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Jack & Screw Damper is a type of air damper designed in the form of a vertical or horizontal sliding blade, used to completely open/close the air flow in industrial air ducts. This device is commonly used to isolate gas, smoke, hot steam or dust-containing air flows in systems such as boilers, power plants, dust filtration systems, exhaust gas treatment, cement industry, petrochemical and metallurgy.
Structure and operating principle:
| Parameter | Typical value |
|---|---|
| Configuration | 2 damper levels, insulated spacing |
| Size | DN400 – DN3000 (or as required) |
| Working pressure | From minus 50 mbar to +500 mbar |
| Working temperature | -20°C to +850°C (higher if ceramic/insulation) |
| Body material | Carbon steel, stainless steel 304, 316, Incoloy, heat resistant alloy |
| Damper wing | Welded steel plate, sealed with heat-resistant gasket or metal |
| Control method | Electric, pneumatic, hydraulic, manual |
| Airtight performance | Up to 99.9% (with inert gas/nitrogen between the 2 layers) |
| Leakage-proof level | Class III to Class VI (according to ANSI/FCI) |
