Type NAK

For the gas-tight shut-off of ducts

 

Gas-tight shut-off dampers are designed to 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.

  • Compact design and robust actuator mechanism allow for any installation orientation
  • Maximum air leakage rate is 0.0028 (l/s)/m² or 0.01 (m³/h)/m² at a 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 switches
  • Double acting pneumatic actuator, with optional solenoid valve
  • Electric actuator 3 × 230 V AC (400 V AC) or 230 V AC
small_tab1_Serie NAK
  • Application
  • Description

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

Special characteristics

  • 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

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

Attachments

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

Construction features

  • Casing made of welded U-channel sections, material thickness 3 mm
  • Blades and special sealing frame, material thickness 2 mm
  • External blade mechanism (over centre locking)
  • OPEN blades rest against the travel stops
  • CLOSED blades are pressed against the seal
  • Special sealing frame fitted with glued-in seals, welded into the casing

Materials and surfaces

  • Casing made of sheet steel, material no. EN 10142-DX51D+Z150-200
  • Blades and sealing frame made of sheet steel, material no. EN 10327-DX51D+Z150-200-NAC
  • Linkage, travel stops and further attachments made of galvanised steel
  • Brass or stainless steel bearings
  • Seals made of neoprene rubber foam, temperature resistant up to 80 °C
  • Powder-coated casing and blades, grey (RAL 7001)

Technical information

  • Function
  • Technical data
  • Specification text
  • Order code

Functional description

The shut-off damper is opened and closed manually, by turning a hand wheel. Turning the hand wheel approx. 30 times moves the blades into the corresponding end position. Turning the hand wheel clockwise closes the damper.

Functional description

The shut-off damper is opened and closed with an electric actuator.

The control input signal is provided by others.

In case of a power failure the shut-off damper can be opened or closed manually by turning the hand wheel.

Functional description

The shut-off damper is opened and closed with a double acting pneumatic actuator.

The easiest way to generate the control input signal is electrically, using solenoid valves.

Different opening and closing times can be set using throttle valves.

The running time is at least 2 seconds.

nak

 

Rectangular shut-off dampers for shutting off ducts (gas-tight).

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.

Ready-to-operate unit which consists of the casing, blades and the blade mechanism (over centre locking).

Flanges on both sides, suitable for duct connection.

Suitable for duct pressures up to 5000 Pa.

Special characteristics

  • 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

Materials and surfaces

  • Casing made of sheet steel, material no. EN 10142-DX51D+Z150-200
  • Blades and sealing frame made of sheet steel, material no. EN 10327-DX51D+Z150-200-NAC
  • Linkage, travel stops and further attachments made of galvanised steel
  • Brass or stainless steel bearings
  • Seals made of neoprene rubber foam, temperature resistant up to 80 °C
  • Powder-coated casing and blades, grey (RAL 7001)

Construction

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

Technical data

  • Nominal sizes: 400 × 270 to 1000 × 1000 mm
  • Maximum differential pressure: 5000 Pa, in closing direction
  • Closed blade air leakage: < 0.0028 (l/s)/m² or 0.01 (m³/h)/m²
nak

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For general question regarding products or services you can also call:
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