On a gas conduit system, the assembly between flanges is handled by the Automatic Louver Damper. Louver dampers are made by using different opposed or parallel blades that allow ideal regulation, opening times and good closure. The standard model offered by VALVETEK is designed to operate at around 500 mbar pressures, and the recommended temperature is about 800ºC and speeds of below 30m/s. Closing degree range of 90%-99% of this relatively air tight valve can reach 100% on the introduction of an air sealing system. Designing of the standard Automatic Louver Damper model is done in a manner to maintain a horizontal position of the drive shafts. Although, option for vertical position assembly of the shafts is also possible as per demand.
Standard Louver Damper
Several blades, rotating on the central shaft are fitted on the louver damper. Ends of these blades are joined to the conduits by the help of flanges. The louver damper is basically supplied as an individual part, leaving out the applications in which the unit dimensions need special transport.
Depending on the application, the louvers have two different types of seal design, the options are: swing-thru (closure from 90% to 97%) for surroundings with a density of dust (of below 1000 mg/Nm3); and the closure of 99% for step seat suitable for other applications needing top level of air insulation.
Louvers supplied by VALVETEK have bearings located on the outside and detached from the packing. By following this way, they are kept safe from sources which can cause corrosion and heat, hence enhancing their operational life. This system also enables the packing change without any need to remove the bearing, which leads to easier future maintenance jobs.
Different material can be utilized in the fabrication of the body of the louver dampers. Size range for the standard construction includes 150x1500 mm (min) to 2000x2000 mm (max). Although, larger sizes can be constructed as per request. Reinforcing ribs are used for the construction of blades and are backed by two semi-shafts. Ideally rigid flat disc system withstands the operational pressures caused on these valves and does not cause major losses.
VALVETEK offers its valves ready for 200 mm outer insulation. A space is provided for changing bearings and packings in the future without removing the insulation furnished.