Mechanical explosion isolation systems: Responsive mechanical explosion isolation systems, commonly referred to as Fast Acting valves (FAV), are designed to act upon the detection at the incipient stage of combustion by mechanically isolating the combustion and preventing flame propagation. The Fike Explosion Isolation System proceeds through 3 basic sequences to provide successful activation: detection, initiation and closure of the valve. The Fike Fast Acting valve is the critical element in the sequence of successful explosion isolation. The rapid closure provides the physical barrier which prevents flame propagation beyond the isolating valve location.