The QHXF-89 all-weather anti-freeze flame arrestor breather valve is a safety protection device installed on the top of fixed roof tanks, integrating pressure/vacuum automatic regulation, flame arrestor, and anti-freeze functions. When the tank pressure exceeds the set value, the pressure disc opens to release excess gas; when the tank vacuum reaches the set value, the vacuum disc opens to admit air; the built-in flame arrestor layer effectively blocks external flame ingress; the valve body and internal structure feature an anti-freeze design to prevent ice formation in the condensed water at low temperatures, avoiding disc sticking. Its core purpose is to provide all-weather breathing protection for flammable and explosive media storage tanks in petroleum, chemical and other industries, automatically balancing tank pressure while providing fire and anti-freeze protection, ensuring safe tank operation and environmental compliance in harsh cold climates.

QHXF-89 all-weather breathing valve product diagram

1. Integrated anti-freeze design: The disc guide sleeve and sealing surfaces are made of special anti-freeze materials or equipped with electric tracing interfaces to prevent ice formation and disc failure at low temperatures, suitable for severe cold regions.

2. Fire and explosion-proof flame arrestor layer: Built-in stainless steel corrugated plate flame arrestor core effectively blocks external flame propagation, meeting petrochemical tank fire protection standards.

3. Independent dual disc operation: Pressure disc and vacuum disc operate independently for precise set-pressure relief and set-vacuum intake control.

4. Set-pressure operation with reliable sealing: Disc and seat adopt hard seal or composite soft-hard seal, with stable opening and reseating pressures and zero leakage when closed.

5. All-weather protection structure: Rain and dust cover on top with internal drain slots prevent water accumulation, suitable for various harsh environments.

6. Corrosion-resistant materials: Body available in aluminum alloy, cast steel, or stainless steel; discs and flame arrestor core in stainless steel for corrosive media.

7. Large ventilation capacity with low pressure drop: Optimized flow path ensures low breathing resistance and stable tank pressure during rapid filling or discharging.

8. Easy maintenance: Removable flame arrestor core for cleaning, simple disc assembly disassembly for periodic inspection and maintenance.

Structural diagram of QHXF-89 all-weather breathing valve

Drawing of Parts

Performance Specification Table

Outline drawing of QHXF-89 all-weather breathing valve

Outline dimension table

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!