Gravity Explosion Relief Door

Gravity explosion relief door (counterweight hinged type) is a reusable overpressure safety protection device for boiler furnace, flue gas duct, coal pulverizing system and dust collector. When the internal pressure exceeds the preset opening pressure, the door flap will automatically open to release overpressure and explosion shock wave. After pressure drops to safe level, the flap will automatically reset and close by gravity and counterweight. Different from disposable explosion vent panel, this product can be reused after each overpressure relief without replacement.

Suitable Media: Boiler flue gas, hot air, dust-laden gas, pulverized coal-air mixture

Operating Temperature: ≤420°C (standard carbon steel); customizable up to 500°C

Common Materials

Housing, Door Panel: Q235B / Q355B

High-Temperature Corrosion-Resistant Applications: SS304 / SS316L

Seals: High-temperature-resistant flexible graphite / alumina-silica fiber seals

Drive mechanism: Gravity + counterweight hinged; no external actuator

Set opening pressure: Standard range 1.5–3.0 kPa; customization available

Standards: GB/T 16507, ASME B31.1, ISO 13611

Sealing Level: Light sealing (intended for safety pressure relief, not for zero-leakage isolation)

Key Selection Parameters

1. Structural Type: Round / Rectangular

2. Nominal Size

3. Set Opening Pressure

4. Maximum Operating Temperature

5. Medium and Dust Concentration

6. Installation Orientation: Horizontal / Vertical Mounting

7. Environmental Requirements: Insulation / Anti-corrosion Coating

8. Quantity & Site-Specific Requirements

Product Features

✅ Reusable after pressure relief; no replacement required ✅ Simple hinged counterweight structure; high reliability ✅ Wide temperature range; suitable for boilers and pulverized coal systems ✅ Custom sizes and opening pressures available to meet specific project requirements ✅ Low maintenance; no power source required

Technical Support & Customization

All dampers can be customized on size, material, coating, actuation and tightness class. We supply full technical documents: GA drawing, material certificate 3.1, FAT test report, installation manual.

FAQ

Q: What is the difference between isolation damper and volume control damper? 

A: Isolation damper is for shut-off & zero leakage; volume control damper is only for flow regulation, not tight isolation.