ATEX Intrinsically Safe fail freeze valve

22 September 2015

IMI Precision Engineering has introduced what it believes is the World’s first fail freeze proportional valve to be certified ATEX Intrinsically Safe (IS) for use in hazardous environments. 

The 422IS Fail Freeze valve is ATEX-accredited to operate in certified areas and can also pilot flammable gases rather than compressed air, negating the need to generate compressed air at remote sites.
Already regulating gas supply to some of the UK’s largest cities, the units fail freeze capability is said to ensure safe, uninterrupted gas supply to end users by continuing to accurately pilot the gas regulator even in the event of a power outage or signal disruption. Upon loss of power, the valve will continue to regulate at the last set output pressure with a high degree of accuracy. 

Able to operate across a temperature range of -10°C to +70°C with a supply pressure of 4 bar, the valve uses less than 0.15 watts of energy when adjusting pressure and actually uses no power once in position. Both the linearity and hysteresis are scaled to less than 0.5% of span for optimal performance, while in addition vibration and orientation have minimal effect on the performance of the unit. 

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