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 50 users online :: 4 registered, 0 hidden and 46 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

Quick disconnect fittings

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

Quick disconnect fittings

Unread postAuthor: FighterAce » Fri Oct 08, 2010 5:16 pm

I'm looking to replace the schrader valves on my guns because they are too slow to attach to my pump....
I got a few questions related to quick disconnects so bear with me...

Witch quick disconnect can act like a schrader valve?
Can you disconnect them under pressure?
How much pressure can they hold?
Should I be looking for pneumatic or hydraulic fittings?
  • 0

User avatar
FighterAce
1st Lieutenant
1st Lieutenant
 
Posts: 286
Joined: Fri Oct 23, 2009 1:28 pm
Location: Croatia/Zagreb
Country: Croatia (hr)
Reputation: 1

Re: Quick disconnect fittings

Unread postAuthor: Ragnarok » Fri Oct 08, 2010 5:22 pm

FighterAce wrote:Witch quick disconnect can act like a schrader valve?
Not sure what you mean by that.

Can you disconnect them under pressure?
Yes, although most do not have a built in check valve.

How much pressure can they hold?
Totally varies with model. I've seen pneumatic ones anywhere between 7 bar and 70 bar. (Presumably to roughly correlate with 100 and 1000 psi).
Really don't know about hydraulic ones - never looked for them, wouldn't even be certain they exist.

Should I be looking for pneumatic or hydraulic fittings?
Mostly depends on what pressure you need, but I'd go pneumatic unless you have to.
  • 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: Gun Freak » Fri Oct 08, 2010 5:23 pm

It depends what pressure you want to use. I'm not sure about QCs with check valves but I always add a ball valve to control how much air gets through and when. You can also pilot guns through the ball valve if you want. Disconnecting them and connecting them gets hard after 100 psi for me, but it can be done. If you are looking at like fridge compressor pressures then you need a venting system to make it easier.
  • 0

Attachments
demopn.png
demopn.png (18.53 KiB) Viewed 516 times
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

Re: Quick disconnect fittings

Unread postAuthor: FighterAce » Fri Oct 08, 2010 5:44 pm

Thanks!

Ragnarok wrote:
FighterAce wrote:Witch quick disconnect can act like a schrader valve?
Not sure what you mean by that.


As I understand it, there are 2 types of quick disconnects... ones that have built in check valve and ones that dont... not sure if they have any specific names. How can you tell witch is witch?

I'm gonna be using a pump like I said... it goes up to 40 bar.

And I'd really like to avoid ball valves as much as possible.
  • 0

User avatar
FighterAce
1st Lieutenant
1st Lieutenant
 
Posts: 286
Joined: Fri Oct 23, 2009 1:28 pm
Location: Croatia/Zagreb
Country: Croatia (hr)
Reputation: 1

Unread postAuthor: Lockednloaded » Fri Oct 08, 2010 5:56 pm

If you have a female QC on our gun It will work exactly how you specifically need it to work, but in order to connect it to an air compressor you would need a male QC adaptor
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

Unread postAuthor: FighterAce » Fri Oct 08, 2010 6:08 pm

Please, stop mentioning air compressors :D I dont have one and dont plan on getting one anytime soon.

So... the female QC on the gun and male QC on the pump hose I guess.

Any word of advice on reliability? Will I need to open it up (if I even can) and replace any O rings after a while?
  • 0

User avatar
FighterAce
1st Lieutenant
1st Lieutenant
 
Posts: 286
Joined: Fri Oct 23, 2009 1:28 pm
Location: Croatia/Zagreb
Country: Croatia (hr)
Reputation: 1

Unread postAuthor: Lockednloaded » Fri Oct 08, 2010 6:33 pm

nope, they hardly ever break down, I've never had one break on me or even leak.

FighterAce wrote: So... the female QC on the gun and male QC on the pump hose I guess.

correct
  • 0

I love lamp
User avatar
Lockednloaded
Major General
Major General
 
Posts: 1558
Joined: Thu Sep 03, 2009 9:38 pm
Location: Texas, USA
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: FighterAce » Fri Oct 08, 2010 6:59 pm

Guess I'm locked n loaded to go shopping :D

Thank you all for the help.
  • 0

User avatar
FighterAce
1st Lieutenant
1st Lieutenant
 
Posts: 286
Joined: Fri Oct 23, 2009 1:28 pm
Location: Croatia/Zagreb
Country: Croatia (hr)
Reputation: 1

Unread postAuthor: Gun Freak » Fri Oct 08, 2010 7:55 pm

Be careful with the cheap ones you get for like 2.50 from Home Depot. If you wiggle the connection it will leak and they are rather cheaply built. I reccomend the 8 dollar ones with the 3/8" connection. They are universal and don't leak and are much stonger and well built.
  • 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: BeaverRat » Fri Oct 08, 2010 8:15 pm

As long as you keep them under 250 psi, you should be able to disconnect them without draining the hose of pressure. Otherwise, you have to have a ball valve on the gun (even female QDs don't have a check valve, so if you try and drain the line without closing of the guns chamber with some sort of valve, the pressure will exit the guns chamber, because when a female and male QD are connected, the air has a straight path through) and a
Drain valve.
  • 0

User avatar
BeaverRat
Master Sergeant
Master Sergeant
 
Posts: 161
Joined: Wed May 05, 2010 9:15 pm
Reputation: 0

Unread postAuthor: jhalek90 » Fri Oct 08, 2010 8:15 pm

my 1/4 Qc valve from home depot was 5 bucks for both a male and a female part, i have used them up to 850 psi many many times.

You WILL need a ball valve, because you simply can not disconnect them under more than 200psi. ... at least.... not with your hands.
  • 0

jackssmirkingrevenge wrote:I wonder... if you put flammable vapours inside a lady... could you get her to diesel?

POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
User avatar
jhalek90
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 498
Joined: Fri Aug 14, 2009 5:37 pm
Reputation: 0

Unread postAuthor: Gun Freak » Fri Oct 08, 2010 8:20 pm

@BeaverRat, FQCs definitely have a check valve. They close themselves when there is no male QC inserted. (TWSS) :D
  • 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

Re: Quick disconnect fittings

Unread postAuthor: D_Hall » Fri Oct 08, 2010 10:18 pm

FighterAce wrote:Witch quick disconnect can act like a schrader valve?
Umm.... None. Schrader valves act like schrader valves.

Can you disconnect them under pressure?
Most of them, yes, but there are QDs that are designed to NOT be disconnectable under pressure. These tend to be specialized parts, however, and not something you're likely to find unless you're looking for them.

How much pressure can they hold?

It all depends... I've got some hydraulic QDs at the office that are good to 7,000 psi.

Should I be looking for pneumatic or hydraulic fittings?

It entirely depends on what you're trying to do... Which you haven't really stated. My money is on pneumatic, however. The demands of spud guns aren't particularly demanding.
  • 0

Simulation geek (GGDT / HGDT) and designer of Vera.
User avatar
D_Hall
Donating Member
Donating Member
 
Posts: 1759
Joined: Thu Feb 07, 2008 7:37 pm
Location: SoCal
Reputation: 6

Unread postAuthor: Moonbogg » Sat Oct 09, 2010 1:46 am

I use s pneumatic QD with check valve on my hybrid. It shoots around 200psi and has held up fine to hundreds of shots with no leaking.
  • 0

User avatar
Moonbogg
Major General
Major General
 
Posts: 1375
Joined: Mon Oct 13, 2008 10:20 pm
Location: whittier, CA USA
Reputation: 0

Unread postAuthor: BeaverRat » Sat Oct 09, 2010 2:34 am

Gun Freak wrote:@BeaverRat, FQCs definitely have a check valve. They close themselves when there is no male QC inserted. (TWSS) :D


I never said they didn't close themselves when there is no male QC :wink: I simply stated that if you are at pressures above say 300 PSI, where it is nearly impossible to remove a QD female from a QD male, you must first drain the line pressure. Since the check valve is forced open when the male is in the female socket, draining the line before disconnecting will also drain the chamber. Where if there was a true stand alone check valve, the pressure couldn't leave the chamber, even if there was a male QD in the female socket. I stated (very messily) that an alternative to buying a check valve, would be to put a ball valve behind the female (or male) QD on the cannon, and a line drain somewhere else.
  • 0

User avatar
BeaverRat
Master Sergeant
Master Sergeant
 
Posts: 161
Joined: Wed May 05, 2010 9:15 pm
Reputation: 0

Next

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'