Breathing valve and flame arrester are indispensable safety facilities for storage tanks. 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.
Breathing valve is to maintain the tank pressure balance, reduce the volatile media security and energy saving products, often with the use of firearms.

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

Single call valve has: compact structure, large ventilation capacity, small leakage, corrosion resistance, good sealing performance and so on.
Disc with PTFE material, with low temperature, antifreeze and other advantages. The fire site is located at the mouth of the incoming call single valve, and completely eliminate the fire into a single exhalation valve shell. With small size, light weight, maintenance, cleaning, replacement 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: -295Pa (-30mmH20) +355Pa (+36mmH20)
B type: -295Pa (-30mmH20) +980Pa (+100mm H20)
C type: -295Pa (-30mmH20) +1750Pa (+180mm H20)
D type: -295Pa (-30mmH20) +9800Pa (+1000mm H20) (special pressure, user specified.)
Explosion proof grade: 5501:IIA IIB, BS, IIC.

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.

Single call valve in the pipeline is generally installed horizontally. Single call valve make full use of the pressure bearing capacity of the oil tank to reduce oil vapor emissions, the principle is to use the weight of the valve plate to control the tank positive expiratory pressure and suction negative pressure. Single call valve make full use of the pressure bearing capacity of the oil tank to reduce oil vapor emissions, so that the pressure inside the tank does not continue.