Biogas plants are complex processing systems built from many different components. Each of these components is subjected to the highest demands. In this context, knife gate valves must be completely bubble-tight. This is true for all the raw materials needed to produce alternative energies, whether food, leftover food, manure, untreated wastewater, or agricultural waste. The unique design reliably guarantees both zero leakage in the seat area and towards the atmosphere. This makes our knife gate valves the perfect solution for biogas plants, as they have been for decades.