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 68 users online :: 5 registered, 0 hidden and 63 guests


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

Registered users: Bing [Bot], Exabot [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

Sprinkler Valve

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Sprinkler Valve

Unread postAuthor: ShowNoMercy » Thu Dec 06, 2007 5:28 pm

A few days ago some one was asking about a combustion with a breach loading feature. I was thinking about it and since a combustion requires a burst disk, a breach load is kinda of useless if your using loose fitting ammunition. So I was thinking of this, if you could find the max pressure the gun would make and then have a sprinkler valve piloted by a regulator set to that pressure you could essentially have a high ROF combustions. What do you think?
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: BigGrib » Thu Dec 06, 2007 5:33 pm

i don't know about you but my combustion doesn't require a burst disk
  • 0

Yea, that's definitely going to get you at least a tazer.

<a href="http://www.youtube.com/watch?v=AkMkGOpAF4s">DONT TAZE ME BRO.. DONT TAZE ME... AHHHH</a>
facebook.com/biggrib
User avatar
BigGrib
Colonel
Colonel
 
Posts: 652
Joined: Mon Oct 01, 2007 11:43 pm
Location: TriCities, WA
Reputation: 0

Unread postAuthor: ShowNoMercy » Thu Dec 06, 2007 5:34 pm

Ok, let me rephrase that, a combustion that uses propane or some other gas in which you pressurize the chamber. So I don't know about you but unless there is a burst disk or tight fitting projectile that gas goes bye bye.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: bigbob12345 » Thu Dec 06, 2007 6:20 pm

I think you mean a hybrid
  • 0

User avatar
bigbob12345
Major General
Major General
 
Posts: 1516
Joined: Sat Dec 01, 2007 9:13 am
Location: Mercer Island,Washington
Reputation: 0

Unread postAuthor: ShowNoMercy » Thu Dec 06, 2007 6:22 pm

Nope no hybrid.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Unread postAuthor: cwazy1 » Thu Dec 06, 2007 6:22 pm

umm yes if you have hybrid, then you need a burst disk, if you just have an advanced combustion, then you dont.
  • 0


cwazy1
Captain
Captain
 
Posts: 305
Joined: Mon Sep 10, 2007 8:31 pm
Reputation: 0

Unread postAuthor: ShowNoMercy » Thu Dec 06, 2007 6:23 pm

So the propane just chills inside the chamber and doesn't leave it because?
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: goathunter » Thu Dec 06, 2007 6:37 pm

No, your projectile stops the propane from exiting the barrel.No burst disk just the necessity of a tight fitting projectile or firing fast.
  • 0

"Some people wonder all their lives if they've made a difference. The Marines don't have that problem"-Ronald Reagan

"KA BLAAM! Elimination! Lack of education."-Big Mama, Fox and the Hound, Disney

goathunter
Colonel
Colonel
 
Posts: 676
Joined: Thu Feb 15, 2007 9:20 pm
Reputation: 0

Unread postAuthor: TurboSuper » Thu Dec 06, 2007 9:23 pm

If you're using loose fitting ammunition then your spudgun simply won't work (or at least not very well). The pressure will just bypass the projectile.
  • 0

"If at first you dont succeed, then skydiving is not for you" - Darwin Awards

TurboSuper
Brigadier General
Brigadier General
 
Posts: 986
Joined: Thu Jun 16, 2005 1:44 pm
Reputation: 0

Re: Sprinkler Valve

Unread postAuthor: Hubb » Thu Dec 06, 2007 9:33 pm

ShowNoMercy wrote:So I was thinking of this, if you could find the max pressure the gun would make and then have a sprinkler valve piloted by a regulator set to that pressure you could essentially have a high ROF combustions. What do you think?


I wasn't understanding the first half but I did understand the second half. It sounds like a really good idea but there are some obvious issues.

1 - the rubber diaphragm in the valve may not be able to handle the heat generation and pressure spike. This can be fixed by making a metal diaphragm using Noname's sprinkler valve mod (minus the blowgun portion).
2 - Measuring the pressure in the chamber may be an issue due to the pressure spike. From my understanding, the temperature rises and falls pretty quick, thus making the gauge fairly inaccurate. This could be solved by using some type of liquid with a check valve.
3 - Instead of using a regulator, which may or may not work, why not find a pop-off valve to do the same?
  • 0

User avatar
Hubb
Major General
Major General
 
Posts: 2390
Joined: Mon May 28, 2007 8:39 am
Location: South Georgia
Reputation: 2

Unread postAuthor: DYI » Thu Dec 06, 2007 10:14 pm

The injection of propane will increase the chamber pressure to 0.6 psig, so as long as the projectile can prevent that from escaping, then all is well. With a loose fitting, not sealing projectile like a golf ball in SDR 21, some air/propane will escape, but not enough that it will throw off the ratio to the extent that the gun will not fire. Burst disks almost always help a combustion's performance though, because they allow a faster pressure release. Kind of like switching from a ball valve to a burst disk valve on a pneumatic.
  • 0

Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
DYI
Lieutenant General
Lieutenant General
 
Posts: 2861
Joined: Sat Jul 07, 2007 8:18 pm
Location: The People's Republic of Canuckistan
Country: Turks and Caicos Islands (tc)
Reputation: 9

Unread postAuthor: ShowNoMercy » Thu Dec 06, 2007 10:17 pm

Ah I guess I misunderstood just how much pressure was put in first. Well then cancel that idea. Thanks for the help though.
  • 0

Jesus saves, no need to pray
The gates of pearl have turned to gold
It seems you've lost your way
User avatar
ShowNoMercy
Brigadier General
Brigadier General
 
Posts: 1094
Joined: Mon Mar 19, 2007 8:08 am
Location: Jersey Bitches!
Reputation: 0

Return to Combustion Cannon Discussion

Who is online

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

Reputation System ©'