Not trying to start an argument or be a "wise A$$" here BUT, having retired from power production after 25 years I have seen many "automatic" "fool-proof"valves (both high and low pressure) fail.
Give me a good "ball type" valve with a handle that one can SEE what position it's in any day.
One thing I have come to miss trust under any conditions is a "QUICK COUPLER" of any kind, they all leak through at some point and a low pressure situation is the worst .
The real point in switching pressure systems of any kind is "presence of mind" , if you are in any way distracted or otherwise impaired , you most likely should not be doing the job in the first place.
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DE: John W9WLS
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