Flap Isolators

Most systems, handling gas, require sections to be isolated for maintenance without shutting down the complete plant, Hitherto, in sophisticated plants, this has been achieved by using gate valves. Fouress flap isolators now offer a simpler and cheaper solutions without any loss in sealing efficiency. In particular they

• require less external space and no special precautions against wind loading,
• can be supplied in modular form, allowing easy installation in large ducts,
• need no external supports when installed in vertical or horizontal ducts.

Typical Applications

Gas turbine Plants

• By-Pass stacks
• Heat Recovery Steam Generators
• Auxiliary Fans
• Cross-Connection Ducts

Oil Refineries

• Drop-out Doors
• Waste Heat Boilers

Nuclear Ventilation Systems

Diesel Engine Plants

Conventional Power Stations

• Air preheater Air and Gas Ducts
• Primary Air Ducts to PF-Mills
• FD, ID and Recirculation Fans
• Auxiliary Boilers

Sealing System Guarantees

Sealing efficiency figures are based on tests at up to 2000 mm H2O & 650OC, similarly FOURESS seals have been in service for over 15 years without any noticeable loss in sealing efficiency.