DUKER 304 Manual de usuario
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Operating instructions
Underground fire hydrants
Type 304/305
- based on EN 1074-6, EN 14339
- completely enamelled inside and outside
- one-piece body, made of ductile cast iron
- DVGW registrated
Type 304 with single obturator
Type 305 with double obturator
Item No. of the operating instructions : 765355_01, Issue 04.2017, 14 pages
Subject to change without notice
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1. Intended use
2. Safety precautions
2.1. General safety instructions
2.2. User safety instructions
2.3. Special risks
3. Transport and storage
4. Installation into the pipeline
5. Description
5.1. Protection against pressurised water
5.2. Technical characteristics
5.3. Flow values
5.4. Performances
5.5. Operation
6. Dimensions
7. Drawing and parts list
8. Dismantling of the obturator linkage
9. Assembling of the obturator linkage
10. Maintenance and trouble shooting
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1. Intended Use
After the installation into a pipe system, shut-off 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, process water, raw and
waste water. 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
Continuous operation of the valve in an intermediate position will lead to increased wear of the valve
or the subsequent pipe system up to total destruction and should therefore be avoided.
Cavitation can be identified among other things by:
Increased noise level
Crackling noise
Severe vibrations
Cavitation can be avoided by operating the valve only in fully OPENED or fully CLOSED position.
2. Safety Precautions
2.1. General safety instructions
The same safety regulations apply for valves as for the pipe system in which they are installed. The
following instructions only include additional safety instructions to be observed for valves.
2.2. User safety instructions
The operator of the valve must ensure that the valve is only used in accordance with the intended use.
This is not the responsibility of the manufacturer. The valve may only be operated by properly qualified
and trained staff. The operating manual and the corresponding safety instructions must be read
and understood.
It is prohibited to use any valves with a nominal pressure ("PN") and maximum admissible operating
temperature insufficient for the operating conditions.
The approved range is indicated on the valve.
Warning: Temperatures below 10°C and above 40°C during work on the pipeline parts involve the risk of
injury. Protective measures must be taken accordingly.
Operating media must correspond to the specification of the valve. The manufacturer does not
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assume any liability for damage resulting from corrosion caused by aggressive media. Neglect of these
regulations may result in imminent danger to life and health, and may cause damage to the pipeline.
The valve must be professionally installed into the pipeline.
Following EN 1074-1, the maximum flow velocity may not surpass 4 m/s in continuous
operation.
Operating conditions such as vibrations, water impact, erosion, cavitation and major
proportions of solid matter in the medium - especially of an abrasive nature – must be
clarified with the manufacturer prior to commissioning.
2.3. Special risks
Be sure to free the pipeline from any pressure and risk prior to disassembly, maintenance and repair of
the valve. During disassembly the medium may leak, therefore the pipeline and the valve must be
completely emptied.
The energy supply must be switched off.
For valves that are used as end valves, the free connection must be shut off or the valve locked securely
in the position "shut". Danger of Crushing!
3. Transport and storage
All valves must be carefully transported and stored.
The valves are fully enamelled 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 frost-protected,
cool, dry, dark and free of dust. Alternatively, the valves may also be packed in order to fulfill these
conditions.
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!
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4. Installation into the pipeline
For installation and operation of the hydrants consider the DVGW Leaflet W 331!
When installing the hydrant with the factory-provided flange gasket, the flange bolts should be tightening
with a max. torque of 70 Nm.
5. Description
5.1. Protection against pressurised water
Düker hydrants series 304/305 are equipped with the proven, automatic working protection against
pressurised water.
When opening the hydrant (main obturator), the pressurised water will flow into the hydrant only after the
draining outlet of the hydrant is safely closed.
When closing the hydrant, the drainage outlet will only be re-opened after the main obturator is safely
closed.
This construction avoids the flow of pressurised water through the drainage outlet, and residual water
remaining in the hydrant can be drained without problems into the surrounding soil. In order to ensure a
permanently safe and unhindered drainage, we recommend the use of drainage packages.
5.2. Technical characteristics
The underground fire hydrants Type 304 / 305 are designed to supply a minimum flow of 110 m³ per hour,
at an internal pressure loss of 1 bar.
The maximum allowable water flow velocity is 4 m/ s.
The residual rest water is lower than 80 cm3.
Connecting flange: DN 80 according to EN 1092-2
Soil covers: 0.80 m – 1.00 m – 1.25 m – 1.50 m
Factory test pressure: 24 bar
If the hydrant Type 305 (with double obturator) is used for supplying water in the pipeline, the maximum
flow velocity should not surpass 0.5 m/s (150 l/min.)
5.3. Flow values
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5.4. Performances
Robust, one-piece obturator, completely covered with high grade Polyurethane elastomer.
Obturator designed in flow-optimized shape.
Automatic draining and protection against pressurised water safely guaranteed by inside enamelling
Stem bearing maintenance-free by use of 2 O-Rings.
Stem thread produced by rolling process, therefore highest protection against wear and tear.
Protection during replacement of the obturator linkage by integral linkage locking device.
5.5. Operation
The hydrant will be closed by turning the stem in clockwise direction, actuation anti-clockwise opens the
hydrant. To open the hydrant fully, approx. 9 turns are necessary. Due to the fact that the obturator acts
radially, absolutely tight sealing can be achieved with low effort.
When open or closing the hydrant, always turn the stem to the perceptible contact of the
mechanical end stops. The maximum operation torque MOT up to 105 Nm is valid for both
directions of rotation. If the max. torques are reached without satisfying closing or opening,
the application of higher torques will not achieve a better tightness of the obturator and can
lead to a destruction of the coating of the end stops or the stem drive.
=> Throttling or intermediate positions of the obturator during water flow are not allowed!
To avoid to high pressure in the upper column, the hydrant should not be closed as long the valves of the
standpipe are closed.
Automatical draining:
The outlet of the automatical draining is opened, when the hydrant is closed. The complete draining of the
hydrant will be carried out within a drainage time of 2 – 3 minutes, depending on the column length (soil
cover) and the water absorbing capacity of the surrounding soil. (EN 1074-6: max. 10 minutes)
Protection against pressurised water:
When opening the hydrant (approx. 2 turns), at first the drainage outlet will be closed against the
pressurised water, due to the design of the obturator.
Further opening (approx. 1 turn) will open the water flow.
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6. Dimensions
Surface
box
DIN 4055
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7. Drawings and part list
7.1. Drawing
Este manual sirve para los siguientes modelos
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