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Failsafe System on a Metal Detector
Alarm for failsafe valve on metal detector but the alarm does not sound immediately when it is switched off

We have a failsafe valve on our metal detector but the alarm does not sound immediately as soon as it is switched off.

Our valve is place at a point close to where the air comes in at not at the point before the pressure is coming out (automatic blow rejection metal detector). Is this the issue? Do we need to move the valve or are there legal placement areas for a failsafe valve to be placed?