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Posted: Wed Dec 13, 2006 6:00 am
by Hotwired
Hayseed, a 4" valve is a hell of a lot bigger than two 2" valves.
Diameter does not equal area.
Posted: Wed Dec 13, 2006 8:38 am
by squeaks
Yep, hotwired has got it on the money. It would actually take 4-2" valves to equal the same as one 4". Since a 4" valve would be super expensive you're best bet would either make a pneumatic piston for a butterfly valve or, as I said earlier, make two 3" valves.