The HX/HXF-1 two-way dual-nozzle breather valve is a two-way breather valve installed on the top of fixed roof tanks, featuring two independent external piping connections (dual nozzles) for vent gas discharge and intake gas supply respectively, integrating pressure relief, vacuum intake, and flame arrestor functions. When the tank pressure exceeds the set value, the pressure disc opens to discharge volatile vapors 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 blanketing gas (e.g., nitrogen) or air through the other nozzle to maintain pressure balance. Its core purpose is to achieve controlled emission 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 bidirectional dual-nozzle breather valve product diagram

1. Dual-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

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!