DFI – Dual-Flap Isolation Valve

The DFI is a check valve for passive explosion decoupling. The operation of the DFI valve is passive (flow actuated), which means that no external energy is required to close the valve flaps when deflagration occurs. When process air flows through during regular operation, the air pulls or pushes the valve flaps open, allowing air to flow from the process to the protected area. When deflagration occurs in the protected area, the explosion pressure created causes the process air flow to reverse and close the valve flaps, preventing the deflagration flame front from spreading upstream beyond the valve.