Double Flap Damper for Power Plants

UGES Double Flap Dampers provide gas-tight isolation and gravity material flow control in thermal power plant ash handling and flue gas systems. The dual-flap design ensures reliable shutoff under high-pressure differentials, protecting downstream equipment during boiler trips, ash hopper discharge, and precipitator maintenance cycles.

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Double Flap Damper Key Specifications

Blade Material

AR400 / Hardox 450 abrasion-resistant steel for fly ash and bottom ash service

Temperature Rating

Up to 400°C for flue gas isolation; 200°C for ash hopper discharge duty

Actuation Type

Pneumatic cylinder-operated with solenoid control and manual emergency override

Size Range

300 mm × 300 mm to 1500 mm × 1500 mm for hopper outlets and duct branches

Sealing

Dual metal-to-metal flap seal with intermediate air purge for zero leakage at ±600 mmWG

Cycle Life

Rated for 1,000,000+ cycles with self-lubricating bearing assemblies

Industrial Applications

ESP Hopper Ash Discharge
Controls timed gravity discharge of collected fly ash from ESP hoppers into pneumatic conveying lines while maintaining ESP negative pressure.
Bottom Ash Hopper Isolation
Provides gas-tight shutoff at boiler bottom ash hopper outlets during clinker removal, preventing hot air ingress into the ash handling system.
Flue Gas Duct Emergency Isolation
Isolates boiler flue gas ducts during emergency trips or maintenance, preventing backflow through induced-draft fan systems.

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