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zone valve question

We are installing a large (for us) boiler system of 1.2 million btu's. We have 6 zones of varying sizes. I usually use Caleffi Zone valves but their largest zone valve is 1-1/4" with a cv of 7.5. My biggest zone is 2." Should I reduce down to the zone valve or find another manufacturer that makes 2" zone valves? What problems could I be facing?

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