DUKER 451, 4510 Series Operating Instructions Manual
Operating Instructions
Resilient Seated Butterfly Valves
Type 451 double flanged
for water/ gas (PN 10/ 16/ 25)
Item no. of the operating instructions: 764846 Issue 04, 2018, 19 pages
Specifications subject to change without notice
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1 Intended use 3
2 Safety precautions 3
2.1 General safety instructions 3
2.2 Safety instructions for the owner/operator 3
2.3 Special risks 4
3 Transport and storage 5
4 Pressure test on the pipeline 6
5 Installation into the pipeline 6
5.1 General information 6
5.2 Operational steps 7
6 Functional description 7
7 Drawing and parts list 8
7.1 Drawing 8
7.2 Part list 9
8 Operation 10
9 Troubleshooting 12
10 Service and maintenance 13
10.1 Maintenance 13
10.2 Replacing the profile sealing 13
10.3 Adjusting the retaining ring 16
10.4 Tightening torque gear flange 17
10.5 Tightening torque blind pin 18
10.6 Tightening torque retaining ring 18
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1 Intended use
After the installation into a pipeline, butterfly valves are only intended for stopping or allowing media to
pass within the range of the permitted operating conditions (temperature and pressure limit "PN" labeling on
the valve, unless stated otherwise).
These valves are preferably intended for liquid media, such as drinking water or gas. Any deviating operating conditions or areas of application are subject to manufacturer approval.
We will not assume any responsibility for consequential damage caused by
unauthorized modification of the valve and the accessories supplied
improper operating or operating conditions
acts of god
To control in continuous operation shut-off valves are not usable.
Cavitation is definitely to be avoided.
2 Safety precautions
2.1 General safety instructions
The safety regulations applicable to valves are the same as those for the pipeline in which they are installed.
These instructions only specify those safety instructions which have to be additionally noted and observed for
valves.
2.2 Safety instructions for the owner/operator
The owner/operator of the valve is responsible to ensure that the valve is only used as intended.
It is not in the responsibility of the manufacturer. Only competent persons, with suitable qualifications for
pressure pipes, operate and service the valve.
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Do not operate a valve whose permissible component operating pressure ("Ps") and maximum permissible operating temperature ("Ts") are not sufficient for the operating condition.
The area of application is marked on the valve.
Within the permissible operating temperatures, there is a risk of injury when working on the
piping components at temperatures below 10 ° C and above 40 ° C. Therefore, protective
measures should be taken in these cases.
Operating fluids must comply with the specification of the valve. The manufacturer assumes no
liability for corrosion damage caused by aggressive media. Failure to comply with this requirement can endanger life and limb and cause damage to the piping system.
The valve must be properly installed in the pipeline.
In the pipeline the usual flow velocities (e.g. according to EN 1074-1: 2.5 – 5 m/s for liquids must not
be exceeded in continuous service.
Abnormal operating conditions such as vibrations, water hammers, erosion, cavitation and greater
fractions of solids in the medium – especially wearing solids – must be clarified with the manufacturer.
2.3 Special risks
Before opening and/ or repairing valve, the pipe must be completely depressurized. The pipe
should be completely emptied before replacing wearing part
For valves used as an end fitting: In normal service a blank flange or a cover must be
mounted on the free pipe connection or the valve must be securely locked in the
"SHUT/CLOSED" position. Caution on closing such a valve: Beware of risk of crushing!
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3 Transport and storage
All valves must be carefully transported and stored.
The valves are fully enameled or powder-coated. The coatings are shock-sensitive and must
be protected against impact stress.
The gaskets are sensitive to light: Unpackaged valves may only be exposed to bright daylight
or ultraviolet light for a very short time. This is why the openings are sealed with protective
caps. Valves must be stored in darkened rooms, in their original packaging with the protective
caps.
In the event of storage over an extended period of time, the storage location should be frostprotected, cool, dry, dark and free of dust. Alternatively, the valves may also be packed in or-
The valve should be stored on a pallet or similar support and only transported with suitable tools such as
wide straps to its designated point of installation. Do not use chains!
der to fulfill these conditions.
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4 Pressure test on the pipeline
New installed pipelines should be carefully flushed first to wash out all foreign bodies.
Valve open: The test pressure may not exceed the value 1.5 x PN (see valve markings).
Valve closed: The test pressure may not exceed the value 1.1 x PN (see valve markings).
5 Installation into the pipeline
5.1 General information
Only original spare parts from the manufacturer may be installed.
The sealing surfaces of the flanges are designed for mating flanges with smooth sealing
strips, according EN 1092 or Stock Finish according to ANSI B 16.5. Other flange shapes
must be agreed with the manufacturer. Elastomer gaskets according to the DVGW Guidelines
W 270 are recommended, preference is to be given to flange seals with a metal core according to EN 1514 Part 1.
The same instructions apply to the installation of Düker butterfly valves in a pipe as for the
connection of pipe elements according to EN 1092 and BS standards. It is assumed that the
corresponding instructions are known and are followed. They are not part of these operating
instructions. The following installation instructions additionally apply to butterfly valves
In order to prevent electrochemical corrosion, the formation of potentials should be avoided
when installed in pipes made of non-corrosive steel. Especially in humid environments, which
lead to condensation on the valve, it is therefore advisable to electrically disconnect the flange
connection elements.
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