Hello,
Have the Dream valve and wondering if anyone else is having issues with the plenum end to air gun blowing o-rings? Mine has held great since I got it a couple months back. Went out today to squeeze off a few down range and the gun was empty. Put it on the compressor and the leak was louder than the compressor. Took it apart to find the blown o-ring. Replaced it with a new stock o-ring and put it back on the compressor. Got upto 1200 PSI and the o-ring between the plenum and block where it swivels was leaking. Took it apart again, did some digging and found an o-ring for that, pumped it up again and then the plenum to gun o-ring blew out again.
Great fun.
What I found is the bevel cut on the Dream Valve is a shallower cut that the original tube air chamber to retain the o-ring in. Went through my small collection of stock o-rings thinking they were defective. I finally pulled out the calipers and started measuring to find the bevel difference. The stock o-ring is to large for the bevel cut on the Dream Valve. It looks like the bevel cut on the Dream Valve is about 30% less of an angle than stock making the retainment area for the o-ring to small for the stock o-ring size. To get the Dream Valve to completely capture the o-ring and prevent another blow out, I stumbled onto roughly a 10 MM ID by 2.6 CS ish. The o-ring that worked ended up having a cross section of 17.5 ish mm(outside to outside) when on the threaded stud of the gun. Don't rememmber the exact size of the o-ring(sorry), cause I tried quite a few to get one that wouldn't leak or blow out.
Pumped things up for the last o-ring experiment and it is still holding air.
Hope this helps anyone else who is unlucky enough to have this problem. I saw some mention buried in a thread, but wasn't sure it was at the plenum to gun connection.
Cameron
Have the Dream valve and wondering if anyone else is having issues with the plenum end to air gun blowing o-rings? Mine has held great since I got it a couple months back. Went out today to squeeze off a few down range and the gun was empty. Put it on the compressor and the leak was louder than the compressor. Took it apart to find the blown o-ring. Replaced it with a new stock o-ring and put it back on the compressor. Got upto 1200 PSI and the o-ring between the plenum and block where it swivels was leaking. Took it apart again, did some digging and found an o-ring for that, pumped it up again and then the plenum to gun o-ring blew out again.
Great fun.
What I found is the bevel cut on the Dream Valve is a shallower cut that the original tube air chamber to retain the o-ring in. Went through my small collection of stock o-rings thinking they were defective. I finally pulled out the calipers and started measuring to find the bevel difference. The stock o-ring is to large for the bevel cut on the Dream Valve. It looks like the bevel cut on the Dream Valve is about 30% less of an angle than stock making the retainment area for the o-ring to small for the stock o-ring size. To get the Dream Valve to completely capture the o-ring and prevent another blow out, I stumbled onto roughly a 10 MM ID by 2.6 CS ish. The o-ring that worked ended up having a cross section of 17.5 ish mm(outside to outside) when on the threaded stud of the gun. Don't rememmber the exact size of the o-ring(sorry), cause I tried quite a few to get one that wouldn't leak or blow out.
Pumped things up for the last o-ring experiment and it is still holding air.
Hope this helps anyone else who is unlucky enough to have this problem. I saw some mention buried in a thread, but wasn't sure it was at the plenum to gun connection.
Cameron