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Cleanroom Air Distribution Systems
Adjustable Disc Air Valve
A compact circular wall or ceiling valve whose threaded center disc adjusts the annular opening for balancing small supply or extract airflows.
- Continuously Adjustable Annulus
- Compact Circular Face
- Threaded Locking Disc
- Wall or Ceiling Mounting
Product Introduction
The adjustable disc air valve provides a simple terminal for small branch airflows in cleanroom support rooms, toilets and service spaces. Turning the central steel disc changes the annular free area and therefore the pressure drop through the valve; a lock nut secures the selected position after balancing. The formed casing fits a standard round duct sleeve, and spring or bayonet retainers allow the complete valve to be removed for cleaning. Supply versions discharge radially across the wall or ceiling, while extract versions draw air evenly around the perimeter gap.
Key Features
A lock nut holds the balanced setting so routine wiping does not change the annular gap.
The rounded powder-coated face presents a compact cleanable terminal for small rooms.
Standard 100–200 mm spigots connect directly to circular duct sleeves without a separate plenum.
Customer Product Concerns
A small air terminal must provide usable balancing adjustment without a bulky plenum or exposed damper handle.
A fixed circular outlet cannot be balanced after the branch duct is installed.Rotating the center disc changes the annular airway until the measured volume reaches the intended value.
Cleaning staff accidentally change the final air-valve setting.The selected disc position is secured with a hidden spindle lock nut behind the face.
A large grille looks disproportionate in a narrow support-room ceiling.Compact 100–200 mm nominal sizes provide a restrained circular room-side appearance.
The duct sleeve becomes inaccessible behind a fixed valve.Spring or bayonet mounting allows the complete valve body to withdraw for inspection and cleaning.
Typical Applications
Cleanroom support-room extractGowning-room ceiling exhaustJanitor and clean utility roomsSmall laboratory support branchesControlled corridor supply or relief air
Technical Parameters
Typical dimensions and materials for an adjustable supply or extract disc valve are listed below.
| Core Material | Formed sheet-steel valve casing and disc with galvanized threaded spindle, crossbar and lock nut |
|---|---|
| Panel Thickness | 0.8–1.2 mm formed steel valve casing and disc |
| Effective Width | 132–245 mm overall visible face diameter |
| Maximum Length | Up to 245 mm overall face diameter for nominal size 200 |
| Steel Facing Thickness | 0.8–1.2 mm powder-coated steel face |
| Core Density | Approximately 7850 kg/m³ for the steel valve casing and disc |
| Thermal Conductivity | Approximately 45–60 W/(m·K) for the steel valve casing and disc |
| Surface Finish | Smooth white powder coating similar to RAL 9010 with galvanized concealed hardware |
| Joint Type | Spring or bayonet fit to a Ø100–200 mm duct sleeve with threaded adjustable disc |
| Customization | Available based on the intended application and operating environment. |
Available Options
Supply-air radial discharge profileExtract-air valve profileNominal sizes 100, 125, 160 and 200 mmWhite powder coat or stainless-steel finish
Planning a Adjustable Disc Air Valve specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
