Emerson Yarway Manual

YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
UNPACKING
The Yarway 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 Yarway 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!
VCIOM-03327-EN 16/10
Before installation these instructions must be fully read and understood
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).
www.valves.emerson.com © 2017 Emerson. All rights reserved.

2
20 - 55 20 - 55 20 - 90 20 - 90
YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
TABLE 1 - FUNCTIONAL SPECIFICATIONS
Type 20 - 55 (see fig. 1) 20 - 90 (see fig. 3)
Type Direct acting Direct acting
Action Stem extends with air pressure Stem extends with air pressure
Diaphragm 950 cm2950 cm2
Air displacement 5225 cm38550 cm3
Max. thrust 11 kN (48.800 lbf) 10 kN (44.400 lbf)
Spring range 1.0 to 3.8 bar (15 to 55 psi) 1.0 to 2.2 bar (15 to 32 psi)
Travel 55 mm (2⅛”) 90 mm (3½”)
Travel speed Depending on spring range, air supply
pressure, piping arrangement and air
capacity of auxiliary devices
Depending on spring range, air supply
pressure, piping arrangement and air
capacity of auxiliary devices
Travel indicator Integrated pointer and stainless steel
travel scale
Integrated pointer and stainless steel
travel scale
Air connection ½” NPT female ½” NPT female
Air supply 6.0 bar (max. 87 psi) 6.0 bar (max. 87 psi)
Ambient temperature
(std)*
-29°C to +70°C (-20°F to +158°F) -29°C to +70°C (-20°F to +158°F)
Weight 46.0 kg (102 lbs) 68.0 kg (150 lbs)
Handwheel Side mounted (see fig. 2) Side mounted (see fig. 4)
Weight 19.0 kg (42 lbs) 19.0 kg (42 lbs)
Protection level (std)** IP55 IP 55
FIGURE 1 FIGURE 2 FIGURE 3 FIGURE 4
NOTE
* = Optional temperature: -40°C to +80°C [-40°F to +158°F]
** = Optional protection level: IP66

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YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
Assembly of a ‘Yarway’ standard duty A.T.-Temp Desuperheater
Air filter regulator
E/P-postioner
Water inlet
Water outlet
FIGURE 5

4
YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
ACTUATOR/DESUPERHEATER DISASSEMBLY
(SEE FIG. 6 AND 7)
Before any maintenance operation on the
Yarway Desuperheater fitted with a Yarway
actuator model 20 - 55/20 - 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. 6 and 7) through
the screws. Cut-off the air on the
diaphragmcasing.
4. Unscrew the lock 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.
TABLE 2 - SPARE PARTS
Model 20 - 55 (fig. 6) Model 20 - 90 (fig. 7)
Item Quantity Name Part no. Item Quantity Name Part no.
3 1 Plate bolt M14 x 100 mm HN-3283 3 1 Plate bolt M14 x 100 mm HN-3283
5 1 Diaphragm ø 420 3N-1299-20 5 1 Diaphragm ø 420 3N-1299-20
6 1 Spring plate 3N-2336 6 1 Spring plate 3N-2286-20
19, 20, 21 Set 4 x bolts M8 x 100 mm / HN-3118 19, 20, 21 Set 4 x bolts M8 x 160 mm / HN-3117
4 x nuts M8 / 8 x washers / 8 x nuts M8 / 8 x washers /
4 x protecting tubes 8 x protecting tubes
7, 8 1Spring ø 59, 6 black, total 5
required per actuator
4N-2900-20 7, 8 1Spring ø 100 (inner), total 3
required per actuator
4N-3017-20
1Spring ø 59, 6 red, total 5
requiredper actuator
4N-3416-20 1Spring ø 140 (outer), total 3
required per actuator
4N-3016-20
13 1Bushing M35 x 1.5 mm brass 4N-2764-20 13 1Bushing M35 x 1.5 mm brass 4N-2764-20
1Bushing M35 x 1.5 mm GGGN60 4N-3858-20 1Bushing M35 x 1.5 mm GGGN60 4N-3858-20
Make sure that the identification number (indicated on the nameplate) is verified and specified when ordering spare parts.
Diaphragm exchange
• 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 by
applying160 Nm on bolt (3).
• 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 40 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.

5
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•
•
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ø 420
ø 360
55
95
9544400
•
•
••
•
•
•
5
16 17
21
25
23
22
24
26 14
10
13
15
12
8
20
6
18
4
3
2
1
19 27
28 •
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YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
MODEL 20 - 55
FIGURE 6
TABLE 3 - STANDARD MATERIALS
Item Qty. Name Material Dimension Item Qty. Name Material Dimension
1 1 Upper housing C-steel 16 1½” NPT socket A105 / C22.8
2 1 Limit block C-steel 17 1Hoisting lug C-steel
3• 1Bolt 12.9 M14 x 100 mm 18* 16 Bolt 8.8 M8 x 30 mm
4 1 Diaphragm plate C-steel 19*• 4Bolt 8.8 M8 x 100 mm
5• 1Diaphragm Rubber 20* 16 Nut Steel M8
6 1 Spring plate Aluminium 21* 4Washer C-steel
7• 5Spring right 22 1Cushioning plate Rubber
8• 5Spring left 23 1Support plate Aluminium
10 1Stem A182 F316 24 2Connector air snubber St. steel
12 1Lower housing C-steel 25* 1Washer C-steel M14
13• 1Bushing Brass / GGGN60+ 26 2Air snubber Brass
14* 3Yoke pillar C-steel 27* 4Nut 3D 8.8 M8
15 1Yoke plate actuator A105 / C22.8 28 3Bolt 8.8 M12 x 40
NOTES
- Dimensions may be subject to change without prior notification.
- Yarway will provide a certified dimensional drawing upon request.
- Bolts nr. 19 are used for disassembly of actuator and provided with protection tube.
* Zinc plated parts
+ Optional
• Recommended spares

6
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ø 420
ø 360
9544 225
400
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1
6
4
2
12
11
13
10
25
16
17
24
26
3
5
7
8
15
22
18
21
20
23
•
14
19 27
28 •
YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
MODEL 20 - 90
FIGURE 7
NOTES
- Dimensions may be subject to change without prior notification.
- Yarway will provide a certified dimensional drawing upon request.
- Bolts nr. 19 are used for disassembly of actuator and provided with protection tube.
* Zinc plated parts
+ Optional
• Recommended spares
TABLE 4 - STANDARD MATERIALS
Item Qty. Name Material Dimension Item Qty. Name Material Dimension
1 1 Upper housing C-steel 16 1½” NPT socket A105 / C22.8
2 1 Limit block C-steel 17 1Hoisting lug C-steel
3• 1Bolt 12.9 M14 x 100 mm 18* 16 Bolt 8.8 M8 x 30 mm
4 1 Diaphragm plate C-steel 19*• 4Stud 8.8 M8 x 200 mm
5• 1Diaphragm Rubber 20* 16 Nut Steel M8
6 1 Spring plate Aluminium 21* 8Washer 8.8 M8
7• 3Spring inside 22 1Cushioning plate Rubber
8• 3Spring outside 23 1Support plate Aluminium
10 1Stem A182 F316 24 2Connector air snubber St. steel
11 1Stroke limiter A106 Gr. B / ST.35.8 25* 1Washer 8.8 M14
12 1Lower housing C-steel 26 2Air snubber Brass
13• 1Bushing Brass / GGGN60+ 27* 4Nut 3D 8.8 M8
14* 3Yoke pillar C-steel 28 3Bolt 8.8 M12 x 40
15 1Yoke plate actuator A105 / C22.8

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ø 200
104
150
21 25
18
23
19
5
4
6
14
22
23
111
93
11
20
24
10
217 12
8
716
280
13
15
YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
TABLE 5 - STANDARD MATERIALS
Item Qty. Name Material Dimension Item Qty. Name Material Dimension
1* 1Mounting plate (upper) SA 105 14 1Parallel key C 45 5 x 5 x 20 mm
2* 1Mounting plate (lower) SA 105 15• 1Circlip Steel
3* 1Mounting plate (handwheel) St 37 K 16• 1Plain bearing PTFE
4• 1Drive shaft Al. bronze / GGGN60 17• 1Bearing bushing Nylon
5 1 Shaft left 1.4057 18* 1Eye bolt St 37.2
6• 1Shaft right 1.4057 19 1Padlock
7*• 1Helical gear C-steel 20* 2Pillar SA 105
8* 1Parallel key C 45 8 x 7 x 24 mm 21 2Screw St. steel M5 x 10 mm
9*• 1Pinion C-steel 22 1Nameplate St. steel
10 1Cover St. steel 23 1Handwheel Aluminium
11* 8Bolt 10.9 M12 x 40 mm 24* 1Gear bushing SA 106 Gr. B
12* 1Bushing (handwheel) SA 105 25 2Ring St. steel M5
13*• 1Spindle (handwheel) SA 105
FIGURE 8 - SIDE-MOUNTED HANDWHEEL
NOTES
* Zinc plated parts
• Recommended spares

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YARWAY MODEL 20 PNEUMATIC DIAPHRAGM ACTUATOR
INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS
MAINTENANCE
Maintenance of the Yarway 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.
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
Yarway 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.
MANUAL OPERATOR
• The Yarway 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padlock (19).
• The handwheel will not turn during actuated
operation of the actuator assembly and/or
Desuperheater assembly.
• By unlocking the padlock, 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.
TABLE 6 - SPARE PARTS
Item Qty Name Part number
7, 9 + 13, 15, 16, 17 1Spares SM handwheel 4N-4307-20
4, 5, 6 1Spindle kit SM handwheel Al Bronze 4N-4308-20
4, 5, 6 1Spindle kit SM handwheel GGGN60 4N-4310-20
NOTES
- 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.
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 2014/68/EC under
category I with CE-marking and ATEX 2014/34/
EC. See actuator name plate.
© 2017 Emerson. All rights reserved.