Metso Neles BW Series Operating and maintenance manual

Metal seated high performance
disc valve
Series BW
Installation, Maintenance and
Operating Instructions
2 BW 70 en • 11/2015

22 BW 70 en
CONTENT
1 General ............................................................................3
1.1 Safety precautions..............................................................3
1.2 Product & function description....................................3
1.3 Intended use .........................................................................3
1.4 Scope of delivery.................................................................4
1.5 Visual inspection .................................................................4
1.6 Marking and identification.............................................5
1.7 ATEX, ASME & CE-marking.............................................. 5
1.8 Contact ....................................................................................5
2 Transport, reception and storage ................................5
3 Installation ......................................................................5
3.1 Installation planning .........................................................5
3.2 Preliminary.............................................................................5
3.3 Installation..............................................................................6
3.4 ATEX-version .........................................................................8
3.5 Demounting..........................................................................8
3.6 Cleaning and maintenance interval...........................9
4 Detaching and mounting the actuator .......................9
4.1 General.....................................................................................9
4.2 Mounting preparation......................................................9
4.3 Mounting................................................................................9
4.4 Detaching preparation.................................................. 10
4.5 Detaching............................................................................ 10
5 Tools...............................................................................10
6 Ordering spare parts....................................................10
7 Exploded view and parts list...................................... 11
8 Troubleshooting...........................................................12
9 Safety instructions .......................................................12
10 Maintenance .................................................................12
10.1 Cleaning and maintenance interval........................ 12
10.2 Preliminary.......................................................................... 13
10.3 Demounting....................................................................... 13
10.4 Reassembly......................................................................... 13
10.5 Replacement of the metallic seat ring ................... 14
10.6 Replacing worn parts..................................................... 15
10.7 Replacing the gland packing...................................... 17
10.8 Valve screws – Clamping torque............................... 18
11 Type code ......................................................................19
READ THESE INSTRUCTIONS FIRST!
These instructions provide information about safe handling and operation of the valve.
Please note also that additional information may have been supplied within a given project and is included in the project
documentation.
If you require additional assistance, please contact the manufacturer or manufacturer’s representative.
Addresses and phone numbers are printed on the back cover.
See also www.metso.com/valves for the latest documentation.
SAVE THESE INSTRUCTIONS!
Subject to change without notice.
All trademarks are property of their respective owners

2 BW 70 en 3
1 General
1.1 Safety precautions
1.2 Product & function description
High performance disc valve series BW; metallic sealing;
bidirectional.
Type of body:
□Monoflange, lug
□Double flange
□Wafer
□Buttweld
Nominal size:
□DN 150 - DN 600
□NPS 6 - NPS 24
Pressure rating:
□PN 150 - PN 420
□CL 900 - CL 2500
Temperature range for standard valves:
□Operating temperature 0 °C to + 525 °C for carbon
steel and low alloy steel
-50 °C to 525 °C for
stainless steel
□Storage temperature 0 °C to +80 °C
□If operating temperature > +525 °C, please consult
factory
Function description:
The high performance disc valve series BW has been
designed to have a shut-off disc, in order to guarantee that
the sealing element has a long service life.
The sealing element, a metallic sealing, is located in the
valve body, safe from the wearing effect of the flow media,
allowing it to retain its tightness for a long period of time.
The valve is closed when the disc is in a rectangular position
to the flow direction. The distance between OPEN and
CLOSED amounts to 90°, and the disc is driven by an actua-
tor (manual, electric, pneumatic or hydraulic). There is a
marking on the drive shaft as well as on the seat side of the
extension. The valve is closed when the two markings are
aligned.
The valve closes clockwise.
1.3 Intended use
The delivered valve has been designed especially in accor-
dance with the requirements, which are noted in the order-
related specification.
This applies especially to the operation parameter pressure,
temperature medium and cycle rates.
If the process parameters are exceeded, this can lead to
valve damage.
The damaged parts must be changed immediately.
CAUTION:
Do not exceed the valve performance limitations!
Exceeding the limitations marked on the valve may cause
damage and lead to uncontrolled pressure release.
Damage or personal injury may result.
CAUTION:
Do not dismantle the valve or remove it from the pipe-
line while the valve is pressurized!
Dismantling or removing a pressurized valve will result in
uncontrolled pressure release. Always isolate the relevant
part of the pipeline, release the pressure from the valve and
remove the medium before dismantling the valve. Be aware
of the type of medium involved. Protect people and the
environment from any harmful or poisonous substances.
Ensure that no medium can enter the pipeline during valve
maintenance.
Failure to do this may result in damage or personal injury.
CAUTION:
Beware of the disc’s cutting movement!
Keep hands, other parts of the body, tools and other
objects out of the open flow port. Leave no foreign objects
inside the pipeline.
When the valve is actuated, the disc functions as a cutting
device. The position of the disc can also be changed when
moving the valve.
Close and detach the actuator pressure supply pipeline for
valve maintenance.
Failure to do this may result in damage or personal injury.
CAUTION:
Beware of noise emissions!
The valve may produce noise in the pipeline. The noise level
depends on the application. It can be measured or calcu-
lated using Metso Nelprof valve- sizing software.
Observe the relevant work environment regulations on
noise emissions.
CAUTION:
Beware of a very cold or hot valve!
The valve body may be very cold or very hot during use.
Protect yourself against cold injuries or burns.
CAUTION:
When handling the valve or the valve package, bear in
mind its weight!
Never lift the valve or valve package by the actuator, posi-
tioner, limit switch or their piping.
Valve sizes DN 400 and over are equipped with lifting eye
bolts.
Place the lifting ropes securely around the valve body.
Advise caution when lifting, because the disc may turn.
Damage or personal injury may result from falling parts.
NOTE:
Do not turn the disc more than 90°, since this could dam-
age the seat. The valve is constructed so that the disc
operates only between 0°- 90°.

42 BW 70 en
The pipeline and medium used must be free of dirt – other-
wise the tightness of the valve may be affected.
It is part of the intended use of the valve that the operating,
mounting and maintenance personnel have read and
understood this IMO manual.
Only qualified personal may perform the installation work.
Metso assumes no liability for structural modifications car-
ried out without explicit consent of the corporation.
Use original spare parts only.
Spare parts should be installed by Metso service personnel.
1.4 Scope of delivery
The series BW valve is available in four versions: lug (monof-
lange), doubleflange, wafer, buttweld.
The valve is normally delivered with the actuator.
1.5 Visual inspection
Before leaving Metso, the valve has been inspected for
tightness and functionality by Metso Quality Control and
set for operation in accordance with the order-related spec-
ifications.
Before installation, please check the valve for possible
transport damage. If delivery parts are damaged, please
contact Metso service personnel before any further actions.
Before installation, please check the valve for functionality.
Proceed as follows:
□Lifting ropes are necessary, depending on the size and
weight of the valve.
Fasten the lifting ropes once around the valve body
twice on the actuator (see Figure 1) for the horizontal
transport position.
For valve sizes with a weight of more than 1t, the valve
and actuator are equipped with lifting lugs to fix the
lifting ropes.
If you fix the ropes on the actuator, the shaft may be
damaged.
Fig. 1 Lifting in horizontal position
Fasten the lifting ropes on the actuator only for a verti-
cal transport position. (see Figure 2)
Fig. 2 Lifting in vertical position
□Visual inspection – all screws should be tightened cor-
rectly
□Visual inspection for damage on the following parts:
□disc
□shaft
□actuator and tubing
□gland packing
□sealing elements
□sealing surface of the valve
□Bring the valve into a vertical position.
The valve may move in an uncontrolled manner during
the check. For this reason, ensure that the valve cannot
move or tilt over under any circumstances.
Normally valid:
View from above on the drive shaft of the disc:
Counterclockwise rotation = OPEN, Clockwise rotation =
CLOSE (see Figure 3).
Fig. 3 Direction of rotation of the actuator and disc position
If the valve does not operate correctly during inspection,
please contact Metso peromnel.
CAUTION:
Danger of twisting!
marking on the driveshaft
open against
clockwise direction
close in clockwise
direction

2 BW 70 en 5
1.6 Marking and identification
The valve specifications are placed on the identification
plate.
For maintenance and/or repair, the unique number
(Unique-No) is needed to identify the valve
This number is also engraved in the valve body, so you can
find it even if it cannot be easily detected from the Identifi-
cation plate.
Further information:
Job-No = Job number of Metso
Unique-No = Serial number of the valve
Type = Type code of the valve
Body = Body material
YEAR = Year of manufacture
NPS or DN = Size; CL or PN = Pressure class
ID-No. = Customer identification number
Tag-No = Valve number
TS. = Valve max. working temperature
in °C (medium)
PS = Valve max. design pressure at max. temp
P.O.NO. = Customer’s order number / commission
number
Cv = Flow rate in gal/min
EX II 2GcTx = ATEX-marking
CE = CE0036 (notified body for PED)
To display the trim in the built-in condition of the valve, you
will find the following markings (see Fig. 4):
Fig. 4 Identification plate
□Colored marking on the shaft.
If colored markings on shaft in direction of flow are aligned,
the valve is "CLOSED". The sealing element is located on the
side of the body where you see the colored marking.
Open and close like a tap. (seen from the actuator side).
1.7 ATEX, ASME & CE-marking
The valve meets the requirements of the European Direc-
tive 2014/68/EU relating to pressure equipment and the
ASME B 16.34-2009, and has been marked in accordance
with these directives.
The ATEX, ASME and/or CE markings are placed on the
Identification plate (see Figure 3)inaccordancewiththe
specification of the valve.
1.8 Contact
Please contact your local Metso Partner on:
www.metso.com/valves
2 Transport, reception and storage
Check the valve – including equipment – for any damage
that may have occurred during transport.
Store the valve carefully before installation, preferably
indoors in a dry place.
Storage temperature = -20° … 80 °C
Humidity 85 % max (non-condensing)
The valve must be stored with the appropriate factory-
made flow port protectors.
The valve is usually delivered in the closed position.
A valve equipped with a spring-return actuator is delivered
in a position determined by the spring. During storage the
valve must be lightly closed.
Transport the valve on-site not until the installation will be
performed.
Remove the flow port protectors before installation.
3 Installation
Only qualified personnel are permitted to perform
installation work on the valve!
3.1 Installation planning
Before installation, consider the following aspects:
□Install the valve so that the actuator is easy to access.
□Do not connect the power supply of the actuator
(electrical, pneumatic or hydraulic energy) until the
installation of the valve is completed.
□The flange holes of both pipe ends must be exactly
aligned and the sealing surface of the opposing flanges
must be exactly parallel. The flange holes must not be
twisted against each other, to ensure that the installa-
tion cannot cause any stress in the valve. (see Figure 5)
Fig. 5 Check the flange position before installing
3.2 Preliminary
Flush or blow the pipeline carefully before installing the valve.
Foreign particles – such as sand, rust, dirt or welding residues –
will affect the tightness of the valve and damage the disc-seal-
ing surface and seat. This is very important for installation of
valves in new plant sections. Also during this process, the
medium must not carry any contaminant which may settle in
the sealing area.

62 BW 70 en
Advise caution when installing flaps with safety posi-
tion “spring-to-open”.
If the disc accommodates the total length of the valve, the
disc shall be closed prior to the installation (pneumatic,
hydraulic, etc.). Be sure that the energy supply is safely fas-
tened and cannot be damaged or break off during installa-
tion.
If there is a sudden shutdown of energy supply, the valve
will be opened abruptly by the pre-stressed spring pack-
age. This may cause severe personal injury and material
damage.
Heavy valves to be mounted in a pipeline need a hoist. The
total weight of the valve package can be found in the order
related documentation.
Place the lifting ropes securely around the valve body –
not on the actuator. Otherwise, you may damage the
valve (see Figures 1 and 2).
3.3 Installation
To install the high performance disc valve, proceed in the
following way:
□If no indication of the valve installation direction is
given, install the valve to have the shaft side on the
upstream side.
□If the mounting direction is mentioned, bring the valve
in a position so that the arrow (P=pressure) follows the
process pressure direction. (see Figure 6)
Fig. 6 Mounting direction
□Close the valve for installation. In the open position, the
disc-sealing surface can accommodate the total length
of the valve body and may be damaged at installation.
□Please note the minimum piping inside diameter
according to ASME B36.10M, ASME B36.19M respec-
tively DIN EN 10305-2 and DIN EN 10305-5.
□Insert a flange gasket on both sides of the valve
between the valve body and pipeline flange. Gaskets
are not included to the standard delivery.
□Piping bolt dimensions and quantities can be found in
Fig. 7 and Tables 1-3.
□Screw the stud bolts opposite to each other as well as
the bolts, flange screws and hex nuts crosswise and
equal with a torque key, in accordance with the parame-
ter of the operator (see Figure 8).
□Connect the energy supply as the final procedure.
Fig. 7 Stud bolt dimensions
BW 3, BW 4 BW 6

2 BW 70 en 7
BW3 (double-flanged)
Fig. 8 Sample for a crosswise
installation with twelve
flange holes.
Table 1 Stud bolt dimensions
BW3 - Class 900
NPS thread K L
length QTY
6 1 1/8"-8UN 190 24
8 1 3/8"-8UN 220 24
10 1 3/8"-8UN 240 32
12 1 3/8"-8UN 260 40
14 1 1/2"-8UN 280 40
16 1 5/8"-8UN 290 40
18 1 7/8"-8UN 330 40
20 2"-8UN 350 40
24 2 1/2"-8UN 440 40
26 2 3/4"-8UN 460 40
28 3"-8UN 480 40
30 3"-8UN 490 40
32 3 1/4"-8UN 530 40
34 3 1/2"-8UN 560 40
36 3 1/2"-8UN 570 40
38 3 1/2"-8UN 610 40
40 3 1/2"-8UN 620 48
42 3 1/2"-8UN 640 48
44 3 3/4"-8UN 670 48
46 4"-8UN 710 48
48 4"-8UN 720 48
Table 2 Stud bolt dimensions
BW3 - Class 1500
NPS thread K L
length QTY
6 1 3/8"-8UN 260 24
8 1 5/8"-8UN 300 24
10 1 7/8"-8UN 340 24
12 2"-8UN 380 32
14 2 1/4"-8UN 420 32
16 2 1/2"-8UN 460 32
18 2 3/4"-8UN 500 32
20 3"-8UN 550 32
24 3 1/2"-8UN 630 32
Table 3 Stud bolt dimensions
BW3 - Class 2500
NPS thread K L
length QTY
6 2"-8UN 350 16
8 2"-8UN 390 24
10 2 1/2"-8UN 490 24
12 2 3/4"-8UN 550 24
14 3 1/4-8UN 660 24
16 3 1/2-8UN 720 32
18 3 1/2-8UN 760 32

82 BW 70 en
3.4 ATEX-version
ATEX certified valves shall be professionally connected by
the end user to a main grounding point at the site, in accor-
dance with the applicable regulations in effect in the coun-
tries concerned. The grounding of the valve is the responsi-
bility of the end user. Operation without grounding is not
permitted!
The grounding connection is a marked screw with the
earthing symbol. This screw can be found from eg., the
body, flange or bracket (see Figure 9).
The grounding cable must be installed with a braided wire
having at least 16 mm2 of conductive area to the ground-
ing point in the piping construction.
ATEX certified valves must only be serviced and maintained
by Metso Service or authorized personnel.
Fig. 9 Grounding
3.5 Demounting
Ensure that:
□the pipeline is pressureless, flushed and empty.
□the mentioned valve is disconnected from the process.
□the valve is in a defined position (normally closed).
For demounting the valve, proceed in the following order:
□Close the valve.
□When detaching the actuator to demount the valve, the
actuator should be tagged to the bracket and the valve
body with a waterproof marker (Figure 10). It makes it
easy to find the correct position of the actuator at reas-
sembly and the actuator cannot cause a malfunction.
□Further instructions for detaching the actuator can be
found in Chapter 4.
Fig. 10 Before detaching the actuator, tag its position to
the shaft and the disc on the bracket.
□Switch off the energy supply of the actuator.
□Detach the actuator.
□Support the valve carefully with a hoist. Place lifting
ropes in the correct position on the body (not the shaft!)
of the valve.
□Demount the valve by unscrewing the opposite pipe-
flange bolts crosswise.
□Lift and transport the valve carefully to protect it from
damage.
Metallic bright surface at the body, flange or bracket
1 … hex-head bolt
2 … grounding cable (min. 16 mm2)
3 … hex-head bolt
4 … hex nut
5 … grounding rod
Pos.1 up to 5 must be supplied by the client!
12
3
4
5
CAUTION:
Danger of explosion!
Follow the end-user safety instructions!
Marking

2 BW 70 en 9
3.6 Cleaning and maintenance interval
Series BW high performance disc valves are extensively
maintenance-free.
To clean, use a soft and lint-free cloth only. Do NOT under
any circumstances use pointed or sharp tools (knife, file,
screwdriver, etc.) or sandpaper. Also, do not use any clean-
ing agents that may cause undesirable chemical reactions
with the residues of the medium or attack the sealing ele-
ments.
Check the tightness of the valve at regularly intervals.
Metso recommends to inspect the condition of the fol-
lowing parts after two years at the latest to change
them if necessary, see Fig. 11:
gland packing (451),
metallic sealing element (321),
sealings (107, 301, 304, 470),
axial bearing (404),
bearings (420, 424, 425)
After assembling the valve, you must always
replace the locking plate (447).
To order the necessary spare parts set, please
contact your Metso Service Partner.
Fig. 11 Sealings and bearings
4 Detaching and mounting the actuator
4.1 General
The actuator mounting is in accordance with DIN/ISO 5211.
All actuators based on this standard can be easily mounted
on the valve. Typical installations are with pneumatic- and
hydraulic actuators with valve controllers for control, ESD or
on/off use, or with electric actuator or manual gear.
4.2 Mounting preparation
The actuator used is normally on the customer’s request.
For safe mounting on site, you need a hoist and lifting
ropes.
4.3 Mounting
To mount the actuator, proceed in the following order:
□Turn the valve to the closed position before mounting
the actuator.
□Carefully position the indexing shaft of the actuator on
the valve shaft. Bear in mind that the actuator must be
mounted exactly and flush to the bracket, so that no
stress is allowed to occur on the valve shaft.
□Ensure that the jag on the indexing shaft conforms to
the position of the disc (see Figure 13).
□Fix the actuator with the appropriate screws and lock
them crosswise. Finally, check the closed position of the
valve by means of multiple depth measurements. The
detected data is not allowed to deviate more than
0.3mm (see Figure 12).
□As the last procedure, connect the energy supply.
Fig. 12 Checking the closed position by means of depth
measurement
420
451
321
107
424
470
304
404
425
447
CAUTION:
When handling the valve or valve package, bear in
mind its weight!
The actuator cannot be removed from the valve when
the pipeline is under pressure due to dynamic torque!
NOTE:
Before dismantling, carefully observe the position of the
valve with respect to the actuator and positioner/limit
switch to ensure that the package can be properly reas-
sembled.
The actuator must be mounted to be easily accessible,
particularly for possible emergency manual override.
CAUTION:
When handling the actuator, bear in mind its weight!

10 2 BW 70 en
Fig. 13 The markings on the actuator conform to the posi-
tion of the disc
4.4 Detaching preparation
If the actuator is mounted in a pipeline the following condi-
tions shall be met before starting to detach the actuator:
□Ensure, that the detaching of the actuator will not cause
any fault.
□Check carefully if hot medium has been flown through
the pipeline and if the actuator has cooled down suffi-
ciently, so there exists no danger because of extreme
temperature.
□Ensure the flow medium of the pipeline does not cause
any danger to the service technician.
Dismantling of the actuator shall be done only by qualified
personnel.
4.5 Detaching
To detach the actuator, proceed in the following order:
□Ensure that the pipeline is pressureless and the men-
tioned valve is undocked from the process.
□Ensure the valve is in a defined position (normally
closed).
□Switch off the energy supply of the actuator.
□Support the actuator with lifting ropes.
□Unbolt the screws between the bracket and the actua-
tor. Pull the actuator carefully, vertical from the valve
shaft.
□Lift and transport the actuator carefully in order to pro-
tect it from damage.
Ensure that the energy supply of the actuator is safely
switched off before starting to detach the actuator.
5Tools
□No special tools are needed for servicing the valve.
6 Ordering spare parts
When ordering spare parts, always include the following
information:
□The unique number of the valve (on the type plate – see
Figure 4 – as well as additionally stamped on the valve
body)
□Name of plant, date of startup
□Type code (on the type plate – see Figure 4) with infor-
mation about size and pressure
□If possible, a picture of the type plate
□Number of the parts list, part number, name of part and
quantity required

2 BW 70 en 11
7 Exploded view and parts list
PARTS LIST
Part nr. Qty. Description Material
101 1 Body ASTM A217 gr. WC6
102 1 Extension ASTM A217 gr. WC6
103 variable Stud ASTM A193 gr. B7
104 variable Hexagon nut ASTM A194 gr. 7
107 1 Seal Graphite
108 1 Socket head set screw A2 Stainless steel
201 1 Disc EN 10213-1.4931+ENP
301 1 Seal ring ASTM A182 gr. F12 cl.2
303 1 Ring ASTM A182 gr. F12 cl.2
304 1 Seal Graphite
306 variable Hexagon screw ASTM A193 gr. B7
307 variable Hexagon nut ASTM A194 gr. 7
310 1 Retaining ring EN 10302-1.4923
321 1 Sealing element EN 10302-1.4923+Ag
401 1 Drive shaft 1.4923+Al2O3/TiO2
402 1 Shaft 1.4923+Al2O3/TiO2
404 2 Thrust washer EN 13835-0.7660
420 1 Bearing sleeve EN 13835-0.7660
424 1 Bearing sleeve EN 13835-0.7660
425 2 Bearing sleeve EN 13835-0.7660
428 1 Spacer ring AISI 304
429 1 Spacer ring AISI 304
430 1 Cover ASTM A182 gr. F12 cl.2
432 variable Stud ASTM A193 gr. B7
433 variable Hexagon nut ASTM A194 gr. 7
436 6 Sleeve AISI 316
440 variable feather key EN 10302-1.4923
444 2 Clamp disc AISI 316
447 2 Shim A2 Stainless steel
448 2 Hexagon screw ISO 3506 A2-70
451 4 Packing ring Graphite
452 1 Anti extrusion ring AISI 316
456 6 Washer AISI 316
457 72 Disc spring DIN 17222-1.8159
462 1 Feather key EN 10302-1.4923
470 1 Seal Graphite
476 6 Spring washer AISI 316
491 1 Gland AISI 316
492 1 Compression sleeve AISI 316
494 6 Hexagon nut ASTM A194 gr. 8M
496 6 Stud ASTM A193 gr. B8M2 cl. 2B
501 1 Bracket AISI 316
502 variable Hexagon screw ISO 3506 A2-70
503 variable Hexagon screw ISO 3506 A2-70
101 321 304 301 303 310 307 306
470
430
432
433
402
440
425
429
425
108
424
428
440
404
401
462
404
420
102
107
104
103
201
444
447
448
444
447
448
452
451
492
491
457
476
496
456
494
(501)
Flangetypes:
-Doubleflange (as in the drawing)
-Monoflange
-Lug- or Wafertype
436
(503)
(502)

12 2 BW 70 en
8 Troubleshooting
Valve leakage at the shut-off disc
□Never close the valve by force: irreparable damage may
occur.
□Check if the energy supply is connected.
□Check if the closed position of the actuator is in accor-
dance with the closed position of the disc.
□Check the sealing surface of the disc and the sealing ele-
ment for damages. If necessary dismantle the disc.
□Check if there is foreign material between the disc and
the sealing element. If necessary, remove foreign mate-
rial or deposits.
□If necessary, replace the damaged parts.
For dismounting, see chapter maintenance.
Observe the notes in Chapter 10. “Cleaning and mainte-
nance”.
Escape of fluid or gas...
...at the gland packing
1. Check if the gland is still precompressed by the disc
springs. Possibly the disc springs are damaged. In this
case you must change them
2. If the precompression is too less you must retighten the
nuts, but not up to the stop thereby the disc springs
will be damaged.
3. If the precompression of the disc springs is in order
then the gland packing is damaged and you must
change it
Notes for dismounting are found in the chapter on mainte-
nance.
…at the cover plate
Check to see that all cover screws are tightened well. If nec-
essary, change the sealing.
Notes for dismounting are found in the chapter on mainte-
nance.
9 Safety instructions
Please pay attention to the following safety instructions
when doing maintenance and when operating the high per-
formance disc valve:
1. For safety reasons, you are not allowed to carry out
modifications to the method of operation of the disc
valve or its actuator.
2. Only specialist personnel are allowed to carry out
installation work on the high performance disc valve.
3. There is a danger during the functional test that the
disc of the valve may move uncontrollably and sud-
denly due to the energy supply. Therefore, ensure that
the valve can not move or tip under any circumstances
during the functional test.
4. Take care during the installation of valves with the
safety position "spring open". If the disc extends over
the installation length of the valve, the valve must be
closed before installation (pneumatically, hydraulically,
etc.). Ensure in particular that the energy supply is
safely secured and cannot be damaged or torn in any
way during installation.
If the energy supply is suddenly interrupted, the valve
opens abruptly. This can lead to severe injury and dam-
age to materials.
5. During possible maintenance work, there is considera-
ble risk of injury by the accidental use of the remote
control. If you plan to perform remote control for the
work with the valve, ensure that the energy supply of
the actuator is switched off.
6. Ensure that the cleaning substance will not cause any
unwanted chemical reactions in connection with possi-
ble residues in the high performance disc valve.
7. If you work in the area of the sealing surface of the disc,
secure the latter with wooden wedges to prevent the
risk of crushing. Take care that by doing this the sealing
surface of the disc is not damaged.
8. If the seals are destroyed by a medium which is too hot,
the medium used may leak at the shaft.
10 Maintenance
10.1 Cleaning and maintenance interval
Series BW high performance disc valves are, to a large
extent, maintenance-free.
Check the valve regularly for its tightness. We recom-
mends replacement of the metallic sealing element
(321) and the packing rings (451) on demand or in criti-
cal applications after a period of two years at most, see
Fig. 14.
When allocating cleaning or maintenance work to qualified
outside companies or qualified outside personnel, draw
attention to the risk of the medium used and, if necessary,
the existing residues. Make this IMO available to these per-
sonnel.
Fig. 14 Replacement of metallic sealing element and
packing rings
If the medium has contamination which could impair the
tightness of the valve, the sealing surface of the disc must
be cleaned regularly. Contamination can damage the seal-
ing surface of the disc or sealing element.
Cleaning substances which could attack the sealing surface
or the metallic seal shall not be used to remove residues.
Use water, soap suds or other solvents as well as a soft, lint-
free cloth.
Never use cutting, scraping or grinding tools like files or
emery paper. Do not use solvent containing substances
which can cause unwanted chemical reactions with the
residues of the medium or/and attack the seal.
451
321

2 BW 70 en 13
10.2 Preliminary
In order to avoid longer shutdowns during the mainte-
nance work, suitable spare parts should be kept ready or
procured in time. Take the delivery times and transporta-
tion into account.
□Ensure that the pipeline is free of pressure and free of
process gases and fluids.
□Check that the disc valve has cooled down or warmed
up to the extent that there is no longer any risk of
extreme temperatures.
□Find out which medium passed through the valve when
before it was dismanteled from the pipeline. There could
be residues in the valve. Ensure that there is no risk of poi-
son or acid when coming into contact with the residues.
Appropriate protective clothing, eye protections and respi-
ratory protection shall be used. The operator’s safety
instructions must be followed.
□When installing and dismounting the disc valve, the
valve must be closed in order to rule out damage during
installation and dismounting.
10.3 Demounting
When dismounting the disc valve, please proceed as fol-
lows:
□Close the disc valve.
□If the actuator must be removed from the disc valve,
mark the position of the actuator to the bracket and to
the body with a permanent marker before dismounting
(see Figure 15). In this way, you can find the right posi-
tion of the actuator when re-mounting, and it cannot
trigger a malfunction.
Fig. 15 Marking the position of the actuator
□Switch off the power supply of the actuator.
Dismount the actuator. For further instructions, see Section
4.5 in this IMO.
□Support the disc valve with lifting ropes. Put the lifting
ropes on the body (not on the shaft) of the disc valve.
□Remove the disc valve by loosening the screws or nuts
(opposite to each other) crosswise.
□Transport the disc valve in such a way that it cannot
move or be damaged during transportation.
10.4 Reassembly
To re-install the disc valve please proceed as follows:
□Close the disc valve.
□Make sure the marking at the actuator shaft is inline
with the marking on the body when reinstalling the
valve (see Figure 16).
□There is a marking at the end of the actuator shaft and
on the shaft extension of the disc valve. The marking at
the actuator shaft must be in line with the marking on
the body when re-installing the valve.
□When the markings are aligned, the valve is closed
Fig. 16 Installation markings
□Put the actuator in the closed position.
□Ensure that the actuator is placed in the correct position
on the actuator shaft by using the marking made on the
bracket and the actuator when the valve was dis-
mounted (see Chapter 4). The aligment shall be as exact
as possible for all components (body – bridge – actua-
tor). Use the same marking for this that you made on the
bracket and on the actuator when you dismounted the
valve, and ensure as exact alignment of all parts (body –
bridge – actuator) as is possible (see Chapter 4)
□Install the disc valve to the pipeline (see Chapter 3).
Marking
Marking on the
actuator shaft

14 2 BW 70 en
10.5 Replacement of the metallic seat ring
Please proceed as follows:
Fig. 17 Replacement of the metallic seat ring
Demount the valve in its CLOSED position (see Figure 18).
For further instructions, see Section 4.5 of this IMO.
1. Secure the valve on a solid base or workbench so that it
cannot slip or tip.
Fig. 18 Valve in CLOSED position
9. Loosen the hexagon-head screws (306) (see Figure 19).
Fig. 19 Loosen the screws (306)
10. Demount the retaining ring (310) (see Figure 20).
Fig. 20 Demount the retaining ring (301)
11. Remove the rings (301, 303) and the sealing (304). (see
Figures 21 - 23)
Fig. 21 Remove the outer seal lock ring (303)
Fig. 22 Remove the inner seal lock ring (301)
310321301 306 307303304

2 BW 70 en 15
Fig. 23 Remove the sealing ring (304)
12. Now you can remove the metallic seat ring (321) (see
Figure 24).
Fig. 24 Replace the metallic seat ring (321)
13. Before replacing the metallic seat ring and the sealing
the parts shall be cleaned thoroughly.
14. Before reassembly check all parts for traces of wear. Use
Molykote BR2 for the hexagon-head screws on the top
and on the thread of the screws.(see Figure 25 - 26)
Fig. 25 Lubricate the screws with Molykote
Fig. 26 Lubricate the screws with Molykote
15. Check the high performance disc valve for its tightness
before reinstallation. Instruction can be in Section 3.3
"Installation".
10.6 Replacing worn parts
In order to replace worn parts, proceed as follows:
See Figures 27-33, the corresponding part numbers being
within brackets.
1. Remove the actuator and the adapter (501) by loosen-
ing the hexagon-head screws (502, 503).
2. Demount the metallic seat ring (321) as shown in Sec-
tion 12.5.
3. Swivel the disc 180° to have free access to the clamping
discs (444) and the retaining plates (447).
4. Demount the cover (430) on the backside of the valve.
Now you can remove the sealing (470) and the shaft
(402).
5. On the front side (actuator side), remove the gland
(491) and the packing rings (451).
6. Demount the shaft extension (102).
7. Remove the sealing (107) and the actuator shaft. (401).
Fig. 27 Remove the actuator
Actuator Screws Adapter

16 2 BW 70 en
Fig. 28 Disc backside
Fig. 29 Remove the cover (430)
Fig. 30 Remove the sealing ring (470)
Fig. 31 Remove the gland and the packing ring (491, 451)
Fig. 32 Remove the extension (102)
Fig. 33 Remove the sealing ring and the actuator shaft
(107, 401)

2 BW 70 en 17
Now the following parts can be changed with the recom-
mended spare part sets:
8. All parts must be cleaned accurately before reassembly.
9. Check the shafts for wear. It is recommended to replace
the shafts if any grooves or other damage is found.
10. The reassembly takes place in reverse order. To avoid
damage to the seals, install the bearing bushings (420,
424, 425) with extreme care.
11. Tighten the cover screws (103, 432) using a suitable
torque wrench for the given torques, in compliance
with Section 10.8.
12. Check the high performance disc valve for its tightness
before reinstallation. The instructions for installation
can be found in Section 3.3 Installation.
10.7 Replacing the gland packing
Pre-compressed graphite rings are used as a standard gland
packing. The packing construction is live loaded as stan-
dard.
The graphite packing (451) shall be changed if leakage
occurs even after the hexagon nuts (494) have been tight-
ened as recommended.
□Make sure the valve is not pressurized.
□Unfasten the nuts (494) and remove the washer (456),
the spring washer (476), the disc springs (457), the
sleeve (436), the gland (491) and the compression ring
(492).
□Remove old packing rings (451). Do not damage the sur-
face of the packing ring counterbore and shaft. It is not
necessary to change the anti-extrusion ring (452).
□Clean the gland and packing ring counterbore. Install
new set of graphite packing. Slip the rings onto the
shaft. Ensure that there are no burrs in the keyway
groove which could damage the packing. Position the
cut ends of the graphite rings at 90° angle to each other.
□Mount the compression ring.
□Install the gland.
□Put the sleeves on the studs.
□Mount the disc springs according Figure 34.
□Put the spring washers on top.
□Add the washers.
□Place the nuts on the washer.
□Compress the gland packing by tightening the nuts
crosswise with a torque wrench until the disc springs
have a value of compression (h1- h2) as in Table 5.
□Carry out 3-5 operation cycles with the valve. Suitable
range of movement is about 80 %. It is not necessary to
fully close or open the valve during operation.
□Re-tighten the nuts with a torque wrench until the disc
springs have a value of compression (h1- h2) as in Table
5 if necessary.
If leakage still occurs when the valve is pressurized, re-
tighten the nuts but do not exceed the value of compres-
sion (h1- h2) in Table 5 by 50 % or do not fully compress the
disc springs.
Fig. 34 Gland packing
Table 4 Spare part sets
Quantity
/ Valve Description Contents
1x Set 1 (Soft parts) Pos.107, 451, 470
1x Set 2 (Sealing) Pos. 321, 404, 424, 425, 447, 456, 457
304, 420, 452, 476
1x Set 3 (Heavy overhaul) Pos. 201, 401, 402
301, 303, 310, 491, 440, 462, 492
CAUTION:
Do not dismantle the valve or remove it from the pipe-
line while the valve is pressurized!!
gland (491)
anti-extrusion ring (452)
graphite packing (451)
disc spring (457) sleeve (436)
spring washer (476)
washer (456)
nut (494)
stud (496)
compression ring (492)
n = amount of disc springs in spring set
i = amount of disc springs in spring stack
for all valves:
n = 3
i = 4
h2
Ød
h1

18 2 BW 70 en
10.8 Valve screws – Clamping torque
Permissible clamping torque for screws of category A193
Gr. B7(M) and A193 Gr. B8M2 with standard metric thread,
according to DIN 13. The values are only valid for standard
configuration.
Table 5 Tightening of gland packing
Shaft diameter at
packing [mm] Body class Stud Spring outside diameter d [mm]
Compression
h1-h2 [mm]
Height uncompressed
h1 [mm]
Height compressed
h2 [mm]
30 900, 1500
M12 35.5
1.6
2.1
37.2
35.6
35.1
2500
35 900, 1500 1.6
2.1
35.6
35.1
2500
40 900, 1500 1.7
2.2
35.5
35
2500
45 900, 1500
M16 45
2.1
2.9
44
41.9
41.1
2500
50 900, 1500 2.4
2.9
41.6
41.1
2500
55 900, 1500 2.4
3.2
41.6
40.8
2500
65 900, 1500
M20 50
2.3
2.7
50.4
48.1
47.7
2500
70 900, 1500 2.3
2.9
48.1
47.5
2500
75 900, 1500 2.3
3
48.1
47.4
2500
85 900, 1500 2.6
3.5
47.8
46.9
2500
95 900, 1500
M30 71
3.4
4.5
69.4
66
64.9
2500
105 900, 1500 3.7
4.9
65.7
64.5
2500
120 900, 1500 4.2 65.2
135 900, 1500 4.7 64.7
Table 6 Clamping torque, for standard configuration only
Thread Cover tube & cover plate Sealing element
Clamping torque / Nm Preload force / N Clamping torque / Nm Preload force / N
M8x1,25 15 9900 21 14000
M10x1,5 29 15400 41 22000
M12x1,75 51 22900 72 32500
M16x2 123 42100 175 60000
M20x2,5 240 65900 340 94000
M24x3 416 95000 590 125500
M30x3,5 830 151000 1180 215700
M36x4 1440 220000 2050 314000
M42x4,5 2300 303000 3250 432800
M48x5 3450 396000 4900 565700
M56x5,5 5500 545000 7800 778500

2 BW 70 en 19
11 Type code
1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. / / 13. 14.
BW 3 G/D 1 B 56 P N2N1N1G3
1. sign
–
2. sign PRODUCT SERIES / DESIGN
BW Metal seated butterfly valve, triple eccentric available as Double flanged,
Lug, Wafer or Butt weld end type.
3. sign BODY CONSTRUCTION
2Flanged, long pattern
3Flanged, short pattern
4Lug or Mono flange or single flange
6Wafer
7No Entry + Butt Weld ends
8Top entry, Side Access + Butt Weld ends
9Top entry, Top Access + Butt Weld ends
YSpecial, to be specified
4. sign
Body BODY PRESSURE RATING 4. sign
Trim
TRIM PRESSURE RATING
Use trim rating e.g. /C
if not full rated
C ASME class 150 /C ASME class 150
DASME class 300 /D ASME class 300
FASME class 600 /F ASME class 600
GASME class 900 /G ASME class 900
HASME class 1500 /C ASME class 150
HASME class 1500 /H ASME class 1500
IASME class 2500 /I ASME class 2500
BW1H/F...-> full rated body #1500, de-rated trim #600. Corresponding PN pressure
classes also avaiable.
5. sign SEAT DESIGN
1
U-Type Metal seat with coating (sign 11).
Max tightness in preferred direction API 598 or FCI 70.2 cl V (std),
FCI 70.2 cl VI (optional), EN12266 Rate B.
Non-preferred direction, FCI 70.2 cl V (Air).
2
Double seat, metal + soft (Tmax limited by soft seat).
Max tightness in preferred direction, API 598, FCI 70.2 cl VI, EN12266 Rate A.
Non-preferred direction, FCI 70.2 cl VI (Air).
Max pressure 100 bar.
4
Double seat on valve body + leak off connection between the seat.
Max tightness in preferred direction, API 598.
Max tightness in non-preferred direction, FCI 70.2 cl VI (Air).
8
Solid proof.
One sealing ring on the disc + seat on the body.
Max tightness in preferred direction, API 598, FCI 70.2 cl V.
Max tightness in non-preferred direction, 100 x FCI 70.2 cl V (Air).
YSpecial construction.
6. sign BEARING AND BODY DESIGN
ASoft bearings, PTFE or eq. on metal net Tmax 250 °C, trim rating max #600.
B
Metallic or carbon bearings for high temperature.
(e.g. GGG-CrNi or stellite or high performance carbon bearings).
Tmax 500 °C.
H
Metallic or carbon bearings for high temperature.
(e.g. GGG-CrNi or stellite or high performance carbon bearings).
Temp: 500-850 °C.
HH
H + cooling ribbons.
(e.g. GGG-CrNi or stellite or high performance carbon bearings) cooling
ribbons. Temp: 850-1150 °C.
SConstruction B + Steam jacket.
YSpecial construction.
For NACE, add "N" to sign. 6 "B" -> "BN"
7.
sign
SIZE
Note: Pressure rating = ASME -> inch sizes
Pressure rating = PN --> metric sizes
BW
Inch: 04, 06, 08, 10, 12, 14, 16, 18, 20, 24, 28, 30, 32, 36, 38, 40, 42 48, 52,
54, 56, 60, 64, bigger sizes on request
Metric: 100, 150, 200, 250, 300, 350, 400, 450, 500, 600, 700, 800, 900,
1000, 1200, 1400, 1500, 1600
NOTE:
- The factory will keep the right to change the material if the material is same e.g. from casting to forged
- With slash "/" the materials are double marked
8. sign BODY 9. sign DISC 10. sign SHAFT, PINS AND KEY
PASTM A216 WCB/ 1.0619 N2 ASTM A487 CA6NM (similar to 1.4317) N2 1.4021 (-10 °C to +400 °C)
FASTM A352 LCC G5 1.4931 N1 1.4923
NASTM A217 WC6 NASTM A217 WC6 CASTM SA564 Gr. 630(17-4PH)
UASTM A351 CK3MCuN (SM0254) UASTM A351 CK3MCuN (SM0254) UUNS31254 (SM0254)
U2 ASTM A890 4A (similar to 1.4517) U2 ASTM A890 4A (similar to 1.4517)
U3 ASTM A890 GR. 5A (similar to 1.4469) U3 ASTM A890 5A (similar to 1.4469)
G9 1.4923 K5 1.4462
G G 1.4313 (similar to A487 CA6NM)
NXM-19 (Nitronic 50 HS)
AASTM A351 CF8M / 1.4408 AASTM A351 CF8M eq.AISI 316/1.4408 C2 Gr. 660/1.4980 (pressure class 900 and above)
A2 ASTM A351 CF3M (AISI316L) A4 ASTM A351 CF8C eq. AISI 347/1.4552 C3 1.4980 (-200 °C to + 815 °C)
C2 ASTM A638 Gr. 660 (similar to 1.4980)
AF316
A2 ASTM A351 CF3M eq. AISI316L
HASTM A494 CW-6M (Hastelloy C) HASTM A494 CW-6M (Hastelloy C) H1 HAST C
TTitanium TTitanium TTitanium
NOTE: Check the recommend material combination from the Factory
NOTE: The list of materials have been shortened due to space limitations. Please consult Metso to find the availability of other materials.

20 2 BW 70 en
Metso Flow Control Inc.
Europe, Vanha Porvoontie 229, P.O. Box 304, FI-01301 VANTAA, Finland. Tel. [phone]. Fax [phone]
Von-Holzapfel-Str. 4, 86497 Horgau, Germany, Tel. [phone], fax + 49 (0) 8294 8695-4681
North America, 44 Bowditch Drive, P.O. Box 8044, Shrewsbury, MA 01545, USA. Tel. [phone]. Fax [phone]
South America, A v. Independéncia, 2500- Iporanga, 18087-101, Sorocaba-São Paulo, Brazil. Tel. [phone]. Fax [phone]
Asia Pacic, Haw Par Centre #06-01, 180 Clemenceau Avenue, Singapore 239922. Tel. [phone]. Fax [phone]
China, 11/F, China Youth Plaza, No.19 North Rd of East 3rd Ring Rd, Chaoyang District, Beijing 100020, China. Tel. [phone]. Fax [phone].
Middle East, Roundabout 8, Unit AB-07, P.O. Box 17175, Jebel Ali Freezone, Dubai, United Arab Emirates. Tel. [phone]. Fax [phone]
www.metso.com/valves
11. sign SEAT MATERIAL
Ferritic/Martensic
C
U-shape, 1.4923 or eq + silver coated
(disc ENP - Ni-coated)
T = -200 °C... + 850 °C
C2
U-shape,
A564 Gr 630 H1150M (17-4PH) /1.4542 + silver coated
(disc ENP - Ni-coated)
T = -30 °C... + 325 °C
Austenitic
AU-shape, 1.4980 or eq. + silver coated T = -200 °C... + 850 °C.
If sign 6 includes NACE -> ASTM A638 gr. 660 is used.
A1 U-shape, 1.4980 or eq. + silver coated (disc HCr coated) T = -200 °C... + 400 °C.
Other SEAT MATERIAL
SStellite/stellited sealing + stellited sealing surface, disc ENP - Ni-coated
YSpecial, to be specified
12.sign PACKING CONSTRUCTION
T3 Live loaded PTFE packing
T2 Live loaded PTFE double packing with one 1/4" NPT leak off connection
for shaft seal
G3 Live loaded graphite packing.
Inherently firesafe.
G2 Live loaded graphite double packing with one 1/4" NPT leak off
connection for shaft seal. Inherently firesafe.
YSpecial, to be specified
13.sign SURFACE FINISH FOR PIPE FLANGE FACE
-
Ra 3.2 - 6.3, standard, without sign
cover:
EN 1092-1 Type B1 (Ra 3.2 - 12.5)
ASME B16.5, Ra 3.2 - 6.3 (125 - 250 μm)
DIN 2526 Form E (Ra 4)
14. sign SPECIAL FLANGE FACING TYPES/FORMS
always check suitability from factory
05 Ring Joint
06 DIN EN 1092-1 Form F (tongue)
16 ANSI B16.5 Large Tongue (Ra 3.2)
YSpecial, to be specified
15. sign FLANGE
A sign for flange code needed, always check suitability from factory
-Without sign according to valve body pressure rating
ASME B 16.47 Series A #150 - 600, size 26" -60", #900 size max 48".
BASME 16.47 Series B (size 26" and bigger)
JPN 10
KPN 16
LPN25
MPN40
NPN63
PPN100
R10 JIS 10K (14 bar)
R16 JIS 16K (27 bar)
R20 JIS 20K (34 bar)
R30 JIS 30K (50 bar)
R40 JIS 40K (66 bar)
R63 JIS 63K (105 bar)
YSpecial, to be specified
16. sign Additional options
G1
1 grounding device
NOTE: if the valve construction contains intrinsical grounding feature
(graphite packing or conductive bearings) no additional grounding
device is needed (e.g. for ATEX)
G2
2 independent grounding devices
NOTE: if the valve construction contains intrinsical grounding features
(graphite packing and conductive bearings) no additional grounding
device is needed (e.g. for ATEX)