
RFA is a series of breathing valves without a flame arrester, available in sizes from DN50 to DN300 and dedicated to installations requiring high inhalation capacity. They have discs integrated into one unit, as in the case of EFA, but their disc proportions have been reversed to obtain the highest possible vacuum throughput parameter. Their main tasks are to automatically regulate the pressure inside the tanks and prevent spontaneous emission of vapors into the atmosphere. They are class II 1 G c T6 devices, therefore they can be used in any explosion hazard zone. They have discs integrated into one unit, thanks to which they have compact dimensions and low weight.
EN 1127-1
Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and methodology
EN 13463-1
Non-electrical equipment for use in potentially explosive atmospheres - Part 1: Basic method and requirements
EN 13463-5
Non-electrical equipment intended for use in potentially explosive atmospheres - Part 5: Protection by constructional safety 'c'
ISO 28300
Petroleum, petrochemical and natural gas industries — Venting of atmospheric and low-pressure storage tanks
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