I have been wondering about the state of OPRV's on homemade air plasters, particularly the hose handle and ball valve kind, i want to know if you have a simple ball valve air blaster, and attach a ball pump to the blaster via PVC couplings, does there need to be a external OPRV too in the blaster or is the ball valve OPRV enough to hold the pressure. I created my own hose handle air blaster a few months ago but since i finished the project air has been leaking through the pump it self, in the shaft area with a small crack. I have tested the pump in water and found the leak, but all attempts to patch the leak fail, with super glue, epoxy. And also the hose handle baster cannot hold air pressure for more than 15 seconds before all the pressure is lost. There are no other leaks in the blaster and this has also been happening to my other blaster with ball pumps. Could it be that i am pumping too hard (3 pumps) and the air is leaking through the OPRV, or should that not happen?
Edited by Aeromech, 23 November 2015 - 01:37 AM.