Fike Corp. the USA-based global manufacturer and supplier of explosion protection systems, has introduced a new explosion isolation flap valve, the DFI.

Since 2010 the company has conducted substantial experimental research on the behaviour of dust flame propagation in industrial scale pipelines and passive explosion isolation systems. After earlier development of its ValvEx flap valves up to size DN400, Fike has now achieved safe passive explosion isolation up to DN800, thereby offering new attractive possibilities for safe powder and bulk dust handling process industries.

During a deflagration, DFI reliably isolates pressure and flames from interconnected equipment. Its lightweight-dual-flap mechanism – said to be unique – allows the device to close quicker than most single-flap valves, allowing it to be installed closer to a vessel, such as a dust collector.

“Fike's experience with traditional single-flap designs showed that they do not scale efficiently to larger diameters,” said Andrew Tworek, senior mechanical engineer team leader. “Heavier and more robust flap, shaft and latch assemblies react slower to deflagrations and impart greater collision loads at the sealing interface. A dual-flap design enables the assembly to be lighter weight, faster reacting, and ultimately a more reliable and cost-effective solution for large-diameter passive isolation.”

During research and development of the DFI, the testing and validation team documented inconsistencies found between testing setups suggested by standard EN16447 and actual industrial processes. Flap valves currently on the market, many of which are installed in systems throughout the world, were tested at Fike’s Remote Testing Facility. Of the flap valves tested, 13 of the 14 tests failed to isolate flames during a deflagration.

DFI was tested to exceed EN16447 requirements and simulate conditions it may experience during a real industrial deflagration. Fike’s European head office is in Herentals, Belgium. www.fike.com/products/dfi  
 

Fike’s DFI flap valve

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