HX-4 and HXF-4 models are equipped with double-tube (fire-resistant) breathing valves. is a one-way pressure-relief breather valve installed on the top of fixed roof tanks, integrating set-pressure relief and flame arrestor function with an external piping connection. When the tank pressure rises to the set opening pressure, the disc automatically opens to safely release excess gas through the flame arrestor layer to an external pipeline; when the pressure falls below the set value, the valve remains tightly closed, preventing external air or flame from entering. This valve is primarily used for controlled venting and safety protection of flammable, explosive, and toxic media (such as benzene, alcohols, oil vapors, etc.) in storage tanks. Its core purpose is to direct tank vapors through the connected piping to a recovery or treatment system while preventing external flame ingress, meeting both environmental emission and fire/explosion protection requirements.

HX-4 and HXF-4 flame arrester breathing valves with dual connection pipes product diagram

1. One-way directional venting: Allows only one-way relief when tank pressure exceeds the set point, equipped with flange or threaded nozzle for directing vented gas to a collection line or flare system.

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

3. Set-pressure operation with reliable sealing: Flat or tapered hard seal (soft seal optional) ensures stable opening pressure and zero leakage when closed.

4. Nozzle connection for easy installation: Standard flange or threaded outlet for quick connection to external piping, facilitating system integration.

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; disc and flame arrestor core in stainless steel for various corrosive media.

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

8. Large ventilation capacity with low pressure drop: Optimized flow path provides low breathing resistance to meet tank exhaust demands during rapid filling or discharging.

Structural diagram of HX-4 and HXF-4 breathing valves with dual connection pipes

Drawing of Parts

Performance Specification Table

HX4 type breather valve with exhalation connection pipe DN50-250 HXF4 type flame arrester breather valve with exhalation connection pipe DN50-250

Outline dimension table