Videos - Slow Maxon Valve

Above is a video of a Maxon Automatic fuel shutoff valve that takes approximately six seconds to close.  This particular valve also had a tenancy to stick about half way open and never shut without assistance.   The set point of the proof of closure switch is critical to this type of failure (often from the "factory" the proof of closure is set at approximately 50% of the valve wide open.  As a piece of anecdotal information this was the upstream valve.  The downstream valve had a fairly large leak.