The HXF-1 two-nozzle flame arrestor breather valve is a two-way breather valve installed on the top of fixed roof tanks, featuring two external piping connections (two nozzles) and integrating pressure relief, vacuum intake, and flame arrestor functions. When the tank pressure exceeds the set value, the pressure disc opens to discharge volatile gases through the flame arrestor and one nozzle to a recovery or treatment system; when vacuum occurs inside the tank, the vacuum disc opens to introduce protective gas (e.g., nitrogen) or air through the other nozzle to maintain pressure balance. This valve is primarily used for tank blanketing and centralized venting systems. Its core purpose is to achieve controlled排放 of tank breather vapors and safe gas intake, while the built-in flame arrestor prevents external flame ingress, meeting environmental, safety, and explosion-proof code requirements.

HX and HXF-1 dual-nozzle breathing valve product diagram

1. Two-nozzle design: Two independent connections for vent gas discharge and intake gas supply, facilitating connection to external recovery and blanketing systems.

2. Two-way breathing function: Pressure disc and vacuum disc operate independently, providing both overpressure relief and vacuum intake protection.

3. Built-in flame arrestor: Stainless steel corrugated plate flame arrestor core effectively blocks external flame propagation, meeting petrochemical tank fire protection standards.

4. Set-pressure operation with reliable sealing: Flat or tapered hard seal ensures stable opening pressure and zero leakage when closed.

5. All-weather protection structure: Rain and dust cover with internal drainage prevents water accumulation, suitable for harsh outdoor environments.

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

7. Large ventilation capacity with low pressure drop: Optimized flow path provides low breathing resistance for both venting and gas intake during rapid tank filling or discharging.

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

HX1 type breathing valve DN50-400 =-350       HXF1 type flame-retardant breathing valve DN50-400

Drawing of Parts

Performance Specification Table

HX1 type breathing valve DN50-400 =-350       HXF1 type flame-retardant breathing valve DN50-400  

Outline dimension table