To expand on Miraculix's post. You mentioned having a valve on both ends. Is it possible you closed them simultaneously locking hot wort in the tube and let the chilling liquor continue to run through the shell, chilling the wort causing a contraction. If you want to simulate the problem, take...
You may want to check out our Turbonik Brush. It was designed to do exactly what you trying to do. You Tube Link shows how it works
The Turbonik Brush - Effortlessly Cleans Fermenting & Serving Vessels!
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For clarification, the $329.99 version of the Maxx counterflow wort chiller is the "Ready to Brew" version. The "Basic" TC version is available for $219.99 and comes with standard...
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We have the Turbonik Brush. It was designed to help with that problem. For beer stone I would remove the dip tube, lay the keg on its side with a pint of hot water mixed with Brewery Wash puddled on its side and have at it with at least a 1200 rpm cordless drill until clean. Then rinse using...