The valve can be used in a ‘normally open’ or a ‘normally closed’ configuration, with very low pressure drop in both configurations. Saf-t-Flap can be placed both at the inlet and outlet of equipment such as dust collectors, isolating them from the effects of a dust explosion from both directions. In such an event, the valve shuts and latches closed to prevent flame and pressure from moving through the piping system. Where the flameball ejected by a deflagration is unacceptable and ducted relief is impractical, flameless venting technology provides an alternative passive protection solution.