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The world’s only ATEX intrinsically safe fail freeze valve introduced by IMI Precision Engineering

17 September 2015

IMI Precision Engineering, the world-leading fluid and motion control specialist formerly known as Norgren, has introduced the world’s only 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 422IS’s fail freeze capability ensures 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 -10ºC to +70ºC with a supply pressure of 4 bar, the 422IS Fail Freeze proportional 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 422IS.

Stephen Turner, Product Marketing Manager at IMI Precision Engineering, explained: “The need to maintain piloting pressure in unforeseen conditions is vital for many chemical and energy applications. In many of these processes, the unexpected closure of a regulating valve can lead to loss of product to the user as a minimum – and in some cases, could lead to unsafe conditions such as build-up of gas pressure elsewhere in the system. The 422IS now limits the risk of these occurrences to the end user, removing the risk of over-pressurisation and allowing system designers to control the risk at source.

“Additionally, as ATEX IS certification removes the need for a pneumatic system at remote sites, designers have the option to pipe gas directly from the pipeline to control the system, which streamlines the initial installation and cuts both running and servicing costs over the life of the whole system.”

Norgren became IMI Precision Engineering in 2015, a brand which consists of a portfolio of flagship product brands including IMI Norgren, IMI Buschjost, IMI FAS, IMI Maxseal and IMI Herion.

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