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DIN 3450
Industrial valves – 3-way-valves – Marking of flow direction, position and construction type
FprEN 17450-3
Fixed firefighting systems - Components for water mist systems - Part 3: Requirements and test methods for check valves
DIN 30652-1
Excess flow valves - Part 1: Excess flow valves for gas installation
DIN 30652-2
Excess flow valves - Part 2: Excess flow valves for service lines