Type ARK

For heavy duty applications

Non-return dampers prevent unwanted airflows against the intended airflow direction when the system is not in operation

Air leakage with back pressure to EN 1751, class 4
Maximum pressure loading of 5000 Pa
Blades made of salt-water resistant AlMg3, casing made of galvanised steel
Available in standard sizes and many intermediate sizes
Variant ARK (with linked blades) for variable volume flows
Variant ARK-1 (with adjustable blade restrictors) for constant volume flows
Installation in horizontal or vertical ducts

Optional equipment and accessories

Installation subframe
Powder coating (RAL, NCS or DB)
Stainless steel construction with stainless steel casing; blades made of AlMg3
Temperature resistant up to 200 °C with Viton seal

Application

Non-return dampers of Type ARK for the fresh air and exhaust air ducts of air conditioning systems
Prevention of unwanted airflows against the intended airflow direction when the system is not in operation
Blades close automatically when the system is shut down
Maximum differential pressure of 5000 Pa

Special characteristics

Blades made of salt-water resistant AlMg3
Robust, maintenance-free construction
Maximum pressure loading of 5000 Pa
Closed blade air leakage with back pressure, in closing direction, to EN 1751, class 4
Damper for negative or positive pressure (air extract or discharge)
Temperature resistant up to 80 °C
Optional temperature resistant construction for up to 200 °C, with Viton seal
Installation in horizontal or vertical ducts
Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel

Variants

ARK: Non-return damper with linked blades, preferably for variable volume flows
ARK-1: Non-return damper with adjustable blade restrictors, preferably for constant volume flows

Construction

Galvanised sheet steel, duct connection without flange holes
A2: Stainless steel
G: Duct connection with flange holes

Accessories

Installation subframe: Installation subframe for the fast and simple installation of mechanically self-powered dampers

Información técnica

Functional description

Non-return dampers open and close automatically.

When the system is in operation, the blades open when air flows. The blade opening angle depends on the differential pressure and the volume flow rate; for variant ARK-1 the opening angle is limited by adjustable blade restrictors.

When the system is shut down, the blades close due to their weight. They safely prevent air from flowing against the intended airflow direction.

Rectangular non-return dampers to prevent air from flowing against the intended airflow direction through fresh air and exhaust air ducts of air conditioning systems.

Ready-to-install component which consists of a casing, blades with low-friction bearings, and travel stop and sealing parts.

Special characteristics

Blades made of salt-water resistant AlMg3
Robust, maintenance-free construction
Maximum pressure loading of 5000 Pa
Closed blade air leakage with back pressure, in closing direction, to EN 1751, class 4
Damper for negative or positive pressure (air extract or discharge)
Temperature resistant up to 80 °C
Optional temperature resistant construction for up to 200 °C, with Viton seal
Installation in horizontal or vertical ducts
Maintenance-free DU bearings with Teflon coating, bearing shafts made of stainless steel

Construction

Galvanised sheet steel, duct connection without flange holes
A2: Stainless steel
G: Duct connection with flange holes

Technical data

Nominal sizes: 200 × 345 to 1200 × 1995 mm
Volume flow rate range: 690 – 23950 l/s or 2484 – 86220 m³/h at 10 m/s
Differential pressure (horizontal airflow): 115 Pa at 10 m/s
Differential pressure (vertical airflow): 45 Pa at 10 m/s

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