Explosion proof fire-resistant breathing manhole is a safety device to prevent accidents caused by sudden overpressure or vacuum inside the tank. It is usually used in conjunction with stainless steel explosion-proof corrugated fire-resistant layer, which can not only prevent accidents caused by sudden overpressure or vacuum inside the tank, but also play a role in safety fire prevention. It is a safety device to protect the storage tank, especially suitable for storing materials in nitrogen sealed dome atmospheric pressure tanks. It has the advantages of constant pressure discharge, constant pressure suction, flexible opening and closing, safe fire resistance, compact structure, good sealing performance, and safety and reliability.

Main technical parameters:
• Suitable for the storage of various materials such as petroleum, chemical, pharmaceutical, energy, special liquids or gases;
• Operating pressure:- 100mmH2O～+1500mmH2O；
• Explosion proof level: BS 5501: IIA、IIB、IIC；
• Shell material: carbon steel, stainless steel: SUS304、SUS304L、SUS316、SUS316L、 Lining, etc;
• Valve disc and seat materials: aluminum alloy, stainless steel, etc;
• Material of flame retardant core: stainless steel explosion-proof flame retardant corrugated plate;
• Sealing material: nitrile rubber, polytetrafluoroethylene, metal gasket, etc;
• Flange standard: HG20592-97 PN1.0， Or GB, SH, HGJ, JB, ANSI, JIS, etc;
• Manufacturing and testing standards: Manufacturing and acceptance shall be carried out in accordance with standards such as SY7511-96 for oil tank breathing valves, GB5908-86 for fire resistance performance and test methods for oil tank flame arresters, or customer specified standards.
Ordering Notice:
　　Please specify detailed parameters such as product name, nominal diameter, pressure rating, material, flange standard, and operating pressure when placing an order. The above product parameters are for reference only. If you need other specifications and sizes, please feel free to call or write to us.