My Conn 80A, my Getzen 700 and even my Chinese pocket trumpet work as you've described, but none of the three valves on my flugelhorn appear to pass any air -- they barely move with the bottom cap hole plugged. Yet with the holes unplugged, the valve action is fine.
Getzen Eterna 700
Conn Victor 80A
Conn Connqueror (1903)
ACB Doubler Flugelhorn
Mendini Pocket Trumpet (with tuner and white glove)
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