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I have never thought about the details of one of those valves. I suspect it has some kind of reed valve with a spring holding it which will hold the pressure needed to make the carb work correctly while allowing pressure higher than that to permit the excess fuel to move on and back to the tank.
The only thing that matters in your case is that it is under some pressure whenever the car is running excepting perhaps under full hard acceleration when the carbs might actually use all the fuel available (actually probably not too likely, IMHO).
If you are sanding a flat mating surface be sure to use a block.
Good luck.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.
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