Not really disagreeing with 15Hg with a 20HP 36 blower . However I have noticed for instance that Prochem sets their Blazer's 36/3L relief valveIf it said 15 that's what I would set it at. With out hoses.
I have a lot of questions, but about 15 years ago I had a similar situation. The petroleum hose from the blower to the tank had delaminated and loaded the blower hard with the lid of the recovery tank. Do you think there's an issue from the blower to the tank?On my Bluewave my hg gets up to 18 or 19 and shits the machine down. I have taken valve apart and out multiple times. Any thoughts on what I can do. I can hold valve slightly open and it does not shut the machine off. This is when the hose and wand is hooked up.