NAK - Gas Tight Shut Off Dampers

Application

Shut-off dampers of Type NAK for shutting off ducts in air conditioning systems with the most critical safety requirements for tightness (gas- tight). Gas-tight shut-off dampers ensure the level of tightness required by KTA Guideline 3601 (German Nuclear Safety Standards Commission, KTA) and by DIN 25414 even when the power supply or compressed air supply fails.

Key Features

• Compact design and robust actuator mechanism allow for any installation orientation
• Max air leakage rate is 0.0028 (l/s)/m² or 0.01 (m³/h)/m² @ differential pressure of 2000 Pa
• Gas-tight closure, even when there is no power, due to special over centre locking mechanism
• Variants with hand wheel, pneumatic actuator or electric actuator
• Brass or stainless steel bearings
• Powder-coated casing and blades
• Maximum pressure loading of 5000 Pa, in closing direction
• Available in standard sizes and many intermediate sizes

Optional equipment and accessories

• Flange holes
• Limit switch
• Double acting pneumatic actuator, with optional solenoid valve
• Electric actuator 3 × 230 V AC (400 V AC) or 230 V AC

Variants

• NAK-H: Gas-tight shut-off damper with hand wheel
• NAK-P: Gas-tight shut-off damper with pneumatic actuator
• NAK-E: Gas-tight shut-off damper with electric actuator (400 V AC, 50 Hz)
• NAK-E1: Gas-tight shut-off damper with electric actuator (230 V AC, 50 Hz)

Construction

• Duct connection without flange holes
• G: Flange holes on both sides

Nominal sizes

• B: 200, 400, 600, 800,1000 mm (intermediate sizes: 201 – 999 mm,in increments of 1 mm)
• H: 270, 510, 755, 1000 mm
• Any combination of B × H

Attachments

• Attachments: For opening and closing, and for capturing the blade end positions

Special features

• Compact design and robust actuator mechanism allow for any installation orientation
• Gas-tight closure, even when there is no power, due to special over centre locking mechanism
• Maximum closed blade leakage rate is 0.0028 (l/s)/m² or 0.01 (m³/h)/m² at a differential pressure of 2000 Pa
• Maximum pressure loading of 5000 Pa in closing direction