Deflagration = Explosion propagating at subsonic velocity

Detonation = Explosion propagating at supersonic velocity and characterized by a shock wave.

Flame propagation is stopped through used liquid.

Foot valve flame arrester prevents light-back at deflagration and stable detonation of potentially explosive vapor-air, and or gas-air mixtures in a pipe that is located upstream of the ignition source.

Foot valve flame arrester is installed inside the storage tank at end of suction line. Foot valve flame arrester has two functions. At first, the tank is protected in case of flame propagation from pump side to the tank through the liquid in the strainer and second the liquid column is preserved by the integrated check valve.