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 and 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

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

Gas-tight shut-off damper with pneumatic actuator

  • 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

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

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)

Standards and guidelines

  • Closed blade air leakage to KTA 3601 Guideline (German Nuclear Safety Standards Commission, KTA) and DIN 25414
  • 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, Related products

  • Function
  • Technical data
  • Quick sizing
  • Specification text
  • Order code

NAK-H

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.

NAK-E

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.

NAK-P

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.

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

Operating temperature

80 °C


NAK-E

Supply voltage

3 × 230 V AC (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

230 V AC

Running time required to fully close or fully open the damper

Approx. 60 s

Protection level of 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

220 – 240 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

230 V AC

Running time required to fully close or fully open the damper

Approx. 60 s

Protection level of 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

Running time 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


Free area – NAK

H B [mm]
H 400 600 800 1000
mm

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

00135485_0

 Type
NAK       Shut-off damper, gas-tight

Function
H       Hand wheel
P       Pneumatic actuator
E       Electric actuator 400 V
E1       Electric actuator 230 V

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

 

Operating side
R       Right side
L       Left side

 Nominal size [mm]
       B × H

 Attachments
       No entry: none
Z01 – Z07

Order example: NAK–E–G–R/600×755/Z03

Function

Electric actuator 3 x 230 V AC

Construction

Duct connection with flange holes

Operating side

Right side

Nominal size

600 × 755 mm

Attachments

Limit switches, indicating blade OPEN and CLOSED


 

Variants, Dimensions and weight, Product details

  • Variants
  • Dimensions and weight
  • Product details

NAK-H

Variant

  • Gas-tight shut-off damper with hand wheel

Parts and characteristics

  • Ready-to-install shut-off damper
  • Blades with linkage (over centre locking)
  • Sealing frame with seal
  • Hand wheel

NAK-E

Variant

  • NAK-E: Gas-tight shut-off damper with electric actuator (3 x 230 (400 V AC), 50 Hz)

Parts and characteristics

  • Ready-to-install shut-off damper
  • Blades with linkage (over centre locking)
  • Sealing frame with seal
  • Electric actuator (3 × 230 (400 V AC), 50 Hz)

NAK-E1

Variant

  • Gas-tight shut-off damper with electric actuator (230 V AC, 50 Hz)

Parts and characteristics

  • Ready-to-install shut-off damper
  • Blades with linkage (over centre locking)
  • Sealing frame with seal
  • Electric actuator 230 V AC

NAK-P

Variant

  • Gas-tight shut-off damper with pneumatic actuator (operating pressure 6 bar)

Parts and characteristics

  • Ready-to-install shut-off damper
  • Blades with linkage (over centre locking)
  • Sealing frame with seal
  • Double acting pneumatic actuator with adjustable throttle valves

NAK-H, weights

H B [mm]
H 400 600 800 1000
mm kg

270

34

45

56

67

510

57

70

82.5

95

755

81

95

109

123

1000

103.5

120

136

153


NAK-E, weights

H B [mm]
H 400 600 800 1000
mm kg

270

57

68

79

90

510

80

93

106

118

755

104

118

132

146

1000

127

143

159

176


NAK-E1, weights

H B [mm]
H 400 600 800 1000
mm kg

270

59

70

81

92

510

82

95

107.5

120

755

106

120

134

148

1000

128.5

145

161

178


NAK-P, weights

H B [mm]
H 400 600 800 1000
mm kg

270

40

51

62

73

510

63

76

89

101

755

87

101

115

129

1000

110

126

142

159


Flange holes – NAK 00146076_0
① Even number of holes (hole pitch = 125 mm)
② Uneven number of holes (hole pitch = 125 mm)


NAK: Width, no. of flange holes

B No. of holes
B n
mm

400 – 524

4

525 – 649

5

650 – 774

6

775 – 899

7

900 – 1000

8


NAK: Height, no. of flange holes

H No. of holes
H n
mm

270

3

510

5

755

7

1000

9


Installation details, Electrical connection

  • Installation details
  • Electrical connection

Installation and commissioning

  • Any installation orientation
  • System pressure must act into the direction of blade closure


NAK-P:

  • Operation requires filtered compressed air, operating pressure 6 bar


NAK-E/NAK-E1:

  • Connect linear and torque switches before commissioning as otherwise the blade mechanism may become damaged
  • Make electrical connections according to wiring diagrams

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For general question regarding products or services you can also call:
Tel.: +49 (0)2845 / 202-0 | Fax: +49 (0)2845/202-265