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Originally Posted by bobkoure
Why not just add a small integral-to-the-housing reservoir over the inlet? Returned flow can then come in from whatever angle without restriction. If these are going into OEM situations where there are flexible hoses, then you need some kind of reservoir anyway, to make up for losses through the tubing. You could even integrate a pair of contacts at the "minimum fill level" and let your OEMs use a capacitive circuit to warn the user to refill (or whatever).
Just a thought, of course...
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I wonder if a solution will show as an aftermarket part. There are already two solutions for the DDC in germany. One that gives and axial inlet in addition to the usaual two and one that integrates a header tank.