Pinch valve question?

[ray sowers]

Originally Posted by Bill Baer

I have always used an inline Co2 cylinder with a pinch valve to slow the opening rate when the stop comes off and I recently read an article in a magazine that indicated that pinch valves could be a source of inconsistency in air cylinders and after reviewing my data it appears that it may be so. Does or has anybody else out there have data or experience on using and not using a pinch valve?

I have many years industrial experience with air and hydraulic operating systems, what is a pinch valve? I have always used flow control valves including on race cars.