The QFQ all-weather storage tank breather valve is an automatic pressure balancing device installed on the top of fixed roof tanks. It independently operates the pressure disc and vacuum disc to intelligently regulate the pressure difference between the tank interior and the atmosphere. When the tank pressure rises to the set opening pressure, the pressure disc opens to release excess gas; when the tank vacuum reaches the set value, the vacuum disc opens to admit external air, effectively preventing tank deformation or rupture due to overpressure or excessive vacuum. The valve features an all-weather rainproof and dustproof structure. Its core purpose is to provide safe and reliable breathing protection for various liquid storage tanks in petroleum, chemical, storage and transportation industries, automatically balancing the pressure difference inside and outside the tank during filling, discharging, or ambient temperature changes, reducing media evaporation loss, and ensuring tank structural safety and environmental compliance.

QFQ all-weather tank breather valve product diagram

1. All-weather protection design: A rain cover on top prevents rain, dust, and debris from entering, ensuring normal operation in harsh weather.

2. Independent dual disc operation: Pressure and vacuum discs operate independently without interference, achieving precise control of set pressure and vacuum opening/closing.

3. Reliable sealing with set pressure opening/closing: Flat or tapered hard seals (soft seal ring optional) provide stable opening and reseating pressures with zero leakage when closed.

4. Multiple materials for corrosion resistance: Body available in cast steel, stainless steel, or aluminum alloy; discs and internal parts optionally in stainless steel or PTFE, suitable for oil, chemical solvents, and other media.

5. Optional flame arrestor structure: Can be equipped with an internal flame arrestor layer (corrugated plate or wire mesh) to prevent external flames from entering the tank, meeting fire protection requirements for petrochemical storage tanks.

6. Large ventilation capacity with low pressure drop: Optimized flow path ensures low breathing resistance and high capacity, maintaining stable pressure during rapid filling or discharging.

7. Easy maintenance: Simple structure with removable disc assembly for convenient periodic inspection and cleaning, ensuring breathing sensitivity.

8. Compliant with relevant standards: Designed and manufactured according to SY/T 0511 “Breathing valve for petroleum storage tank” and other standards.

Structural diagram of QFQ all-weather tank breather valve

Part List

Performance Specification Table

Outline drawing of QFQ all-weather tank breather valve

outline dimensional drawing

Due to the rapid R&D iteration speed of valve products from China kaiweixi Valve Group Co., Ltd., the above technical parameters and specification documents, including product overview, features, parts materials, outline dimension charts, CAD drawings, and product instruction manuals, are for your reference only. For actual applications, please contact our valve sales engineers to obtain the support you need for free. Thank you!