NAK

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

Gas-tight shut-off damper with pneumatic actuator

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

Schematic illustration of NAK-H

① Casing
② Blade
③ Rotary knob
④ Linkage (over centre locking)
⑤ Seal

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
H	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	Δp_st
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
\|		\|		\|		\|		\|		\|
1		2		3		4		5		6

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

Type	NAK
Function	Pneumatic actuator
Variant	Duct connection with flange holes
Operating side	right
Nominal size [mm]	Width 800, height 755
Attachments	1 solenoid valve and 1 limit switch for damper blade position CLOSED

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