The ZFQ explosion‑proof flame arrestor breather valve is a proactive safety device specifically designed for flammable and explosive liquid storage tanks, installed on the roof of fixed roof tanks. It integrates automatic pressure regulation and flame arrestor functions into a single unit: when tank pressure rises above set point or vacuum exceeds allowable limits, the corresponding disc opens promptly to connect the tank with atmosphere or a protective gas source, restoring pressure balance. A built‑in stainless steel corrugated flame arrestor element quenches any potential external flame via narrow‑gap effects, fundamentally preventing fire propagation into the tank. Its core value lies in providing continuous, reliable breathing protection for volatile media storage tanks in petroleum, chemical, terminals, oil depots and similar facilities, while simultaneously meeting environmental emission and explosion‑proof code requirements.

Product Drawing of ZFQ Type Explosion-proof Flame-arresting Breathing Valve

Features:

1. Dual‑function integration – Combines breather valve and flame arrestor in one body, reducing roof penetrations, simplifying installation, and enhancing system reliability.

2. Independent dual‑disc system – Pressure disc and vacuum disc each have their own spring and sealing assembly, actuating precisely at set points without cross‑interference, eliminating misoperation risks.

3. Stable operation and tight sealing – Metal‑to‑metal hard seating ensures zero leakage when closed, with small differential between opening and reseating pressures for responsive action.

4. Superior environmental adaptability – Equipped with rain cover, dust screen, and drain holes to withstand rain, sandstorms, and intense sunlight, suitable for exposed tank farms.

5. Flexible corrosion‑resistant materials – Body options include aluminum alloy, carbon steel, or stainless steel; all internal wetted parts are stainless steel, compatible with oils, aromatics, alcohols, and acid/base media.

6. Low flow resistance – Rounded internal flow passages minimize pressure drop, maintaining stable tank pressure even under high‑rate breathing conditions.

7. Low maintenance – Flame arrestor element can be extracted without tools; disc assembly is quickly detachable for routine inspection and cleaning, requiring no special skills.

8. Full standard compliance – Designed and manufactured per SY/T 0511, ISO 16852, and GB 5908, with rigorous flame‑arresting performance testing prior to delivery.