mcarterbrown.com  

Reply
 
Thread Tools Search this Thread
Old 01-29-2012, 10:27 PM   #1 (permalink)
Wookie D*ck
 
russc's Avatar
 
Join Date: Apr 2006
Location: Vancouver, BC

Airgunner solution to valve volume in a cartridge valved Sheridan

Here are a couple modified Sheridan cartridge valves.

The first would be very simple to achieve with a standard PGP2k valve. Note the front left valve, with slots milled into the sides. The front and rear orings would have to be in good shape to hold air, which isn't really the case on the stock gun.

The payoff is a huge valve volume, which would make getting double barrel guns up to high velocity an easy feat.

Name:  IMG_9600.jpg
Views: 954
Size:  56.0 KB

The second valve has separated the valve body and check valve into separate components. In a PGP2k, the check valve would be replaced by the chamber plug and 12 gram seal.

Name:  skel1.jpg
Views: 1439
Size:  56.0 KB
__________________
Quote:
Originally Posted by agentSmith View Post
oldschool play is about sportsmanship and respect, oldschool gear is available on Ebay.
russc is offline   Reply With Quote
Old 01-29-2012, 10:47 PM   #2 (permalink)
Post Whore
 
the_chemist's Avatar
 
Join Date: Jan 2010
Location: San Fran now

Nice work!

I just worry about static o-rings holding pressure, it is the reason BE nightmares fail.

Perhaps taper the area in front of the orings and put a spacer that will help push the orings out, like the non-cartridge valve.

Something I've done is to shorten the threaded portion of the cartrige valve to increase the area behind the valve.
__________________
feedback
the_chemist is offline   Reply With Quote
Old 01-29-2012, 10:51 PM   #3 (permalink)
Wookie D*ck
 
russc's Avatar
 
Join Date: Apr 2006
Location: Vancouver, BC

IIRC, the main issue with the nightmares was cutting the o-rings as you pushed them past the air transfer ports in the back of the gun. I think the best comparison with these would be Spyder/CCM/AKA style valves, which rely on a static oring in a groove without any taper holding them in.
__________________
Quote:
Originally Posted by agentSmith View Post
oldschool play is about sportsmanship and respect, oldschool gear is available on Ebay.
russc is offline   Reply With Quote
Old 01-30-2012, 12:13 AM   #4 (permalink)
THE NEW PA
 
B.R.'s Avatar
 
Join Date: Nov 2010
Location: ne Pa

i dont think im understanding this. what the extra length is doing. it seams like the limiting factor for a cartidge valve would be the area the gas has to flow through in the valve itself.
like area around the valve seal and small area inside the valve and transfer hole.
what is airgunner?
__________________
FEEDBACK http://www.mcarterbrown.com/forums/f...-feedback.html
this big tranformer came through a town like 30 miles from my hometown!!
B.R. is offline   Reply With Quote
Old 01-30-2012, 12:24 AM   #5 (permalink)
Wookie D*ck
 
russc's Avatar
 
Join Date: Apr 2006
Location: Vancouver, BC

I grabbed these images from an airgun forum. They aren't adding length - those are CB9 valves - they're removing the exterior wall of the Sheridan cartridge valve to increase the total gas available when the valve opens. Stock Sheridans have tiny little chambers, and PPS even opens them up when they make their scratchbuilt guns. This is just a dead simple way of increasing volume in a cartridge valved gun.
__________________
Quote:
Originally Posted by agentSmith View Post
oldschool play is about sportsmanship and respect, oldschool gear is available on Ebay.
russc is offline   Reply With Quote
Old 01-30-2012, 12:27 AM   #6 (permalink)
THE NEW PA
 
B.R.'s Avatar
 
Join Date: Nov 2010
Location: ne Pa

ok thanks, im getting ready to do a regulated sheridan project. and was searching for cartridge valve mods. funny you posted this tonight.
and i came accross mads thread about his cocker valve adapter.
ill do some googling for cb9
__________________
FEEDBACK http://www.mcarterbrown.com/forums/f...-feedback.html
this big tranformer came through a town like 30 miles from my hometown!!
B.R. is offline   Reply With Quote
Old 01-31-2012, 03:36 PM   #7 (permalink)
Simple mind - beware
 
Chaz's Avatar
 
Join Date: May 2008
Location: Ajax, Ontario, Canada

hmm.. so by adding the second o-ring to the transfer port you could potentially open the entire air chamber up to increase air volume?

I have a scrapped project gun that I could revive and try this.. its almost a lost cause anyway so I would not be out much.
__________________
Quote:
Originally Posted by Mar View Post
I googled: "Lube and SPace Dildo" and it brought me here... totally not what I meant, but I found a nice niche market to peddle my homo-erotic comedy routine so here I am.
Quote:
Originally Posted by Mayvik View Post
9 times out of 10, it's an electric razor. But sometimes...

it's a dildo.
Me Feedback
Chaz is offline   Reply With Quote
Old 01-31-2012, 03:51 PM   #8 (permalink)
Wookie D*ck
 
russc's Avatar
 
Join Date: Apr 2006
Location: Vancouver, BC

You mean how in the second photo they separate the chamber plug and valve body into two separate pieces?

Yep, that would give you way more volume, the only trick is adding extra o-ring grooves to make sure it's sealing.
__________________
Quote:
Originally Posted by agentSmith View Post
oldschool play is about sportsmanship and respect, oldschool gear is available on Ebay.
russc is offline   Reply With Quote
Old 01-31-2012, 04:00 PM   #9 (permalink)
Simple mind - beware
 
Chaz's Avatar
 
Join Date: May 2008
Location: Ajax, Ontario, Canada

russc - I was talking about this one.

__________________
Quote:
Originally Posted by Mar View Post
I googled: "Lube and SPace Dildo" and it brought me here... totally not what I meant, but I found a nice niche market to peddle my homo-erotic comedy routine so here I am.
Quote:
Originally Posted by Mayvik View Post
9 times out of 10, it's an electric razor. But sometimes...

it's a dildo.
Me Feedback
Chaz is offline   Reply With Quote
Old 01-31-2012, 04:02 PM   #10 (permalink)
Wookie D*ck
 
russc's Avatar
 
Join Date: Apr 2006
Location: Vancouver, BC

Yes the o-ring that is to the left of the transfer port is essential, otherwise you get a leak down the barrel.
__________________
Quote:
Originally Posted by agentSmith View Post
oldschool play is about sportsmanship and respect, oldschool gear is available on Ebay.
russc is offline   Reply With Quote
Reply

  mcarterbrown.com » Paintball » The Armory » Sheridan

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -4. The time now is 08:58 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO
© MCB Network LLC