According to the national standard "code for fire protection design of petrochemical industry > (GB50160-90) regulations," a fixed roof tank B liquid, application of flame arrestor and breather valve. Breather valve and flame arrestor are indispensable safety devices.
The utility model not only can maintain the air pressure balance of the storage tank, ensures that the tank is damaged in the overpressure or the vacuum, but also can reduce the volatilization and the loss of the medium in the tank. The valve is installed in the nitrogen sealed tank top, tank pressure is to maintain balance, reduce product safety and energy saving medium volatile, often associated with the use of flame arresters. The valve is mainly used for the recovery of environmental pollution and endanger the safety of toxic and harmful gases.
1, storage: the above products are shipped to the site, if not installed or after the factory overhaul, rainproof facilities should be stored in a warehouse; emergency vent manhole series products not inverted during transportation.
2, maintenance:
A, the breathing
A, the breathing valve series, the staff should be monthly on the tank top check, check valve plate, valve seat, valve stem, valve cover and other parts of any dust, dirt, if any, should be clean dry static; every six months, to the valve sleeve and the valve rod wipe of transformer oil.
B, each half staff should check the fire breathing valve of the fire resistant layer at a time, if there is dirt, impurities clogging the fire resistant layer, fire resistant layer should be removed, remove stains with corresponding solvent, then rinse clean dry static fire resistant layer, put into the housing in the ventilation drying after.
C, more than the product shell inside and outside the surface of the paint should be re painted every year again.

Shell material: carbon steel, stainless steel (SUS304, SUS304L, SUS316, SUS316L), fluorine, plastic.
Internal core: valve disc, valve seat, valve stem, valve cover.
Internal core material: stainless steel or ptfe.
Sealing ring material: ptfe.
Fire retardant material: stainless steel.
Ambient temperature: -40~+60.

I produced the breathing valve, has the advantages of compact structure, large amount of ventilation, a small amount of leakage, corrosion resistance, good sealing performance characteristics. Recently developed explosion-proof arrester breather valve with international standard (HXF-IZ), Zuhuo is located in the breathing valve at the inlet, thoroughly eliminating fire into the breathing valve shell in vivo. Has the advantages of small volume, light weight, maintenance, cleaning, replacement features convenient etc..
Disc with PTFE material, with low temperature, antifreeze and other advantages. An electrostatic output device is arranged in the valve, so that the valve is kept equal to the tank body at a time.
Operating pressure:
A type: +355Pa (+36mmH20), -295Pa (-30mmH20)
B type: +980Pa (+100mmH20), -295Pa (-30mmH20)
C type: +1750Pa (+180mmH20), -295Pa (-30mmH20)
Type D: special pressure, user specified.
Explosion proof grade: 5501:IIA IIB, BS, IIC.

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The fire breathing valve under normal operating conditions, the fire breathing manhole remained sealed, under normal pressure tank. When the breathing valve work can not meet the accidental reasoncreated tank sharp overpressure, pressure cover is automatically opened breathing manhole, emergency relief, the pressure in the tank to keep normal; when the tank pressure or vacuum rapid decompression when the suction valve opens sharply inhaling atmosphere, maintain normal pressure when the tank; the atmosphere with inhalation sparks, flame, fire resistant layer to "wall effect" to prevent flame through, to protect the safety of the storage tank.
Flange standard: GB, HG, SH, HGJ, JB, ANSL, JIS and other standards. (user specified, please specify pressure level)
Manufacturing, testing standards: according to (oil tank breather valve) SY7511-87, (petroleum tank fire arrester performance and test methods) GB5908-86 standards such as manufacturing and acceptance; or user specified standards.