ARCA Regler GmbH, Tönisvorst, Germany delivered several control valves for the second largest natural gas reservoir in Central Europe, which is located in Haidach, Austria. After two years of construction the first extension of the biggest natural gas reservoir of Austria has been put into operation around June of this year. The reservoir is capable of storing in this first extension 1.2 billion m3 natural gas. After completion of the second extension the storing capacity will double again and than be equivalent to approximately a quarter of the Austrian annual need for natural gas. The valves that have been delivered by ARCA will be used in the gas drying plant as well as in the rejection process.