1. Multi‑function integration: Combines manhole cover and breather valve into one unit, reducing roof openings and leakage points, simplifying installation and maintenance.
2. Set‑pressure breathing with automatic regulation: Independent pressure and vacuum discs automatically relieve overpressure and admit air under vacuum; pressure settings adjustable as required.
3. Built‑in flame arrestor: Stainless steel corrugated plate flame arrestor core effectively blocks external flame propagation, meeting petrochemical tank fire and explosion codes.
4. Personnel access function: The manhole cover provides a standard‑size opening (e.g., DN500, DN600) for personnel wearing respirators to enter the tank for maintenance.
5. Large flow capacity with low pressure drop: Optimized flow path ensures low breathing resistance for both venting and gas intake during rapid filling or 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: Housing and internals available in aluminum alloy, carbon steel, or stainless steel; disc and flame arrestor core in stainless steel for various corrosive media.
8. Reliable sealing and easy maintenance: Flat or tapered hard seal provides zero leakage when closed; removable flame arrestor core for cleaning; simple disc assembly disassembly.