Product Type: QZF-89 Features: ventilation QZF-89 all-weather fire breathing valve is installed in a fixed roof tank, from reducing evaporation loss of oil control tank pressure and prevent flame passed outside role. The valve has a ventilation volume, small amount of leakage, corrosion resistance and other characteristics, and a static ground wire, so that the valve and the tank to keep such potential. The valve has antifreeze properties, suitable for cold regions. Details QZF-89 all-weather fire breathing valve: a, QZF-89 all-weather fire breathing valve performance and features: The ventilation valve is installed in a fixed roof tank, from reducing evaporation loss of oil control tank pressure and prevent incoming external flame effect. The valve has a ventilation volume, small amount of leakage, corrosion resistance and other characteristics, and a static ground wire, so that the valve and the tank to keep such potential. The valve has antifreeze properties, suitable for cold regions. Two, QZF-89 all-weather fire breathing valve technical parameters: positive pressure 353Pa (36mmH2O), 980.7Pa (100mmH2O) negative 294.2Pa (36mmH2O) three, QZF-89 all-weather fire breathing valve parts material: Body material Carbon steel WCB , 304,316 stainless steel, aluminum positive pressure valve plate material stainless steel 304, aluminum vacuum valve plate material stainless steel 304, PTFE PTFE Ambient temperature ℃ -30 ~ 60 four, QZF-89 all-weather fire breathing valve shape Size: size Mounting dimensions (mm) D1 DLH Nd DN50 110 140 362 360 4 × 14 DN80 170 185 513 445 4 × 18 DN100 170 205 513 445 4 × 16 DN150 225 260 640 610 8 × 18 DN200 280 315 770 700 8 × 18 DN250 335 370 918 828 12 × 18 DN300 395 435 1050 910 12 × 23 five, QZF-89 all-weather fire breathing valve ordering: 1, ① product name and model ② ③ nominal diameter body material nominal ④ ⑥ ⑤ use media temperature ⑦ enclosure so we offer you the correct selection. 2. Please indicate any special requirements when ordering products 3, have already been selected by the design unit model, press the model directly to our Sales Department Order. 4, when the occasion is very important or the environment is more complicated, you try to provide design drawings.