Multi Louvre Dampers
| PARAMETER | DETAILS |
|---|---|
| SIZE RANGE | As per application* |
| PRESSURE RATING | Upto 2000 mm Water Column* |
| TEMPERATURE RANGE | Upto 650 °C |
* Higher Sizes / Pressure available on request
Multi Louvre Dampers
Dampers and louvers control the flow of air in a process system or enclosed area. Dampers are usually actuated or manually adjustable for flow control. They can modulate gas or air flow, divert flow into alternative systems, or isolate a process for inspection and repair.
Louver Dampers are a type of damper consisting of several blades mounted parallel across a duct. They are lightweight and compact, offering low leakage to the outside environment. However, long thin blades may promote flutter, sealing issues in dirty applications, and higher pressure drop due to flow obstruction. Louvers are often fixed for a constant flow rate.
Fouress Multi Louvre Dampers are designed to provide a guaranteed sealing efficiency of 99.9% or better across the cross-sectional area. They incorporate flexible metallic sealing systems made of austenitic stainless steel or high nickel alloys. Double row seals can also be provided to ensure 100% leak tightness with purge air.
Units can be supplied for both circular and rectangular ducts of all sizes for temperatures and differential pressures up to and exceeding 650°C and 2000 mm H₂O respectively.
These highly engineered dampers are designed to withstand rated plant production loads while operating efficiently under partial load conditions. Designs are developed based on critical operational parameters such as Gas Pressure, Gas Temperature, and regulation requirements.
Applications
- Power Plants
- Refineries
- Cement Plants
- Steel Plants
Multi Louvre Dampers – Features
- Designed to provide sealing efficiency of 99.9% or better on cross-sectional area with single row of seal and 100% with double row seal using external purge air.
- Incorporates flexible metallic leaf spring type sealing systems made of austenitic stainless steel or high nickel alloys.
- Available for square, rectangular, or circular cross-section ducts.
- Designed to withstand flue gases up to 650°C temperature and 2000 mm WC pressure.
- Suitable for installation in horizontal or vertical ducts.
- Equipped with high temperature self-aligning gunmetal outboard bearings accessible from outside for maintenance.
- Can be supplied with parallel or opposed action blades.
- Available with loss motion linkage — a special sliding linkage connecting the shafts to nullify differential expansion between frame and blade.
- Operation options include Electric, Pneumatic, Hydraulic, or Manual.
- Entire operating gear is located outside the duct and does not come in contact with flue gases.
- Critical components such as actuators, gearboxes, bearings, and linkages are accessible for inspection and servicing from outside at all times.
Multi Louvre Dampers – Design Specifications
| PARAMETER | DESCRIPTION | DETAILS |
|---|---|---|
| SIZE RANGE | As per Application* | |
| PRESSURE RATING | Upto 2000 mm Water Column* | |
| TEMPERATURE RANGE | Upto 650°C | |
| APPLICATION | ON-OFF / CONTROL | |
| MATERIAL OF CONSTRUCTION | FRAME | MS IS2062 up to 350°C. Above this, frame shall be either internally refractory lined or higher metallurgy. |
| BLADE | MS IS2062 up to 350°C; BQ MS IS2002 or ASTM A516 Gr.70 from 351°C to 425°C; SS 304 from 426°C to 550°C; SS 316 / SS 321 from 551°C to 650°C. | |
| SHAFT | EN8 up to 350°C; SS410 from 351°C to 425°C; SS 304 from 426°C to 550°C; SS 316 / SS 321 from 551°C to 650°C. | |
| SEAL TYPE | Leaf spring type sealing system made of SS 316 or Inconel 625. | |
| BEARING | High Temperature Gunmetal | |
| DESIGN GOVERNING STANDARD & TESTING | Fouress Standards / AMCA Standard | |
| MODE OF OPERATION | Manual / Electrical / Pneumatic / Hydraulic Actuation | |
| NO OF DRIVES | Single / Multiple | |
| INSTALLATION ARRANGEMENT | Horizontal / Vertical / Inclined |