... gong, short pipes Wet alarm valve (Check valve) 1) Item no.: ZSFZ100, ZSFZ150, ZSFZ200 2) Nominal diameter: 100mm, 150mm, ... 200mmWet alarm valve (Check valve)1) Item no.: ZSFZ100, ZSFZ150, ZSFZ2002) Nominal diameter: 100mm, 150mm, 200mm3) ... Nominal working pressure: 12 bar (1.2MPa)4) Strength test pressure: 48 bar (4 ...