I'll give it a try and let you know. I think that the entire hole is epoxied, but I'll investigate further and let you know. Thanks. As an emergency plan B, I quickly built a Quad 1" pneumatic valve, SDR-21 golf ball cannon for Saturday. Quickly is quite the joke. I haven't slept much over the past ...

1. Removed the flow control mechanism by unscrewing the top screw and unscrewing the bottom piece. 2.)Tapped and inserted a 1/4" NPT fitting in the top of the valve. 3.) Removed the Solenoid, and filled the hole with epoxy. Without the bottom part of the flow control valve, all the air from the cham...

Don't see any small metal pin. I drilled a small hole through the diaphragm to help equalize the pressure, and the air still escapes through the pilot tube instead of the barrel. this might be your prob try filling the hole with epoxy Check that the seat where the diaphram seals there is no dirt or...

SpudStuff wrote:on the second picture is thAT your barrel attached to the valve or your chamber

That's the chamber. It goes in the direction of the arrow. For kicks I even tried backwards. Obviously, doesn't work.

OK, it took all night to remember how to post photos. Here is the inside of the top of the valve: http://web.tampabay.rr.com/zzzzdoc/images/Inside_Top_of_Valve.jpg The valve from the outside looks like: http://web.tampabay.rr.com/zzzzdoc/images/Outside_of_Modified_Valve.jpg The diaphragm with the ne...

Don't see any small metal pin. I drilled a small hole through the diaphragm to help equalize the pressure, and the air still escapes through the pilot tube instead of the barrel. I officially have no idea why this isn't working. I've never had any trouble modifying 1" valves. As a change in tack. Wo...

I found the regulator from Palmer's Pursuit Shop (an internet paintball store) to be very small and work great. https://palmer-pursuit.com/ecom/index.php/cPath/22_23?osCsid=cc6514bf7619aeb643eb09831d2b6dbf Look for the low pressure version (200 psi max). You'll need to add your own secondary regulat...

Anyone have a link to predict the distance a golf ball will travel from an SDR-21 sleeved barrel. I have a ballistic chronometer, so I can measure the velocity of the ball as it leaves the barrel (max 285 fps so far, hoping for a lot higher. I haven't found anything that produces results that can us...

I don't remember seeing a small metal pin when I disassembled the valve. I'll look again. Are you taking about the 2" Orbit valve. They look different than the 1" ones.

I'll have to post some pictures later. Meanwhile, I'll look for the small pin through the diaphragm.

Thanks for the ball valve tip, but that will just mean that all of the compressed air will escape through the ball valve quicker. Nothing is going through the barrel.


Anyone, anyone.... Bueller??

Doesn't the medium in which the projectile travel mean more than the medium in the chamber?

I mean it's nice to build a hydrogen gun, but won't it still be irrelevent if the gun is shooting the projectile in air?

So this means that using CO2 (atomic weight 44) will provide a slower velocity than air or the other less dense gases like H2 (atomic weight 2) and He (atomic weight 4)?

Need some help here. I've taken a 2" Orbit sprinkler valve and modified it for pneumatic triggering with a blow gun. I've taken out the flow control valve in the top, threaded the section, and installed pneumatic fittings to a blow gun. When I first tried this, all the air leaked out the blow gun wh...

I'm actually working on getting some sdr21 sleaved from Pimpmann, so that may very well be the next barrel for my gun. It would likely have to be a non-coaxial design (I can't imagine having a 4" barrel with sleaved sdr-21 inside 2" sch 80, but I guess anything is possible.

I'm building my second golf ball cannon. My first one (Two 3 ft x 2" PVC chambers dumping through a single 1" sprinkler valve into 3 ft of Schedule 80 PVC) could only send a golf ball somewhat over 300 yds. I also noticed that a good 40psi was left in the chamber after firing, so I think there was a...