there is no valve to the switch in mine. there's an aluminum bung screwed into the top of the tank that I took off to check/clean out mine. that bung is tapped with four holes, one for the main air output, one for the pressure gauge, one for a manual control safety valve that I'm guessing blows when it reaches a certain pressure, but has a ring on it that you can pull open manually; and the last is where the power control switch screws in. there's a brass fitting on the top of the tank that the inlet air from the pump goes in. on the side of that is the small 1/4" line that runs over to the pressure switch that the main switch can activate (which is the one sticking open til 150 in my issue here) are you saying that brass inlet/bleed off tap might have a one way valve? I guess I can't wrap my head around how the air side of the bypass switch could be the issue - it's the shutoff switch that's engaging the bypass air valve open.
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