would use a butterfly valve. Smaller than 4" you could just use a piston or ball valve depending on size.
  • 0


LGM
Captain
Captain
 
Posts: 320
Joined: Mon Jan 22, 2007 3:06 pm
Reputation: 0

Unread postAuthor: Hotwired » Sun Jan 28, 2007 7:33 pm

You go ahead and buy a manual valve for a >4" cannon

It'll cost a fortune and be incredibly awkward.
  • 0

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

Unread postAuthor: BC Pneumatics » Sun Jan 28, 2007 7:42 pm

Aren't most pumpkin chuckers now-a-days using some form of manual' valve that is modified to open a bit faster?
  • 0

<a href="http://www.bcarms.com/"><img src="http://www.bcarms.com/images/store_logo.png" border="0"> </a>
User avatar
BC Pneumatics
Donating Member
Donating Member
 
Posts: 1089
Joined: Tue Jan 18, 2005 6:55 pm
Location: Fresno, CA
Reputation: 0

Unread postAuthor: medievalman » Mon Jan 29, 2007 8:04 pm

so the only reason they aren't used is because of the high cost without a great performance? thanks!
  • 0

Join the AirAssault Army!

Welcome to Minnesota, Land of 10,000 Lakes, and 10,000,000,000 Mosquitoes.
User avatar
medievalman
Captain
Captain
 
Posts: 319
Joined: Tue Dec 05, 2006 5:52 pm
Location: Central Minnesota
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'