[EricH]

Before you read <R72>, read <R71>.

And then pay special attention to <R72-C>, second sentence. What you're looking for falls into the category of "such valves". As such, it cannot have a Cv of more than 0.32 or a port diameter of more than 1/8".

Disagree with the rules or our interpretation of the rules? Submit a question to the GDC via the official Q&A. Should they rule that such a valve is in fact legal, then please print out the ruling and bring it to competition. The inspectors may or may not get the memo before the event. If you don't do this, and then you show up with an illegal configuration, expect to sit out until it is fixed.