Posted by: Dale "Head_Hunters" DuPont on May 30, 2003 at 11:42:50

: : : In my Quest for a High Pressure Cannon Valve I was told by an manufacturing engineer that 300 psi is about as high as one can go and not get leakage past very tight tolerance and very high Quality O ring seals. Bought one to play with for about $40 rated at 275 psi. Worked on single paintballs volume wise. : Are you kidding? Every cheapo paintball gun out there has a valve that operates at 900 psi with no leakage. They use a cup seal and the valve body uses O rings that are entirely enclosed and stationary. O rings that slide accross ports with high pressure tends to get shredded. Think of the CO2 tank Oring that gets trashed in short order if you don't relieve the pressure before the O ring reaches the edge. : And I know at work we have O-ring seals that operate at 8,000 (yes, 8 THOUSAND) psi with no leakage. That is a hydralic system. They do use O rings. But the valves and piston seals don't have O rings going over valve ports. By the time you get the ports small enough to keep the O rings intact one has volume problems again. Now, if one is willing to use up some air with O rings leaking some air past them, then yes it could work. But one couldn't charge the resevior and walk around with it for an hour and not waste a lot of your air supply. But if you didn't charge it until you were ready to shoot then It would be feasible... Now when I get my lathe, One of my First Project will be an oversized bore paintball valve and hammer. Why reinvent the wheel? We just need it to pass more volume...... Think a 1 inch internal bore paintball valve would shred a nerf rocket out of a 10 inch barrel? Tennis balls would probably go about a half mile out of a 3 foot barrel.

Follow Ups: Re: Valve Design Dave Hall 14:44:48 05/31/03 (0) Re: Valve Design Michael "LCT_Paintball" Lyon 14:31:11 05/30/03 (1) Re: Valve Design Bill "Capt Bill" Tison 21:46:32 06/01/03 (0) Post a Followup Show your name as: DefaultRealnameBothNickname E-Mail address (eg: joeschmoe@aol.com): Show your e-mail address? DefaultYesNo Your Password: Don't have a password? CLICK HERE - Forgot your password? CLICK HERE Subject: Subject:Message: : : : : : In my Quest for a High Pressure Cannon Valve I was told by an manufacturing engineer that 300 psi is about as high as one can go and not get leakage past very tight tolerance and very high Quality O ring seals. Bought one to play with for about $40 rated at 275 psi. Worked on single paintballs volume wise. : : Are you kidding? Every cheapo paintball gun out there has a valve that operates at 900 psi with no leakage. : They use a cup seal and the valve body uses O rings that are entirely enclosed and stationary. O rings that slide accross ports with high pressure tends to get shredded. Think of the CO2 tank Oring that gets trashed in short order if you don't relieve the pressure before the O ring reaches the edge. : : : And I know at work we have O-ring seals that operate at 8,000 (yes, 8 THOUSAND) psi with no leakage. : That is a hydralic system. They do use O rings. But the valves and piston seals don't have O rings going over valve ports. : : By the time you get the ports small enough to keep the O rings intact one has volume problems again. : Now, if one is willing to use up some air with O rings leaking some air past them, then yes it could work. : But one couldn't charge the resevior and walk around with it for an hour and not waste a lot of your air supply. But if you didn't charge it until you were ready to shoot then It would be feasible... : Now when I get my lathe, One of my First Project will be an oversized bore paintball valve and hammer. Why reinvent the wheel? We just need it to pass more volume...... Think a 1 inch internal bore paintball valve would shred a nerf rocket out of a 10 inch barrel? : Tennis balls would probably go about a half mile out of a 3 foot barrel. [ Follow Ups ] [ Post Followup ] [ WARPIG Tank Talk ]