Passive Isolation Valves Curbing Incipient Explosions within the Process
IEP Technologies’ passive isolation valve, Isoflap flap valve, enables passive explosion isolation for installations with combustible dust in order to prevent an explosion from spreading to upstream equipment.
Constructive explosion protection through pressure relief is an essential factor in curtailing unpredictable hazards and damage caused by the explosion of combustible dusts in industrial plants. For optimum protection, it is necessary to minimise the risk of explosion transfer between interconnected containers. IEP Technologies have developed the Isoflap flap valve for this purpose.
The passive isolation valve enables effective passive explosion isolation for installations with combustible dust in order to prevent an explosion from spreading to upstream equipment, states the company. This solution meets the requirements of Din 16447 and is now available and can be ordered in various sizes between DN 100 and DN 1000.
Typical application scenarios for the flap valves are found in intake explosion isolation for dust collectors, centrifugal separators and other process equipment. The solution consists of effective, self-acting devices that ensure explosion isolation at the intake of protected containers with combustible dust, adds the firm. The company offers users a certified and repeatedly tested valve with both of the available versions, Isoflap and Isoflap-M.
The Isoflap version has been certified by a third-party company in accordance with EU Directive 2014/34/EU (Atex Directive) and approved for decoupling in the event of dust explosions. Isoflap-M also includes an integrated function to monitor dust accumulation in the valve body and flap position in accordance with the Osha Directives on combustible dust and NFP 654 and NFPA 69 standards, mentions the firm.
Both versions have robust valve bodies made of carbon steel and a flap made of high-quality stainless steel alloy. During normal operation, the flap remains open due to the air flow. In the event of an explosion, the pressure front closes and blocks the flap, thus preventing the flame and pressure from spreading to upstream areas of the system. Also available is the Isoflap-M interface module, a system monitoring device intended for use with the Isoflap-M version of the flap valve. According to the company, the advantages include a passive design without activation sensors, EN 16447 certification, a low pressure drop and short installation distances.