Isolated VAG EKN ® Butterfly Valve in a gas-supply-pipeline Biogas is mainly produced by fermenting methane in raw materials, i.e. the fermentati- on of waste. However, depending on how it is produced, biogas may contain extremely aggressive impurities, such as hydrogen sulphide. And biogas prevails in a wide vari- ety of temperature ranges. Specially desig- ned valves need to be used in order to meet these requirements. Like any other valv

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