I was thinking some today and wondered if you are still using the same chiller setup to maintain the block inlet temp at a given set point. As far as how the loop is set up: Does the chiller constantly recirc through a reservoir and a separate pump controls the block loop? If not consider a 3 way valve. Constant temps will be easier to maintain with consistent flow through the chiller. I looked at what I have left for magnetic valves, unfortunately the smallest I have is a 1'' fpt with an iron body.....nuf said there, not exactly a good match. Very accurate valves though, I came across the demo unit for the valves. It consists of a controller its head end board and one of the valves which is cut away to expose its innards. The bottom is drilled out to allow insertion of a dial indicator, which is part of the display. I played with it a little and found for a given input the valve position is repeatable within a couple of thousands of an inch for what it's worth.
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