Date registered: Sep 2006
Vehicle: 2k SlK230 / 2KSlk320 / 2000 Toyota Tacoma, 95 Land Rover D90 (done) Now looking for a series IIA
Location: Utah-ha hah!
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If you end up destroying the flanges no worry you can just get a pair of "Nut and Gromet" adapters for any size pipe from 1/2 inch all the way up to 4 inch.
as for the flow valves Bell & Gosset is your best bet.
Your system must be an old steam heat system converted to hydronics because all of the hydronics systems I have tinkered with have shut off valves before and after the tank.