The HX8/HXF8 nozzle flame arrestor single intake valve is a one-way vacuum-breaker flame arrestor breather valve installed on the top of fixed roof tanks, featuring an external piping connection (with nozzle) specifically for vacuum intake protection. When the tank vacuum exceeds the set value, the vacuum disc automatically opens to introduce blanketing gas (such as nitrogen) or air through the nozzle, rapidly restoring tank pressure; the valve closes tightly when normal pressure returns. The valve incorporates a built-in stainless steel corrugated plate flame arrestor core to effectively prevent external flame ingress through the intake passage. Its core purpose is to automatically and controllably admit gas during tank discharging, emptying, or sudden temperature drops to prevent tank collapse or deformation, while avoiding direct intake of moist air or contaminants, and achieving centralized gas supply through the nozzle. It is suitable for tank systems requiring prevention of air ingress or equipped with independent pressure relief devices.

HX8 and HXF8 flame arrester single inhalation valves with pipe connection product diagram

1. One-way intake function: Only the vacuum disc operates, automatically opening to admit gas when vacuum exceeds set point, without overpressure relief; suitable for tanks with independent pressure relief devices.

2. Nozzle design: Standard flange or threaded connection for piping to a nitrogen supply or air filter, enabling centralized and controlled gas intake.

3. Built-in flame arrestor: Stainless steel corrugated plate flame arrestor core effectively prevents external flame ingress through the intake passage, meeting petrochemical tank fire protection standards.

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

5. Large intake capacity with low pressure drop: Optimized flow path ensures low intake resistance, meeting instantaneous high-volume gas demand during rapid discharging.

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

7. 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.

8. Easy maintenance: Removable disc assembly; flame arrestor core can be extracted for cleaning; standard nozzle interface facilitates piping connection and periodic maintenance.

Structural diagram of HX8 and HXF8 flame arrester single inhalation valves with pipe connection

零件部位图

Performance Specification Table

Ventilation Capacity Table

Operating Pressure

HX8 type with connecting pipe suction valve DN50-250         HXF8 type with connecting pipe flame retardant suction valve DN50-2

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!