Pneumatic diaphragm actuator Model 20
Installation, Operation and Maintenance Instructions
Unpacking
The Narvik pneumatic diaphragm actuators are mostly delivered in combination with
Desuperheaters for use on low-, medium- and high pressure steam applications and packed with
the greatest care in wooden boxes or cartons for protection during handling and transit to site. If it
is found, however, that damage has occurred during shipment, then this should be reported
immediately to your forwarder or Narvik representative.
Particular care should be taking when removing the pneumatic diaphragm actuators (including
Desuperheaters) from the packing and your special attention is required to check carefully that no
damage has occurred to the actuators, accessories as: pneumatic positioner, electric/pneumatic
positioner, position transmitter, air filter regulator, booster relay, lock-in relay, limit switches,
solenoid valves and the standard piping with Stainless Steel pipe and fittings.
Warning: the hoisting lug is for the actuator only, NOT for a total assembly!
Table 1 - Functional specifications
Type
20 - 50 (see fig. 1)
20 - 90 (see fig. 3)
Type
Action
Diaphragm
Volume
Max. thrust
Spring range
Travel
Travel speed
direct acting
stem extends with air pressure
700 cm2
10300 cm3
11 kN (48.800 Lbf)
1,0 to 3,8 bar (15 to 55 psi)
55 mm (2 1/8")
depending on spring range, air supply
pressure, piping arrangement and air
capacity of auxiliary devices
integrated pointer and Stainless
Steel travel scale
1/2" NPT female
6,0 bar (max. 87 psi)
-40°C to +70°C (-40°F to +158°F)
46,0 kg (102 Lbs)
side mounted (see fig. 2)
19,0 kg (42 Lbs)
direct acting
stem extends with air pressure
700 cm2
12500 cm3
10 kN (44.400 Lbf)
1,0 to 2,2 bar (15 to 32 psi)
90 mm (3 1/2")
depending on spring range, air supply
pressure, piping arrangement and air
capacity of auxiliary devices
integrated pointer and Stainless Steel
travel scale
1/2" NPT female
6,0 bar (max. 87 psi)
-40°C to +70°C (-40°F to +158°F)
68,0 kg (150 Lbs)
side mounted (see fig. 4)
19,0 kg (42 Lbs)
Travel indicator
Air connection
Air supply
Ambient temperature
Weight
Handwheel
Weight
20 - 50
20 - 50
20 - 90
20 - 90
Fig. 1
Fig. 2
Fig. 3
Fig. 4
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NRVSB-0058-EN-1005
Pneumatic diaphragm actuator Model 20
Installation, Operation and Maintenance Instructions
Assembly of a ‘Narvik’ standard duty A.T.-Temp Desuperheater
Air filter regulator
E/P-postioner
Water
Steam
Fig. 5
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page 2
Pneumatic diaphragm actuator Model 20
Installation, Operation and Maintenance Instructions
Principle of operation
In a direct acting diaphragm actuator, increasing loading pressure moves the actuator stem
downward, compressing the spring. When the loading pressure is decreased, the spring moves the
actuator stem upward.
In the event of failure of the loading pressure or the operating medium pressure to the controller,
the actuator stem moves to the upward position.
Warning: Be certain that the diaphragm casing pressure does not exceed the limits listed in the
specification table (see Table 1).
Actuator/Desuperheater disassembly (see fig. 6)
Before any maintenance operation on the Narvik Desuperheater fitted with a Narvik actuator model
20 - 50, please carefully follow these instructions:
• Isolate or bypass the steam supply.
• Check steam line is cooled down and pressure free.
• Shut-off Desuperheater water supply.
1. Cut-off the air supply to the positioner via the air filter regulator. Disconnect the pneumatic
connections and the electrical connections of the positioner on the network. Disassemble on the
actuator side the pneumatic connections to the positioner.
2. Disconnect the lever of the positioner from the stem coupling (mechanical linkage).
3. Slightly supply the actuator to lift the Desuperheater piston from the seat. Disassemble the upper
and lower couplings (27) (see fig. 6) through the screws. Cut-off the air on the diaphragm casing.
4. Unscrew the ‘FAG’ nut (see Installation, Operation and Maintenance Manual of the A.T.-Temp
Desuperheater) and lift the entire actuator from the Desuperheater.
Disassembly
This operation is only needed for:
• To change the diaphragm.
• To change one or several springs.
Diaphragm exchange, model 20 - 50
• Cut-off the air supply to the positioner via the air filter regulator. Disconnect the pneumatic
connections and the electrical connections of the positioner on the network. Disassemble on the
actuator side the pneumatic connections to the positioner.
• Remove all short bolts (18), rings (21) and nuts (20) on the bolt circle. Progressively unscrew the 4
long bolts (19), located on a quadrangle on the circle, to unload the springs. After having released
the 4 bolts, take the upper casing (1) away.
• Unscrew plate bolt (3) whilst avoiding the actuator stem (10) rotation by using the square located
on the half upper coupling (27). Take diaphragm plate (4) away. Withdraw diaphragm (5) and
replace it by a new one. Tighten diaphragm plate.
• Reassemble the upper casing by using the 4 bolts (19), load the springs until complete tightening
of the diaphragm and complete the short bolts circle in a clockwise, criss-cross pattern with a
max. torque of 20 Nm.
Exchange of one or more springs
• Same instructions as for diaphragm exchange, except spring plate (6) has to be taken away.
• Change damaged springs (7)(8) and reassemble in the opposite way.
Table 2 - Spare parts
Item
Quantity
Name
Part No.
3
5
19
7/8
1
1
4
5
5
1
Plate bolt M14 x 100 mm
Diaphragm ø 420
Bolts M8 x 100 mm
Spring ø 59, 6 black
Spring ø 59, 6 red
Bushing M35 x 1, 5 mm
P/N - HN. 3283
P/N - 3N. 1299. 20
P/N - HN. 0339. 00
P/N - 4N. 2900. 20
P/N - 4N. 3416. 20
P/N - 4N. 2764. 20
13
Make sure that the identification number (indicated on the nameplate) is verified and specified
when ordering spare parts.
Tyco reserves the right to change the contents without notice
page 3
Pneumatic diaphragm actuator Model 20 - 50
Installation, Operation and Maintenance Instructions
Model : 20 - 50
Fig. 6
Ø420
Ø360
16
6
17
2
3
4
5
95
1
21
20
25
7/8
95
18
12
15
95
22
27
400
19
23
13
24
10
26
Table 3 - Standard materials
Note
Item
Quantity
Name
Material
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
1
1
1
1
1
1
5
5
1
1
1
1
1
1
36
4
40
40
1
1
2
1
2
1
Upper casing
Limit block
Bolt
Diaphragm plate
Diaphragm
Spring plate
Spring right
Spring left
Stem
Lower housing
Bushing
Yoke plate actuator
1/2” NPT socket
Hoisting lug
Bolt
Bolt
Nut
Washer
Cushioning plate
Support plate
Connector air snubber
Washer
Air snubber
Coupling
C - Steel
C - Steel
12.9
C - Steel
Rubber
Al
Dimension
Dimensions may be subject to change without
prior notification. Narvik will provide a certified
dimensional drawing upon request.
M14 x 100
● Recommended spares
Ø 420
Ø 59.6
Ø 59.6
A 182 F316
C - Steel
Brass
A 105 /C22.8
A 105 /C22.8
A2
8.8
8.8
Steel
8.8
Rubber
SS
8.8
Brass
Part of DSH
Tyco reserves the right to change the contents without notice
M35 x 1.5
M8 x 30
M8 x 100
M8
M8
M14
page 4
Pneumatic diaphragm actuator Model 20
Installation, Operation and Maintenance Instructions
Actuator/Desuperheater disassembly (see fig. 7)
Before any maintenance operation on the Narvik Desuperheater fitted with a Narvik actuator model
20 - 90, please carefully follow these instructions:
• Isolate or bypass the steam supply.
• Check steam line is cooled down and pressure free.
• Shut-off Desuperheater water supply.
1. Cut-off the air supply to the positioner via the air filter regulator. Disconnect the pneumatic
connections and the electrical connections of the positioner on the network. Disassemble on the
actuator side the pneumatic connections to the positioner.
2. Disconnect the lever of the positioner from the stem coupling (mechanical linkage).
3. Slightly supply the actuator to lift the Desuperheater piston from the seat. Disassemble the upper
and lower couplings (27) (see fig. 7) through the screws. Cut-off the air on the diaphragm casing.
4. Unscrew the ‘FAG’ nut (see Installation, Operation and Maintenance Manual of the A.T.-Temp
Desuperheater) and lift the entire actuator from the Desuperheater.
Disassembly
This operation is only needed for:
• To change the diaphragm.
• To change one or several springs.
Diaphragm exchange, model 20 - 90
• Cut-off the air supply to the positioner via the air filter regulator. Disconnect the pneumatic
connections and the electrical connections of the positioner on the network. Disassemble on the
actuator side the pneumatic connections to the positioner.
• Remove all short bolts (18), rings (21) and nuts (20) on the bolt circle. Unscrew progressively the
4 long stud bolts (19), located on a quadrangle on the circle, to unload the springs. After having
released the 4 stud bolts, take the upper casing (1) away.
• Unscrew plate bolt (3) whilst avoiding the actuator stem (10) rotation by using the square located
on the half upper coupling (27). Take diaphragm plate (4) away. Withdraw diaphragm (5) and
replace it by a new one. Tighten diaphragm plate.
• Reassemble the upper casing by using the 4 stud bolts (19), load the springs until complete
tightening of the diaphragm and complete the short bolts circle in a clockwise, criss-cross
pattern with a max. torque of 20 Nm.
Exchange of one or more springs
• Same instructions as for diaphragm exchange, except spring plate (6) has to be taken away.
• Change damaged springs (7)(8) and reassemble in the opposite way.
Table 4 - Spare parts
Item
Quantity
Name
Part No.
3
5
19
7
8
13
1
1
4
3
3
1
Plate bolt M14 x 100 mm
Diaphragm ø 420
Stud bolt M8 x 100 mm with nut
Spring ø 91, 0 black
Spring ø 127, 0 black
Bushing M35 x 1, 5 mm
P/N - HN. 3283
P/N - 3N. 1299. 20
P/N - HN. 1858. 00
P/N - 4N. 3017. 20
P/N - 4N. 3016. 20
P/N - 4N. 2764. 20
Make sure that the identification number (indicated on the nameplate) is verified and specified
when ordering spare parts.
Safety manual operator
Version: Side-mounted (see further on).
Tyco reserves the right to change the contents without notice
page 5
Pneumatic diaphragm actuator Model 20 - 90
Installation, Operation and Maintenance Instructions
Ø420
Model : 20 - 90
Fig. 7
Ø360
6
17
2
3
5
4
1
95
16
18
21
25
20
19
8
225
7
12
11
15
24
44
23
22
13
26
400
10
27
Table 5 - Standard materials
Note
Item
Quantity
Name
Material
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
1
1
1
1
1
1
3
3
--1
1
1
1
--1
1
1
36
4
40
40
1
1
2
1
2
1
Upper casing
Limit block
Bolt
Diaphragm plate
Diaphragm
Spring plate
Spring inside
Spring outside
--Stem
Stroke limiter
Lower housing
Bushing
--Yoke plate actuator
1/2” NPT socket
Hoisting lug
Bolt
Bolt
Nut
Washer
Cushioning plate
Support plate
Connector air snubber
Washer
Air snubber
Coupling
C-Steel
C-Steel
12.9
C-Steel
Rubber
Al
Dimension
Dimensions may be subject to change without
prior notification. Narvik will provide a certified
dimensional drawing upon request.
M14x100
● Recommended spares
Ø 420
Ø 91
Ø 127
--A 182 F316
A 106 Gr. B/ST.35.8
C-Steel
Brass
--A 105/C22.8
A 105/C22.8
A2
8.8
8.8
Steel
8.8
Rubber
Al
SS
8.8
Brass
Part of DSH
Tyco reserves the right to change the contents without notice
M35x1.5
M8x30
M8x100
M8
M8
M14
page 6
Pneumatic diaphragm actuator Model 20
Installation, Operation and Maintenance Instructions
Fig. 8 - Side-mounted handwheel
••
•
•
18
21
19
•
25
23
150
•
05
•
104
20
•
•
24
• •
10
•
02
03
22
•
•
•
•
17
13
•
•
•
14
15
•
•
07
11
•
•
•
280
09
11
16
08
12
•
04
ø 200
01
23
•
Note
● Recommended spares
06
•
Item
Qty. Name
Material
Dimension
14
15
16
17
18*
19
20*
21
22
23
24*
25
1
1
1
1
1
1
2
2
1
1
1
2
C 45
Steel
PTFE
Nylon
St 37.2
5 x 5 x 20 mm
Table 6: Standard materials
Item
Qty. Name
1*
1
Mounting plate (upper)
2*
1
Mounting plate (lower)
3*
1
Mounting plate (handwheel)
4
1
Drive shaft
5
1
Shaft left
6
1
Shaft right
7*
1
Helical gear
8*
1
Parallel key
9*
1
Pinion
10
1
Cover
11*
8
Bolt
12*
1
Bushing (handwheel)
13*
1
Spindle (handwheel)
* Zinc plated parts
Material
Dimension
SA 105
SA 105
St 37 K
Al. Bronze
1.4057
1.4057
C-Steel
C 45
C-Steel
St. Steel
10.9
SA 105
SA 105
8 x 7 x 24 mm
M12 x 40 mm
Parallel key
Circlip
Plain bearing
Bearing bushing
Eye Bolt
Lock with keys
Pillar
Screw
Nameplate
Handwheel
Gear bushing
Ring
Tyco reserves the right to change the contents without notice
SA 105
St. Steel
St. Steel
Aluminium
SA 106 Gr. B
St. Steel
M5 x 10 mm
M5
page 7
Pneumatic diaphragm actuator Model 20
Installation, Operation and Maintenance Instructions
Maintenance
Maintenance of the Narvik actuator is straight forward and does not require any special tools or
training.
Care should be taken during any maintenance operation, particularly when working with grinders,
compressed air and rotating machinery. It is imperative that safety glasses and protective workwear
are used in accordance with standard safety procedures. In case of doubt, consult your supervisor
or safety officer before commencing any work on the equipment.
Manual operator
•
•
•
•
The Narvik manual operator is side-mounted between the actuator and the Desuperheater.
The manual operator is intended to be used for emergency only.
The handwheel (23) is locked by means of a lever (19).
The handwheel will not turn during actuated operation of the actuator assembly and/or
Desuperheater assembly.
• By unlocking the lever, clockwise turning the handwheel will move the 2 spindle parts (5)(6)
away from each other, opening the valve.
• Turning counter clockwise, the valve will close.
After using the manual operator, the system shall be set back to the original position. Failing to do
so may lead to improper valve response and/or damaging of the piston/spray cylinder.
Note:
- Apply some general purpose grease on the gear wheel (7)(9) once a year.
- Make sure no dirt is trapped between the drive shaft (4) and the wheel large (7).
- This may obstruct free movement between these parts.
Storage procedure
Upon receipt, check both the pneumatic actuator and the packing case for any transit damage. Any
damage to the pneumatic actuator should be reported immediately to Narvik or their local agent.
Any damage to the packing container should be rectified to prevent the ingress of dust or water,
prior to placing the equipment into storage. Check the information contained on the identification
plate (tagplate) and documentation and return the unit to its packing with protective covers in place
(see Fig. 5).
For short term storage, up to 6 months duration, no additional preservation measures are
necessary. Retain the unit in its original packing in a clean, dry indoor location. If outdoor storage is
unavoidable, then the packing case should be enclosed in a waterproof covering.
For long term storage use a dry indoor location only. Retain pneumatic actuator in its original
packing and inspect at 3 monthly intervals to ensure that no deterioration has occurred.
Before placing the pneumatic actuator into service, inspect all components, to ensure correct
functioning. Follow the procedure for installation as detailed in the operating and maintenance
instruction manual.
Warning
The hoisting lug is for the actuator only, NOT for a total assembly !
Note
Materials and data of units supplied, may deviated from this Instruction Manual. Please consult
order documents in case of doubt.
The pneumatic actuator is classified under European Directive 97/23/EC under category I with CEmarking.
Tyco reserves the right to change the contents without notice
page 8