Flame retardant cap is an essential safety component in the storage of petroleum products, which is widely used in the process of storage and operation of petroleum products. The filter core of this product is made of stainless steel cold sheet. Corrosion resistance, can meet the need of oil storage and ventilation. Breathable cap components designed for the overall independent, one curing, to ensure that the size of the bellows is stable, easy to clean. Fire resistance ventilation cap is for the gas station, a small tank ventilation pipe designed to upgrade products, it adopts stainless steel roof cap, with the middle element standard, keep it in enough permeability on the basis of compact structure, light weight, small volume, convenient maintenance and replacement.

壳体材质	碳钢、不锈钢
阻火芯件材质	不锈钢防爆阻火波纹板
密封件材质	耐油石棉橡胶、聚四氟乙烯
防爆级别	BS5501：IIA、IIB、IIC
工作温度°C	≤480
公称压力MPa	0.6-5.0（150-600Lb）

阻火透气帽的顶帽采用耐火铝板，壳体为铸铝。阻火芯有不锈钢波纹板和铝波纹板两种，符合CB-5908-2005的技术要求。当油罐料膨胀或进油时，即通过阻火芯波纹板向外排气。当油罐内向外放油时又向罐内吸气，并阻止和杜绝火源从此通过，确保油罐安全。

DN	L	H
40	180	160
50	180	160
80	210	125
100	250	155
125	290	175

透气帽应垂直安装在油罐的顶部，确保罐内外压力的平衡。从而保证罐体和加油站的安全。