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 67 users online :: 3 registered, 0 hidden and 64 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

largest you can go with a hammer 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 
  • Author
    Message

largest you can go with a hammer valve?

Unread postAuthor: JDP12 » Fri Oct 21, 2011 12:29 am

More just a thirst for knowledge question here..

whats the largest hammer valve you can make that is still effective? With BTB's new counterbalanced hammer valve and not needing a super strong spring, i'm curious how a hammer valve would perform with a barrel of 1" or 1.25"? Obviously it wouldn't be as efficient as a burst disc say, but I'm just curious.
  • 0

"Some say his pet elephant is pink, and that he has no understanding of "PG rated forum". All we know is, he's called JSR. "
User avatar
JDP12
Major General
Major General
 
Posts: 1943
Joined: Fri Mar 30, 2007 8:34 pm
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Fri Oct 21, 2011 12:49 am

As long as the hammer grows with the valve, you can go as big as you like.

One thing to keep in mind, larger calibre launchers normall use lower pressures - imagine a commercial PCP airgun with a 3000 psi reservoir and a 0.2" valve diameter, that's a force of 94 lbs the hammer has to overcome.

Using the same hammer, you can happily open a 1" valve for a chamber pressure of 120 psi, the force keeping the valve shut are exactly the same.

The above assumes a conventional valve, using Brian's system the potential is much higher.
  • 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: Gun Freak » Fri Oct 21, 2011 9:40 am

If you wanted large bore hammer valves, it would have to be a ballanced valve. I've been pondering this idea lately also.
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: Brian the brain » Fri Oct 21, 2011 10:04 am

I believe it was MRR who made an enlarged version of my " 35 bar" pushbutton valve.
His was 1/2" porting and could be opened by hand at 40 bar IIRC.

The principle behind the pushbutton valve is exactly the same as the counterbalanced hammervalve, just configured differently.

It's also very similar to a QDV.
The QDV uses two O-rings, the CBHV used one O-ring and a flat washer wich means less wear and no trouble passing an airpassage in the pistons housing.

QDV's have been made in ( at least) 2".
No reason for the CBHV not to function at the same size.
The only thing I can imagine is that the travel could be a problem.
A 2" CBHV would need to be knocked in quite some distance to get full flow.
A rotating hammer, like I like to use, would have to be ridiculously large.
It would probably be better to use a linear hammer.


Yep...the CBHV:
Pistonvalve -like performance, but without the waste of pilot volume and multishot without much effort in a compact design.

If you have a lathe it's not that hard to build it into a seamless pipe and have a section of pipe sticking out to house the linear hammer mechanism..
A plug connected to a (regged) HPA or CO2 paintball bottle on the opposite end...Hmmm

I'd go for the 1" caliber version...The valve could be housed in a 1.5" pipe..
That would make quite an interesting PCP...

What would they say at your local airgun shooting club.. :D
  • 0

Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
User avatar
Brian the brain
Moderator
Moderator
 
Posts: 3494
Joined: Mon Dec 05, 2005 2:06 am
Location: Holland
Country: Netherlands (nl)
Reputation: 29

Unread postAuthor: Crna Legija » Sat Oct 22, 2011 8:30 pm

Brian the brain wrote:I believe it was MRR who made an enlarged version of my " 35 bar" pushbutton valve.
His was 1/2" porting and could be opened by hand at 40 bar IIRC.


it was far_cry
http://www.spudfiles.com/forums/posting ... 34167.html
  • 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

Unread postAuthor: Gun Freak » Sat Oct 22, 2011 8:44 pm

Nice link :lol:
  • 0

OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna"M16 BBMGPengunHammer Valve Airsoft SniperHigh Pressure .22 Coax
Holy Shat!
User avatar
Gun Freak
Lieutenant General
Lieutenant General
 
Posts: 4969
Joined: Mon Jan 25, 2010 4:38 pm
Location: Florida
Country: United States (us)
Reputation: 11

Unread postAuthor: jackssmirkingrevenge » Sat Oct 22, 2011 11:56 pm

Brian the brain wrote:If you have a lathe it's not that hard to build it into a seamless pipe and have a section of pipe sticking out to house the linear hammer mechanism..
A plug connected to a (regged) HPA or CO2 paintball bottle on the opposite end...Hmmm

I'd go for the 1" caliber version...The valve could be housed in a 1.5" pipe..
That would make quite an interesting PCP...

What would they say at your local airgun shooting club.. :D


Subtle hint noted :) hammer valve-in-a-pipe is basically what this mechanism is in aid of, albeit with a "conventional" hammer valve.
  • 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

Sponsored

Sponsor
 


Unread postAuthor: Crna Legija » Sun Oct 23, 2011 12:34 am

  • 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

Unread postAuthor: wyz2285 » Sun Oct 23, 2011 4:50 am

I have saw that video long long ago, the "Mrairshot"(video owner) wasn´t very nice to me :roll: didn´t knew he was far_cry :x
but the valve looks interesting, any diagram?
  • 0

CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
User avatar
wyz2285
Major General
Major General
 
Posts: 2244
Joined: Sat Mar 06, 2010 7:50 am
Location: Porto, Portugal
Country: Portugal (pt)
Reputation: 12

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'