IIRC, My releif valve would be set at the highest pressure if it was screwed in all the way in and the relief setpoint was lessened by unscrewing the adjustment head. With the pump running and the diffusers bubbling, seeing about 5 psi on my system and the relief valve turned all the way in...I stared to choke the air off to the diffusers until I got a steady 10 psi reading, then I started to loosen the releif valve until it popped off. At that point, I opened the air control valves to the diffusers until the releif valve closed back up (I might of had to turn the pump off to get the relief valve to reset I don't recall). Then I started to choke the diffusers again and as the presure went up, I watched the gage and listened for the relief valve to open. I had to do this a few times to get the relief valve set at the 10 psi mark as it is not the most precise valve out there, but once I got the releif valve to pop open at 10psi on the gage...I was done (after I opend the flow back up to the diffusers, of course).
Some of these relef valves also work for vacuum and the postion of the ball and spring inside have to be reversed to work in the opposite direction. Mine needed the ball to go in first...then the spring. My style of releif valve is not a pressure regulator, but just a "pop-off" at the set pressure.
Last edited by Quarter Acre; 05/08/20 07:38 AM.
