Watts bar PZDS Operational manual

bar-gmbh.de
2/2-way automatic butterfly valve
PZDS (with bar-agturn or actubar)
EZDS
IMPORTANT: This manual is only valid in conjunction
with the manufacturer documentation of the actuator
Translation of the original operating manual

2PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
Table of Contents
1. General information ...................................................................5
1.1 Reference documents.........................................................................................5
1.2 Validity of the operating manual......................................................................... 5
1.3 Notes to operating manual .................................................................................6
1.3.1 Signal words and symbols ......................................................................6
1.3.2 Explanation of the structure of the safety instructions..........................7
1.3.3 Descriptions in figures.............................................................................7
1.4 Responsibility of the operating company ..........................................................7
2. Safety ..........................................................................................8
2.1 General Safety Instructions ................................................................................8
2.2 Intended use........................................................................................................8
2.3 Reasonable foreseeable use ..............................................................................8
2.4 Organizational measures ....................................................................................8
2.4.1 Subsequent retrofitting or changes ........................................................8
2.4.2 Replacement of defective parts..............................................................8
2.5 Protective equipment..........................................................................................9
2.6 Personnel qualification .......................................................................................9
2.7 Dangers when handling the automatic butterfly valve....................................11
2.7.1 Dangers during assembly, maintenance and disassembly ................. 11
2.7.2 Dangers during functional checks, commissioning and operation..... 14
3. Product description .................................................................16
3.1 Butterfly valve ...................................................................................................16
3.2 Rotary actuator .................................................................................................16
3.3 Type plate..........................................................................................................17

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 3
4. Transport and storage .............................................................18
4.1 Scope of delivery ..............................................................................................18
4.2 Incoming goods inspection ..............................................................................18
4.3 Transport, packaging and storage...................................................................18
5. Installation ................................................................................20
5.1 Installation conditions.......................................................................................20
5.2 Before installation .............................................................................................20
5.3 Installation of butterfly valve ............................................................................ 20
5.4 Mounting the rotary actuator............................................................................ 22
5.5 Pressure test of the pipe section .....................................................................22
6. Commissioning and operation ................................................23
7. Maintenance and repair ...........................................................23
7.1 Maintenance of the actuator ............................................................................23
7.2 Maintenance of butterfly valve .........................................................................23
8. Troubleshooting .......................................................................23
9. Repair and spare parts ............................................................24
10. Disassembly .............................................................................25
10.1 Disassembly of the actuator.............................................................................25
10.2 Dismantling the butterfly valve from the pipeline............................................25
11. Disposal ....................................................................................25

4PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
12. EU Declaration of Incorporation Type P... .............................26
13. EU Declaration of Incorporation Type E... .............................27
14. EU Declaration of Conformity Type E... .................................28
15. Annex / Technical data ............................................................29
15.1 Technical data of rotary actuator .....................................................................29
15.2 Technical data of the shut-off valve Type ZDS ...............................................29
15.3 Dimensional tables and dimensional drawings Type PZDS with bar-agturn.30
15.3.1 Dimensional drawing Type PZDS with bar-agturn...............................30
15.3.2 Dimensional table Type PZDS with bar-agturn....................................32
15.3.3 Actuator assignment ............................................................................. 36
15.4 Dimensional tables and dimensional drawings Type PZDS with actubar......37
15.4.1 Dimensional drawing Type PZDS with actubar.................................... 37
15.4.2 Dimensional table PZDS with actubar..................................................39
15.4.3 Actuator assignment ............................................................................. 43
15.5 Dimensional tables and dimensional drawings Type EZDS ...........................44
15.5.1 Dimensional drawing Type EZDS ......................................................... 44
15.5.2 Dimensional table Type EZDS...............................................................45

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 5
1. General information
This operating manual is a part of the prod-
uct. The operating manual must be kept for
the entire life of the product and must be
passed on to each subsequent owner of the
product.
The operating manual must always be avail-
able at the place of operation.
1.1 Reference documents
This manual, the data mentioned and de-
sign data sheets, additional assembly and
maintenance instructions as well as further
information – also in other language ver-
sions, can be obtained from:
bar pneumatische
Steuerungssysteme GmbH
Auf der Hohl 1
53547 Dattenberg
Tel.: [phone]
Fax: [phone]
Email: [e-mail]
www.bar-gmbh.de
IMPORTANT
This manual is only valid in conjunction
with the manufacturer documentation of
the rotary actuator.
bar pneumatische
Steuerungssysteme GmbH
Auf der Hohl 1
53547 Dattenberg
Tel.: [phone]
Fax: [phone]
Email: [e-mail]
www.bar-gmbh.de
Valpes
Z.I. Centr‘alp
89 rue des étangs
F - 38430 Moirans
Tel. [phone]
Fax [phone]
[e-mail]
www.valpes.com
1.2 Validity of the operating
manual
This operating manual is valid for the 2/2-
way automatic butterfly valve of PZDS /
EZDS type since year of manufacture 2019
with one of the following rotary actuators:
bar-agturn
• agturn Type GD-032 till 040
• agturn Type GD/GS-052 till 400
actubar
• actubar Type AD-001
• actubar Type AD/AS-002 till 1200
Electric rotary actuator of company
Valpes

6PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
1.3 Notes to operating manual
The safety and hazard statements in the
document are intended for your protec-
tion, the protection of third parties and the
protection of the product. The instructions
must therefore be observed.
1.3.1 Signal words and symbols
DANGER
... indicates a hazard that, if not avoided,
will result in death or serious injury.
WARNING
... indicates a hazard that, if not avoided,
could result in death or serious injury.
CAUTION
... indicates a hazard which, if not avoid-
ed, could result in minor or moderate in-
jury.
NOTE
... indicates important information (e.g.
Material damage) but not hazards.
Electric voltage!
The text passages marked with
this symbol inform you about
dangerous situations with danger to life
and health of persons due to electrical
voltage.
Corrosive substances!
The text passages marked with
this symbol inform you about
dangerous situations caused by corrosive
substances.
Hot surface!
The text passages marked with
this symbol inform you about
dangerous situations with a risk of burns
due to hot surfaces.
Cold surface!
The text passages marked with
this symbol inform you about
dangerous situations with a risk due to
cold surfaces.
Suspended load!
The text passages marked with
this symbol inform you about
dangerous situations with a risks due to
suspended load.
Hand injuries!
The text passages marked with
this symbol inform you about
dangerous situations resulting in hand
injuries caused by bruising or punching.
The activities described in the relevant
text passage must be performed with the
utmost care to avoid dangerous situations
and resulting injuries such as loss of limbs.

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 7
Use head protection!
Notes with this symbol indicate
that a head protection must be
worn.
Use protective clothing!
Notes with this symbol indicate
that a protective clothing must
be worn.
Use hand protection!
Notes with this symbol indicate
that a hand protection must be
worn.
1.3.2 Explanation of the structure of
the safety instructions
A safety instruction is initiated with a signal
word describing the severity of the danger
(
„Chapter 1.3.1 Signal words and symbols“ ).
WARNING
Type or source of danger (possibly
with warning signs according to DIN
EN ISO 7010)
Consequences in case of not following
the instruction
• Avoidance of danger
1.3.3 Descriptions in figures
The figures in this operating manual are
intended to help you understand the facts
and procedures.
The descriptions in the figures are exem-
plary and may differ slightly from the actual
appearance of your product.
1.4 Responsibility of the operating company
• The installation, electrical and pneumatic connection as well as the commissioning of
the product may only be carried out by qualified personnel in accordance with the in-
structions described in this operating manual.
• The product may only be operated and maintained by personnel of the legal minimum
age and the corresponding personnel qualification.
• This operating manual is an integral part of the product and must be available to the
personnel at all times. This operating manual must be read and understood before the
first commissioning.
• The operating and technical personnel must be instructed about safety devices of the
product as well as safe working methods.
• The product may only be operated in perfect condition. No safety devices may be re-
moved or disconnected.

8PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
2. Safety
2.1 General Safety Instructions
Personnel assigned to work on the auto-
matic butterfly valve must read the operat-
ing instructions before starting work and, in
particular, understand the chapter “Safety”
before starting work. This is particularly valid
for personnel working only occasionally on
the rotary actuator.
2.2 Intended use
• The automatic butterfly valve is used
for the automatic shut-off of liquids and
gases in pipelines.
• The automatic valve is designed for use
in process engineering plants.
• The operating values, limit values and
setting data specified in the operating
manual and the corresponding data
sheet must be observed.
• Intended use also includes the obser-
vance of these operating instructions.
2.3 Reasonable foreseeable use
Any use other than that described in „Chap-
ter 2.2 Intended use“ and any use not ap-
proved by the manufacturer is considered
as unintended.
DANGER
Danger of explosion!
The automatic valve is not intended for
use in potentially explosive atmospheres.
• Do not use the automatic valve in po-
tentially explosive atmospheres.
2.4 Organizational measures
2.4.1 Subsequent retrofitting or
changes
The operator must make a corresponding
assessment of the hazards when dealing
with subsequently integrated components
and retrofitting.
If you want to use a different medium or use
the butterfly valve for a different purpose,
contact our customer service. We can help
you with any possible necessary configura-
tions.
2.4.2 Replacement of defective
parts
Replace parts of the rotary actuator that are
not in perfect condition immediately with
original spare parts.
Please note that only original spare and
wear parts of bar GmbH are to be used.
In the case of usage of the third-party parts,
it is not ensured that they are designed and
manufactured to suit the requirements.

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 9
2.5 Protective equipment
If necessary, the protective equipment shall
be used. Keep your hair and clothing away
from moving parts. If necessary, wear a
hairnet and do not wear jewelery such as
necklaces and rings!
Use head protection!
Wear suitable head protection
during transport.
Use protective clothing!
Wear suitable protective clothing
during commissioning, mainte-
nance and troubleshooting.
Use hand protection!
Wear suitable hand protection
during transport, commissioning,
maintenance and troubleshooting.
2.6 Personnel qualification
Only trained or instructed personnel who
has known and understood the operating
instructions as well as the possible dangers
of the rotary actuator is allowed to work with
the rotary actuator. The responsibility of the
personnel for operation, maintenance and
repair must be clearly defined by the oper-
ator.
Personnel to be trained, instructed or un-
dergoing training may work on the rotary
actuator only under the constant supervi-
sion of an experienced person.
The individual activities on the rotary actua-
tor require different personnel qualifications
which are listed in the following table. The
different qualifications are characterized by
the following skills and knowledge:
• Instructed persons must operate the rotary actuator and be able to detect possible
damage and dangers on the rotary actuator.
• Instructed persons with technical training must also be aware of the dangers of han-
dling pressurized equipment, hot and cold surfaces, harmful and hazardous materials
and the process of installing and removing the valves in a process line, the specific and
potential risks of the process and the most important safety regulations.
• Trained electricians must read and understand electrical circuit diagrams, commission,
put electric machines into operation, service and maintain them, wire switch and control
cabinets, install control software, ensure the functionality of electrical components and
identify potential hazards in handling electrical and electronic systems.
• Trained pneumatic specialists must read and understand pneumatic circuit diagrams,
put pneumatic systems into operation, service and maintain them, disconnect and
connect pneumatic hoses, ensure the proper functioning of pneumatic components,
assess the work performed on the pneumatic system and identify potential hazards.

10 PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
Read this table as follows:
“The electrical installation requires the qualification of a qualified electrician.”
Activities Instructed
persons
Instructed persons with
technical training
Electri-
cians
Pneumatic
specialists
Installation X
Electrical installation X
Pneumatic installation X
Setting and equipping X
Commissioning X
Troubleshooting X
Cleaning X
Troubleshooting, repair and
maintenance of mechanics X
Troubleshooting, repair and
maintenance of electrics X
Troubleshooting, repair and
maintenance of pneumatics X
Functional checks X
Shutdown X X
Transport X
Disposal X
Tab. 2-1 Overview of the required personnel qualifications

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 11
2.7 Dangers when handling the
automatic butterfly valve
This product of bar GmbH is built according
to the state of the art and the recognized
safety rules. Nevertheless, there remains a
residual risk and may cause dangers to the
life and limb of the user or third parties or
impairments of the product and other mate-
rial assets in use, if:
• the product is not used as intended,
• the product is operated or repaired by
untrained personnel,
• the product is improperly changed or
modified and/or
• the safety instructions are not observed.
Eliminate faults that may affect safety.
2.7.1 Dangers during assembly,
maintenance and disassembly
DANGER
Electric voltage!
There is danger to life when work-
ing on electrical components.
• The electrical connections may be
performed only by qualified electri-
cians.
• When working on the components,
have the voltage released by a qual-
ified electrician and secured against
being switched on again.
• Let a qualified electrician check that
no current is present.
DANGER
Corrosive substances!
Depending on the type of medi-
um, there may be danger to life
when in contact with the medium.
• Check the properties of the medium.
• Protect yourself and your environment
from harmful or toxic substances.
• Follow the safety instructions in the
manufacturer's safety data sheets.
• Make sure that no medium can get
into the pipeline, valves during assem-
bly work.
• Make sure that personnel working
with the valves and installing or repair-
ing the valves have received appropri-
ate training.
WARNING
Very cold and hot surfaces!
The body of the valve can be-
come very cold or very hot dur-
ing operation.
• Wear protective gloves
and protective clothing to protect
against frostbite or burns.
• Make sure that personnel working
with the valves and installing or repair-
ing the valves have received appropri-
ate training.

12 PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
WARNING
Danger of crushing hands
and other body parts!
There is a risk of injury during as-
sembly/disassembly by movements of the
ball. The shut-off body (e.g. ball or disc) of
the valve works as a separating element.
It makes no difference whether a rotary
actuator is mounted or not. The position
of the ball may change during transport or
handling of the valve.
• Keep hands and fingers away when
power is connected.
• Always disconnect the power supply
from the rotary actuator before carry-
ing out maintenance and repair work
on the valve and when installing and
removing the ball valve from the pipe-
line.
• Pay attention to movements of the
ball.
• Keep hands, other body parts, tools
and other objects out of the swivel
range of the ball. Do not leave any for-
eign objects inside the pipeline.
• Perform works carefully when assem-
bling, disassembling and sampling.
WARNING
Flying parts!
Splashing medium!
There is a risk of injury when the valve is
removed under pressure or with present
medium. The disassembly or removal of a
pressurised valve causes an uncontrolled
pressure drop.
• Do not disassemble or remove the
valve from the pipeline as long as the
valve is pressurized.
• Always isolate the respective valve in
the piping system.
• Depressurise the valve and remove
the medium before working on the
valve and the rotary actuator.
WARNING
Ejected parts!
(only for pneumatic actuator)
When adjusting the rotary actuators and
when the rotary actuator is opened un-
der pressure, there is a risk of parts being
ejected!
• Always disconnect the compressed
air supply before maintenance, disas-
sembly and repair!
• Never set the mechanical end posi-
tions on the actuator as long as there
is pressure on connection 2 or 4.
• Never dismount the threaded pins of
the vacotrol interface under pressure
(only for actubar).
• Make sure the pinion of the rotary ac-
tuator is moving in the correct direc-
tion.

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 13
WARNING
Uncontrolled start-ups!
(only for pneumatic actuator)
There is a risk of injury if pneumatic rotary
actuators create a very high torque during
actuation or by spring force.
• Secure the rotary actuator against any
unintentional start-up or unexpected
spinning.
• Work on the pneumatic rotary actua-
tors in a prudent way.
• In case of single-acting rotary actua-
tors (type GS), make sure that the ro-
tary actuator is in the home position
(relaxed springs) when disassembling.
CAUTION
Hand injuries!
When mounting the rotary actuator on
the valve spindle, the rotary actuator is
pushed to the connection point/flange of
the valve.
When disassembling the rotary actuator
or removing the rotary actuator from the
valve spindle, the parts can slip down.
There is danger of crushing the hands!
• Carefully pull off the rotary actuator.
• Keep fingers and hands away from
the connection point.
NOTE
Material damage to valve spindle!
Material damage can occur if you use
built-on rotary actuators as levers.
• Do not use built-on actuators as le-
vers as they could damage the actua-
tor and the valve.

14 PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
2.7.2 Dangers during functional
checks, commissioning and
operation
DANGER
Bursting parts!
Escaping media!
There is danger to life if the maximum per-
missible pressure and temperature ranges
of the valve are insufficient for the operat-
ing conditions of the system. There is a
risk of injury and the risk of material dam-
age by wrongly selected materials.
In addition, there is a risk of damage to
the piping system.
• Only use the valves that are designed
for the operating conditions.
• Make sure that the selected materi-
als of the parts of the valve coming in
contact with the medium are suitable
for the media used.
DANGER
Escaping medium!
There is a risk of death
from escaping medium
as a result of leaks (scalding,
hazardous substances).
• Protect yourself from thermal or
chemical burns.
• Leave the danger area in case of leak-
age and keep third persons out of the
danger zone. Use appropriate barriers
or name supervisors.
WARNING
Danger of being pulled in,
danger of crushing and
locking!
Danger due to moving parts of the ma-
chine/valve which can be accessed
through assembly, disassembly, remov-
able covers at openings for functional
checks, sampling, etc. and through auto-
matically operated valves.
• Keep hands and fingers away when
compressed air or power is connect-
ed.
• Please note that single-acting rotary
actuators can move the valve to the
"open" or "closed" position when
closing or disconnecting the com-
pressed air supply (only for pneumatic
actuator).
• Perform works carefully when com-
missioning, making functional checks
and sampling.
WARNING
Risk of burns!
Devices and system components
can become very hot during op-
eration.
• Wear protective gloves and protective
clothing to protect against burns.
• At operating temperatures > 65°C a
short contact (approx. 1s) of the skin
with the surface of the machine/valve
may cause burns (DIN EN ISO 13732-
1).

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 15
• At operating temperatures = 60 °C a
long contact (approx. 3s) of the skin
with the surface of the machine/valve
may cause burns (DIN EN ISO 13732-
1).
• At operating temperatures
55 °C – 60 °C a long contact (approx.
3S to 10s) of the skin with the sur-
face of the machine/valve may cause
burns (DIN EN ISO 13732-1)..
CAUTION
Self-loosing components!
Components and fasteners may become
loose if not properly installed.
• Observe the information on tightening
torques in this operating manual.
• Check the tightening torque of screw
connections and tighten with the
torque wrench, if necessary.
CAUTION
Noise!
(only for pneumatic actuator)
When venting the pneumatic rotary actua-
tor, noise can be hazardous to health.
• Use silencer at vent port or take other
personal protection measures.

16 PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
3. Product description
The 2/2-way automatic butterfly valve of
PZDS/EZDS type is a combination of the fol-
lowing components:
• Butterfly valve of Sylax type
and one of the following rotary actuators
(according to order):
PKI (pneumatic)
• agturn Type GD-032 till 040 and
Type GD/GS-052 till 400
• actubar Type AD-001 and
Type AD/AS-002 till 1200
EKI (electric)
• electric rotary actuator of company
Valpes
The valve is operated pneumatically (dou-
ble- and single-acting) or electrically and is
characterized by a long service life and high
operational safety.
Product features:
• Conformity Directive 97/23/CE PED
• Conformity Directive 94/9/CE ATEX
• Checking tightness acc. EN12266-1
• Checking antistatic acc. EN12266-2
• Very good force transmission due to
robust multiple toothing between shaft
and valve disc
• Easy maintenance and anti-blowout
shaft due to circlip
• Disc and collar are replaceable
• Shaft and housing without contact to
medium
• Self-lubricating bearing bushes
• Anti-blowout spindle
• Usage also with vacuum and high flow
velocities
• Alternatively also can be delivered with
detent lever or gearbox.
3.1 Butterfly valve
The butterfly valve of Sylax type is intended for installation in piping systems. Its function is
to shut off or regulate a medium in pipelines.
3.2 Rotary actuator
The rotary actuator is used for the automatic actuation of industrial valves continuously
moving between the end positions.

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 17
3.3 Type plate
The type plate of the automatic valve is attached to the rotary actuator.
Fig. 3-1 Type plates PZDS
Fig. 3-2 Typen plate EZDS
Legend
1 bar article number
2 Article/order designation (see data sheet)
3 Control pressure range for the pneum. rotary actuator
4 Manufacture date (year of construction)
5 Electric voltage
6 Protection type
1
1
5
2
2
6
34
4

18 PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
4.3 Transport, packaging and
storage
DANGER
Suspended load!
When transporting, e.g. with a
crane, there is is a risk that parts
fall down and people are seriously injured.
• Never exceed the permissible load of
the hoisting equipment used.
• Use only suitable, approved and un-
damaged lifting slings for transport.
• If you attach lifting slings to the actu-
ator, they must be designed for the
entire actuator.
• Connect the slings so that the prod-
ucts can not be damaged.
• Exercise the utmost care when han-
dling and balancing the load.
• Perform the works with constant eye
contact with the load.
• Do not stay under or near the lifted
load.
• Keep third persons out of the dan-
ger zone. Use appropriate barriers or
name supervisors.
4. Transport and
storage
4.1 Scope of delivery
• 2/2-way automatic butterfly valve of
PZDS/EZDS type
• Possibly ordered accessories
4.2 Incoming goods inspection
The following items must be checked at the
time of delivery:
• Does the number of delivered transport
containers correspond to the delivery
note?
• Is the packaging free of visible damage?
• Are the product and accessories free of
visible damages?
• Are there any evidences of not gen-
tle handling during the transport (e.g.,
burns, scratches, colour)?
To have all the right for claim against the
transport company, you have to document
the possible external transport damages
(e.g. with photographs and a written proto-
col) before unpacking the product.
bar GmbH is not responsible for transport
damages and can take over no liability for
that.

PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0 19
NOTE
Lifting slings are factory-fitted for dimen-
sions with high weights. They are de-
signed exclusively for the weight of the
actuator and must not be used for lifting
the automatic valve!
The products must be handled, transported
and stored with care:
• There is no liability of the manufacturer
for transport within the customer's ter-
ritory or to the individual places of use.
• The products should be transported in
their original packaging or on a pallet (or
similarly supported) to the installation
site and unpacked immediately before
installation.
• When storing before installation, keep
the products in a closed room and pro-
tect them from harmful influences such
as dirt or moisture.
• The products must be stored in their
original packaging and, if necessary,
with the appropriate protective covers.
• In case of a longer storage period, the
pneumatic rotary actuator must be op-
erated at least once a year.
• Proper disposal of the packaging is the
responsibility of the customer.

20 PZDS/EZDS-IM-DE-B-EN-01-23 Rev.0
5. Installation
WARNING
Installation works
There is a risk of injury if this prod-
uct is not properly installed, disas-
sembled and put into operation.
• Make sure the personnel has received
the appropriate training.
• Observe the safety instructions in
„Chapter 2. Safety“ .
NOTE
Check the technical parameters, in par-
ticular pressure and temperature, and
the electrical voltage of the control valve
before installing or commissioning the ac-
tuator.
The piping system and control system must
be installed properly.
Make sure the valve is moving in the cor-
rect direction of rotation. Always mount
the valves into the pipeline without tensing
them.
The valve is not designed to absorb addi-
tional pipe connection forces. In the case of
large valves, it is recommended to support
the pipeline.
5.1 Installation conditions
The minimum space requirement can be
found in the dimension drawing or dimen-
sion table (
„Chapter 15. Annex / Technical
data“
).
5.2 Before installation
Observe the following points before instal-
lation:
• The dew point of the control medium
must be min. 10 °C lower than the low-
est operating temperature! The max.
temperature of the control medium is
45 °C!
For other valve types, in particular large-vol-
ume valves with low torque requirement, the
operating conditions of the actuator must
be agreed with the manufacturer. We will be
delighted to advise you.
5.3 Installation of butterfly valve
The flanges must already be welded in the
pipeline and sufficiently cooled.
Do not use flange gaskets or grease.
Note the following instructions for sin-
gle-acting actuators:
1. To install the butterfly valve in the pipe-
line, the respective actuator must be
disassembled in the safety position
(spring cl. = valve disc closed, spring op.
= valve disc opened).
2. Then manually move the butterfly valve
to a slightly open position and install it in
the pipeline.
3. After installing the butterfly valve in
the pipeline, bring it back manually to
the previous safety position and re-in-
stall the actuator on the butterfly valve.