Water systems for fire extinguishing – Filling and draining devices operated by remote control – Part 3: Valves for ventilation PN 16 of fire extinguishing pipe systems "wet/dry" and "dry"
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2003

Water systems for fire extinguishing – Filling and draining devices operated by remote control – Part 3: Valves for ventilation PN 16 of fire extinguishing pipe systems
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2012