flow-control and butterfly valves

Herb_2

I am replacing two small radiatiors supplied by a two-pipe system (one supply,one return). The pipes are one-inch in diameter to within four feet of each radiator, where the pipe is reduced to half-inch. I have been told to install a flow-control valve at each point where the pipe is reduced, although the existing system has no such devices. Questions: 1. Are such valves necessary and how do they operate? 2. Where exactly do I place these valves--before the T (on the 1" pipe), or after the T (on the 1/2" pipe)? 3. Would there be any advantage to reducing the pipe in stages (from 1" to 3/4" to 1/2"), as opposed to going directly from 1" to 1/2"?

Mark Eatherton1

More questions, then answers...

I'm trying to visualize in my minds eye what you're talking about, and I want to make sure we're on the same page before I make a suggestion. Do you have one pair of 1" lines serving two radiators, and the line goes 1 X 1/2 X 1/2 or do you have 2 completely different 1" lines serving 2 radiators reduced to 1/2" just before the radiators?

If you could make a schematic using Paint, and save it as a JPEG you could show us what you have.

Thanks!

ME

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