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Cleanroom Air Distribution Systems
Bubble-Tight Isolation Damper
A heavy rectangular isolation damper whose solid butterfly blade compresses a mechanically retained perimeter seal under high closing torque.
- Solid Butterfly Isolation Blade
- Mechanically Retained Perimeter Seal
- Double-Gland Axle Packing
- Heavy Flanged Channel Frame
Product Introduction
The bubble-tight isolation damper uses one rigid rectangular butterfly blade inside a heavy flanged channel frame. When the actuator rotates the blade to closed, a continuous silicone seal is compressed against the seat around the complete perimeter. The drive axle passes through a double-gland stuffing box, and outboard bearings keep the blade aligned without placing the bearing races in the air path. Stainless-steel construction and compatible coatings allow the assembly to serve isolation, wash-down and decontamination boundaries.
Key Features
The perimeter seal is mechanically fastened to the blade so it can be inspected and replaced without welding.
Double-gland axle packing restricts leakage around the rotating shaft where it exits the pressure boundary.
External relubricable bearings carry radial load while remaining accessible outside contaminated airflow.
Customer Product Concerns
Bubble-tight service demands uniform perimeter compression, controlled shaft leakage and a frame stiff enough to remain square under differential pressure.
A multiblade damper leaves several blade-to-blade leakage paths at a critical boundary.One solid butterfly blade closes against a continuous seat with no intermediate blade joints.
The axle penetration leaks even though the blade perimeter is fully seated.A double-gland stuffing box seals around the rotating shaft outside the primary blade seal.
High differential pressure deflects a light frame and unloads part of the gasket.Heavy channel construction and a reinforced backing plate maintain seat geometry under closing load.
A damaged perimeter seal requires replacement of the complete blade assembly.Mechanical seal retainers allow the gasket to be removed and renewed as a service component.
Typical Applications
Biocontainment duct isolationPharmaceutical decontamination zonesHigh-integrity laboratory exhaustFilter housing isolation boundariesContaminated process-air shutdown
Technical Parameters
Representative construction data for a heavy-duty rectangular bubble-tight isolation damper are shown below.
| Core Material | Solid 304 or 316 stainless-steel butterfly blade with continuous silicone perimeter seal |
|---|---|
| Panel Thickness | 2.7 mm solid rectangular blade plate |
| Effective Width | 254–1130 mm nominal clear opening width |
| Maximum Length | Up to 1321 mm nominal frame height |
| Steel Facing Thickness | 2.7 mm stainless or coated-steel flanged channel frame |
| Core Density | Approximately 8000 kg/m³ for austenitic stainless-steel blade construction |
| Thermal Conductivity | Approximately 14–16 W/(m·K) for 304 or 316 stainless steel |
| Surface Finish | Mill-finish stainless steel or industrial epoxy coating with silicone blade seal |
| Joint Type | Flanged channel frame with solid butterfly blade, bolted seal retainer and double-gland axle stuffing box |
| Customization | Available based on the intended application and operating environment. |
Available Options
304 or 316 stainless-steel constructionElectric or pneumatic high-torque actuatorOpen-close position switchesIndustrial epoxy or polyester coating
Planning a Bubble-Tight Isolation Damper specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
