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Alan, Why did you have the first stage without spring connected to the low pressure side of a separate normal first stage? I think you can accomplish air compensation with only the single first stage with no spring. I also think you need to have the compensation hose connected to something that will contain the pressure as opposed to just putting the hose in water as it sounds like you did. Without a sealed end you end up with the same amount of pressure on both sides of the first stage piston (assuming a piston arrangement) which I think would lead to the high pressure valve inside the first stage opening indiscriminately. Back pressure is required. Somewhere along the way, I don't recall if it was when I talked to Karl at UI, or maybe what I read on this list, Karl has no pressure release valve on his motors but just lets the air bleed out through the motor housing seals when it is strong enough to do so. That insinuates the motors are always under some amount of positive pressure above ambient providing the back pressure needed to seal the high pressure valve and keep air from bleeding out. Jon On 2/14/2012 2:41 AM, Alan James wrote:
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