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I have flown in a friends L4P who has the trim servo on the flapper valve like Bob describes and it works very good. He has a switch on the overhead duct that opens or closes the flapper. This way you can leave it open for cooling as long as you want, and then close it when you want to pressurize.
The Dukes valve will over pressure when first pressurizing IF you don't have a vacuum line connected to the valve. The valve is Parked in the closed position and will work fine without the vacuum after the initial pressure spick. If you have vacuum it will lift the valve off it's seat and cause the pressurization to build from the open position and not have the pressure spick.
Just my input,
Jim Hergert
N6XE, "An Sex Y" L4P
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