Why does a 1" zone valve have a tiny 3/8 port?
My indirect was originally installed with 3/4 rather than 1" (long story, salvaged unit tacked on existing zone manifold). I've gotten everything needed to redo the zone to 1", and when I looked at the valve, I was startled to see it has a 3/8 port! Isn't it stupid then to do all this work to speed the recovery time of the tank if the port is only 3/8"? Is this the normal ratio of port to pipe? Perhaps this is one of those pipe turbulence friction things of why a big pipe is needed but small valve port. I guess I've never looked at a 3/4 valve's port, is it 9/32?
I thought I was doing this to increase the GPM flow to the tank. Given the short run from boiler to tank, wouldn't I get as much bang by just upsizing the valve rather than tearing down the whole manifold to upsize the entire tank zone? A 3/8 port to a 3/4 pipe shouldn't be excessive flow? Or am I just not getting it?
Researching valves. I see I can get a 3/4 White Rodgers 1361-102 that has a 23.5 Cv instead of the standard Honeywell 3/4 that has a 3.5 Cv. Is this the right move, get 6.7 times the flow, and bag upsizing the whole zone?