00136629_0
Gas-tight shut-off damper, variant NAK-P

Gas-tight shut-off damper with pneumatic actuator

00132260_0
Hand wheel


00132257_0
Electric actuator


00132253_0
Pneumatic actuator


00136629_0
00132260_0
00132257_0
00132253_0

NAK 

FOR THE GAS-TIGHT SHUT-OFF OF DUCTS 

Fulfils the level of 'leak tightness' required by KTA Guideline 3601 (German Nuclear Safety Standards Commission, KTA) and by DIN 25496 even when the power supply or compressed air supply fails

  • Compact construction and robust actuator mechanism allow for any installation orientation
  • Maximum leakage air flow of closed damper 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 toggle lever principle
  • Variants with hand wheel, pneumatic actuator or electric actuator
  • Brass 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~ 400 V AC, 50 Hz or 1~ 230 V AC, 50 Hz


General information

Application

  • For shutting off air ducts in ventilation and air conditioning systems with the highest safety-related requirements for low leakage of the shut-off (gas-tight)
  • Fulfils the level of 'leak tightness' required by KTA Guideline 3601 (German Nuclear Safety Standards Commission, KTA) and by DIN 25496 even when the power supply or compressed air supply fails


Special characteristics

  • Compact construction and robust actuator mechanism allow for any installation orientation
  • With a special drive mechanism, the so-called toggle lever principle: this means that the closed shut-off damper fulfils the required tightness, even if the closing energy fails
  • Maximum leakage air flow of closed damper 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


Nominal sizes

  • B: 400, 600, 800, 1000 mm (intermediate sizes: 401 – 999 mm, in increments of 1 mm)
  • H: 270, 510, 755, 1000 mm
  • Any combination of B × H possible


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 (3~ 400 V AC, 50 Hz)
  • NAK-E1: gas-tight shut-off damper with electric actuator (1~ 230 V AC, 50 Hz)


Constructions

  • Duct connection unperforated
  • 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 dynamics with 2 pivot points and deflection elements (toggle lever principle)
  • 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


Material and surfaces

  • Casing made of galvanised sheet steel with RAL 7001 powder-coating
  • Blades and sealing frame made of galvanised sheet steel with RAL 7001 powder coating
  • Drive linkage, travel stops and further attachments made of galvanised steel
  • Brass bearings
  • Shafts made of stainless steel 1.4301
  • Seals made of neoprene rubber foam, temperature resistant up to 80 °C


Standards and guidelines

  • Leakage air flow of closed shut-off blade according to KTA 3601 Guideline (German Nuclear Safety Standards Commission, KTA) and DIN 25496
  • Casing air leakage to EN 1751, class C


Maintenance

  • Contamination should be removed as it may lead to corrosion
  • Lubricate friction points and bearings
  • NAK-H, NAK-E, NAK-E1: Lubricate threaded spindle
  • Lubricating intervals depend on the application: every six to twelve months or after a maximum of 2000 switching cycles
  • Use only oil or grease that is free of resins or acids.

Technical information

  • FUNCTION
  • TECHNICAL DATA
  • QUICK SIZING
  • SPECIFICATION TEXT
  • ORDER CODE
Schematic illustration of NAK-H
00133404_0
① Casing
② Blade
③ Rotary knob
④ Linkage (over centre locking)
⑤ Seal


00133404_0
00133764_0
00133759_0



Nominal sizes

400 × 270 – 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

Operating temperature

80 °C

NAK-E

Supply voltage

3~ 400 V AC, 50 Hz

Nominal current

0.7 A

Current at maximum torque

1.0 A

Switch-on current

3.0 A

Torque

60 Nm

Actuator speed

22 1/min

Motor rating

0,12 kW (S2: 15 min)

Heating

1~ 230 V AC, 50 Hz

Runtime required to fully close or fully open the damper

Approx. 60 s

Protection level actuator

IP 68

EC conformity

EMC to 2004/108/EU, low voltage to 2006/95/EU

Operating temperature

-25 to 80 °C

Weight

20 kg


NAK-E1

Supply voltage

1~ 230 V AC, 50 Hz

Nominal current

1.8 A

Current at maximum torque

2.7 A

Switch-on current

7.5 A

Torque

60 Nm

Actuator speed

22 1/min

Motor rating

0,12 kW (S2: 15 min)

Heating

1~ 230 V AC, 50 Hz

Runtime required to fully close or fully open the damper

Approx. 60 s

Protection level actuator

IP 68

EC conformity

EMC to 2004/108/EU, low voltage to 2006/95/EU

Operating temperature

-25 to 80 °C

Weight

25 kg


NAK-P

Function

Pneumatic, double acting

Operating pressure

6 bar

Runtime required to fully close or fully open the damper

At least 2 s

Air consumption

4.4 nl/stroke

Compressed air

Filtered

Weight

5 kg


NAK: free cross section [m2]

H

B

400

600

800

1000

270

0.06

0.096

0.13

0.16

510

0.12

0.19

0.26

0.33

755

0.18

0.29

0.39

0.5

1000

0.24

0.38

0.52

0.66

Differential pressure

v Δpst
m/s Pa

2

4

4

10

6

30

8

60

10

70


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–P–
G–
R/800 × 755/Z05
||||||
123456

1 Type 
NAK Shut-off damper, gas-tight

2 Function
H Hand wheel
P Pneumatic actuator
E Electric actuator 400 V AC, 50 Hz, 3-phase
E1 Electric actuator 230 V AC, 50 Hz, 1-phase

3 Construction
No entry: duct connection without flange holes
G Duct connection with flange holes

4 Operating side
R right
L left

5 Nominal size [mm]
Specify size width × height

6 Attachments
No entry: without attachment
Z01 1 limit switch for damper blade position CLOSED
Z02 1 limit switch for damper blade position OPEN
Z03 2 limit switches for damper blade positions OPEN and

CLOSED
With pneumatic actuator (function P)
Z04 1 solenoid valve
Z05 1 solenoid valve and 1 limit switch for damper blade position

CLOSED
Z06 1 solenoid valve and 1 limit switch for damper blade position

OPEN
Z07 1 solenoid valve and 2 limit switches for damper blade positions OPEN and CLOSED


Order example: NAK–E–G–R/800×755/Z05
TypeNAK
FunctionPneumatic actuator
VariantDuct connection with flange holes
Operating sideright
Nominal size [mm]Width 800, height 755
Attachments1 solenoid valve and 1 limit switch for damper blade position CLOSED


Downloads

product information

  • Product data sheet Type NAK

    NAK_PD_2024_10_01_DE_en Product data sheet 960 KB pdf

certificates

  • Declaration of Incorporation NAK

    CE_2016_11_NAK_GB_en Certificate 620 KB pdf

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