Mankenberg DM 152V Installation instructions

Original operating manual
Pressure reducing valve
Originalbetriebsanleitung
Druckminderventil
DM 152V
DM 152V-4.X.231 Stand 14.04.2023 Made in Germany

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DM 152V-4.X.231 Stand 14.04.2023 Made in Germany
Table of contents EN
1 Intended use ............................................................................................................................................... 6
1.1 Area of application ............................................................................................................................... 6
1.2 Reasonably predictable misuse ........................................................................................................... 6
1.3 Changes and modifications.................................................................................................................. 6
1.4 Declaration of conformity ..................................................................................................................... 6
2 Safety........................................................................................................................................................... 7
2.1 Explanation of warning notices ............................................................................................................ 7
2.2 Protection ............................................................................................................................................. 7
2.3 Personnel qualification ......................................................................................................................... 8
2.4 Personal protective equipment............................................................................................................. 8
2.5 Structural modification.......................................................................................................................... 8
3 General notes ............................................................................................................................................. 9
3.1 Warranty and Liability........................................................................................................................... 9
3.2 Standards and guidelines applied ........................................................................................................ 9
3.3 Duties of the operator........................................................................................................................... 9
4 Applied standards and directives............................................................................................................. 9
5 General view ............................................................................................................................................... 10
6 Nameplate ................................................................................................................................................... 11
7 Transport, handling and storage .............................................................................................................. 11
7.1 Transport.............................................................................................................................................. 11
7.1.1 Transport conditions ................................................................................................................. 12
7.2 Storage................................................................................................................................................. 12
7.2.1 Storage period .......................................................................................................................... 12
7.2.2 Storage conditions .................................................................................................................... 12
8 Installation and commissioning................................................................................................................ 12
8.1 Plant requirements ............................................................................................................................... 12
8.1.1 Plant structure........................................................................................................................... 12
8.1.2 Application example.................................................................................................................. 13
8.1.3 Leakage rate ............................................................................................................................. 14
8.1.4 Nozzle loads ............................................................................................................................. 14
8.2 Installation ............................................................................................................................................ 16
8.2.1 Installation position ................................................................................................................... 16
8.2.2 Preparation ............................................................................................................................... 16
8.2.3 Procedure ................................................................................................................................. 16
8.2.4 Further information.................................................................................................................... 17
8.3 Pressure resistance test....................................................................................................................... 17
8.3.1 Testing the system's pressure resistance................................................................................. 17
8.3.2 Tightness test of the valve ........................................................................................................ 17
8.4 Commissioning and setting the operating point ................................................................................... 18
8.4.1 Preparation ............................................................................................................................... 18
8.4.2 Procedure ................................................................................................................................. 19
8.4.3 Subsequent work ...................................................................................................................... 19
8.5 Checking the set outlet pressure.......................................................................................................... 19
8.5.1 Preparation ............................................................................................................................... 19
8.5.2 Procedure ................................................................................................................................. 19
8.5.3 Final activities ........................................................................................................................... 19

9 Operation .................................................................................................................................................... 20
10 Maintenance................................................................................................................................................ 21
10.1 Maintenance schedule ......................................................................................................................... 21
10.1.1 Further information.................................................................................................................... 21
10.2 Replace of the maintenance kit............................................................................................................ 21
10.2.1 Required tools / material ........................................................................................................... 21
10.2.2 Starting point / preparatory activities......................................................................................... 21
10.2.3 Disassembly of spring module and inlet connection................................................................. 22
10.2.4 Disassembly of control module ................................................................................................. 22
10.2.5 Maintenance of the stem........................................................................................................... 23
10.2.6 Assembly of the control module................................................................................................ 23
10.2.7 Assembly of spring module and connecting piece.................................................................... 24
10.2.8 Final activities ........................................................................................................................... 24
10.3 Torques ................................................................................................................................................ 25
10.4 Lubrication schedule ............................................................................................................................ 26
10.5 Spare parts and wearing parts ............................................................................................................. 27
10.5.1 Contact...................................................................................................................................... 27
10.5.2 Sending in the valve.................................................................................................................. 27
11 Error search, troubleshooting and repair ................................................................................................ 28
11.1 Malfunctions ......................................................................................................................................... 28
11.1.1 Help in case of malfunctions ..................................................................................................... 28
12 Decommissioning, dismantling and disposal ......................................................................................... 28
12.1 Decommissioning................................................................................................................................. 28
12.1.1 Preparation ............................................................................................................................... 29
12.1.2 Procedure ................................................................................................................................. 29
12.1.3 Subsequent activities ................................................................................................................ 29
12.2 Disassembly......................................................................................................................................... 29
12.2.1 Preparation ............................................................................................................................... 30
12.2.2 Procedure ................................................................................................................................. 30
12.3 Disposal ............................................................................................................................................... 30
13 Cleaning ...................................................................................................................................................... 30
13.1 External cleaning.................................................................................................................................. 30
13.2 CIP/SIP cleaning .................................................................................................................................. 31
13.2.1 Required tools........................................................................................................................... 31
13.2.2 Preparation ............................................................................................................................... 31
13.2.3 Procedure ................................................................................................................................. 32
13.2.4 Concluding activity .................................................................................................................... 32
14 Inspection and testing ............................................................................................................................... 32
14.1 Test plan .............................................................................................................................................. 32
14.1.1 Corrosion .................................................................................................................................. 32
14.1.2 Leakage .................................................................................................................................... 32
14.1.3 Damage and deformation ......................................................................................................... 33
14.1.4 Checking the set outlet pressure .............................................................................................. 33
15 Information on REACH and RoHS ............................................................................................................ 35
15.1 Declaration on the REACH Regulation 1907/2006 .............................................................................. 35
15.2 Declaration on the RoHS Directive 2011/65/EU .................................................................................. 35
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DM 152V-4.X.231 Stand 14.04.2023 Made in Germany

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DM 152V-4.X.231 Stand 14.04.2023 Made in Germany
Inhaltsverzeichnis DE
1 Bestimmungsgemäße Verwendung ......................................................................................................... 36
1.1 Einsatzbereich...................................................................................................................................... 36
1.2 Vernünftigerweise vorhersehbare Fehlanwendung.............................................................................. 36
1.3 Veränderungen und Modifikationen ..................................................................................................... 36
1.4 Konformitätserklärung .......................................................................................................................... 36
2 Sicherheit.................................................................................................................................................... 37
2.1 Erläuterung der Warnhinweise............................................................................................................. 37
2.2 Schutz .................................................................................................................................................. 37
2.3 Personalqualifikation ............................................................................................................................ 38
2.4 Persönliche Schutzausrüstung............................................................................................................. 38
2.5 Bauliche Veränderung.......................................................................................................................... 38
3 Allgemein .................................................................................................................................................... 39
3.1 Gewährleistung und Haftung................................................................................................................ 39
3.2 Verwendete Normen und Richtlinien.................................................................................................... 39
3.3 Betreiberpflichten ................................................................................................................................. 39
4 Angewandte Normen und Richtlinien ...................................................................................................... 39
5 Übersicht..................................................................................................................................................... 40
6 Typenschild ................................................................................................................................................ 41
7 Transport, Handhabung und Lagerung.................................................................................................... 41
7.1 Transport.............................................................................................................................................. 41
7.1.1 Transportbedingungen.............................................................................................................. 42
7.2 Lagerung .............................................................................................................................................. 42
7.2.1 Lagerungsdauer........................................................................................................................ 42
7.2.2 Lagerungsbedingungen ............................................................................................................ 42
8 Einbau und Inbetriebnahme...................................................................................................................... 42
8.1 Anlagenvoraussetzungen..................................................................................................................... 42
8.1.1 Anlagenaufbau.......................................................................................................................... 42
8.1.2 Anwendungsbeispiel ................................................................................................................. 43
8.1.3 Leckagerate .............................................................................................................................. 44
8.1.4 Stutzenlasten ............................................................................................................................ 44
8.2 Einbau .................................................................................................................................................. 46
8.2.1 Einbaulage ................................................................................................................................ 46
8.2.2 Vorbereitung ............................................................................................................................. 46
8.2.3 Vorgehensweise ....................................................................................................................... 47
8.2.4 Weiterführende Informationen .................................................................................................. 47
8.3 Druckfestigkeitsprüfung........................................................................................................................ 47
8.3.1 Druckfestigkeitsprüfung der Anlage.......................................................................................... 47
8.3.2 Dichtheitsprüfung der Armatur .................................................................................................. 47
8.4 Inbetriebnahme und Betriebspunkt einstellen ...................................................................................... 49
8.4.1 Vorbereitung ............................................................................................................................. 49
8.4.2 Vorgehensweise ....................................................................................................................... 49
8.4.3 Anschließende Tätigkeiten........................................................................................................ 49
8.5 Eingestellten Hinterdruck prüfen .......................................................................................................... 49
8.5.1 Vorbereitung ............................................................................................................................. 49
8.5.2 Vorgehensweise ....................................................................................................................... 50
8.5.3 Abschließende Tätigkeit............................................................................................................ 50

9 Betrieb......................................................................................................................................................... 50
10 Wartung....................................................................................................................................................... 51
10.1 Wartungsplan ....................................................................................................................................... 51
10.1.1 Weiterführende Informationen .................................................................................................. 51
10.2 Austausch des Wartungssatzes........................................................................................................... 52
10.2.1 Benötigtes Werkzeug / Material ................................................................................................ 52
10.2.2 Ausgangslage / vorbereitende Tätigkeiten................................................................................ 52
10.2.3 Demontage Federmodul und Eingangsstutzen......................................................................... 53
10.2.4 Demontage Steuermodul .......................................................................................................... 53
10.2.5 Wartung Spindel ....................................................................................................................... 54
10.2.6 Montage Steuermodul............................................................................................................... 54
10.2.7 Montage Federmodul und Anschlussstutzen............................................................................ 55
10.2.8 Abschließende Tätigkeit............................................................................................................ 55
10.3 Drehmomente ...................................................................................................................................... 56
10.4 Schmierplan ......................................................................................................................................... 57
10.5 Ersatz- und Verschleißteile .................................................................................................................. 58
10.5.1 Kontakt...................................................................................................................................... 58
10.5.2 Armatur einsenden.................................................................................................................... 58
11 Fehlersuche, Störungsbeseitigung und Reparatur................................................................................. 59
11.1 Störungen............................................................................................................................................. 59
11.1.1 Hilfe bei Störungen ................................................................................................................... 59
12 Außerbetriebnahme, Demontage und Entsorgung................................................................................. 59
12.1 Außerbetriebnahme ............................................................................................................................. 59
12.1.1 Vorbereitung ............................................................................................................................. 60
12.1.2 Vorgehensweise ....................................................................................................................... 60
12.1.3 Anschließende Tätigkeiten........................................................................................................ 60
12.2 Demontage........................................................................................................................................... 60
12.2.1 Vorbereitung ............................................................................................................................. 61
12.2.2 Vorgehensweise ....................................................................................................................... 61
12.3 Entsorgung........................................................................................................................................... 61
13 Reinigung.................................................................................................................................................... 61
13.1 Reinigung von außen ........................................................................................................................... 62
13.2 CIP/SIP-Reinigung ............................................................................................................................... 62
13.2.1 Benötigte Werkzeuge................................................................................................................ 62
13.2.2 Vorbereitung ............................................................................................................................. 63
13.2.3 Vorgehensweise ....................................................................................................................... 63
13.2.4 Abschließende Tätigkeit............................................................................................................ 63
14 Prüfen und Testen...................................................................................................................................... 63
14.1 Prüfplan................................................................................................................................................ 63
14.1.1 Korrosion................................................................................................................................... 63
14.1.2 Leckage .................................................................................................................................... 64
14.1.3 Beschädigung und Verformung ................................................................................................ 64
14.1.4 Eingestellten Hinterdruck prüfen............................................................................................... 65
15 REACH- und RoHS-Auskunft .................................................................................................................... 66
15.1 Erklärung zur REACH-Verordnung 1907/2006 .................................................................................... 66
15.2 Erklärung zur RoHS-Richtlinie 2011/65/EU ......................................................................................... 66
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DM 152V-4.X.231 Stand 14.04.2023 Made in Germany

Original operating manual
Pressure reducing valve DM 152V
6
DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
1 Intended use
The pressure reducing valve reduces the fluctuating higher inlet pressure of an operating medium to an
adjustable constant outlet pressure within a control deviation. The pressure reducing valve controls without
requiring any auxiliary energy, and it carries the operating medium without leakages.
The pressure reducing valve is vacuum-proof up to -1 bar.
The valve has been designed and built for the conditions specified in the order. The design criteria indicated on
the nameplate must correspond to the actual operating conditions. If the operating conditions or the application
change, the manufacturer Mankenberg must be consulted.
Use only maintenance kits and spare parts from the company Mankenberg!
1.1 Area of application
» The valve is intended for use in closed rooms (covered, heated and insect-free areas).
» Nominal diameter DN 15 - 25
» Pressure stages PN 16 / 6
» Temperature range -35 °C up to 130 °C
» Media: liquids, gases and steam
» Vacuum-proof also in SIP and CIP processes
» Leakage class: soft-sealing (leakage class V)
Temperatures above 50 °C entail a reduced pressure resistance. This must be considered for the corresponding
material as per the nameplate in accordance with the DIN EN 1092 standard. The pressure stage specification
refers to 20 °C.
1.2 Reasonably predictable misuse
The valve is not a safety valve, equipment part with a safety function or a shut-off device.
Additional loads must not be applied to the valve. For example, do not climb onto the installed valve or the
connected piping.
1.3 Changes and modifications
The supplied valve must not be modified or converted. Conversions are a safety risk and are carried out at the
operator‘s own risk.
1.4 Declaration of conformity
This product falls under Article 4 para. 3 of the 2014/68/EU Directive and therefore does not receive any CE
marking nor a declaration of conformity, it has been designed and manufactured in accordance with good
engineering practice applicable in Germany.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
2 Safety
2.1 Explanation of warning notices
Safety and warning notices denote safety-related information. The operating manual differentiates between the
following hazard levels.
DANGER
Fatal injuries
Denotes a hazardous situation. Failure to observe these warnings may result in serious
injuries or death.
WARNING
Serious injuries
Denotes a hazardous situation. Failure to observe these warnings may result in serious
injuries.
CAUTION
Injuries
Denotes a hazardous situation. Failure to observe these warnings may result in minor or
midrange injuries.
NOTICE
Material damage
Denotes warnings of material damage and includes precautionary measures for preventing
damage.
2.2 Protection
The valve does not have any special protective equipment, it is not fireproof and thus not designed for cases of
fire. In case of fire, the valve must be taken out of operation and must not be reused without having been
checked first for damage.
Since the valve is made of stainless steel, no corrosion allowance was used in the calculation.
Service life
The valve has been designed for an alternating load in accordance with AD 2000 S1-S2:
approx. 1000 start-up and shut-down processes (-1 bar or 0 bar to PS) permissible,
continuous load permissible at 10% of pressure variation from 0 to PS
WARNING
Warning against hot or cold surfaces
Risk of burns when touching hot or cold surfaces or leaking medium from the valve. The
surface of the valve can be hot or cold because of hot or cold medium! Wear personal
protective equipment, according to the medium: Skin or eye protection. Observe operator’s
safety measures.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
2.3 Personnel qualification
Only trained and instructed specialist personnel may work with the valve.
These personnel must:
» be familiar with the valid accident prevention regulations,
» have read and understood the operating manual,
» adhere to the safety instructions provided in the operating manual.
Untrained specialist personnel is trained by an experienced person. Transport, storage, commissioning,
maintenance and upkeep must be carried out exclusively by qualified and trained specialist personnel.
2.4 Personal protective equipment
Protective clothing, protective shoes, protective gloves and eye protection when using hot, cold, aggressive or
corrosive media. Protective gloves during assembly, disassembly and maintenance.
2.5 Structural modification
Structural modifications to the entire scope of delivery may impair the safety of the product. For this reason,
structural modifications are impermissible and must never be carried out without prior consultation with the
manufacturer.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
3 General notes
This operating manual is intended as instructions for using the valve safely. It is binding for transport, storage,
installation, commissioning, operation, maintenance and repair. Only work described in this operating manual
may be carried out.
Observe notes and warnings!
3.1 Warranty and Liability
Warranty and liability claims for personal injury and damage to property are excluded if they are attributable to
one of the following causes:
» Use other than the intended use
» Improper commissioning, operation and maintenance
» Failure to observe the warnings
» Unauthorized changes
3.2 Standards and guidelines applied
The product has been designed, manufactured, tested, labelled and documented in accordance with the
European Pressure Equipment Directive (DGRL) 2014/68/EU classification as per art. 4 para. 3 in accordance
with „good engineering practice“ and AD 2000.
In addition, the following standards and guidelines were applied: ASME BPE, EHEDG, 3A standard as well as
the Machinery Directive 2006/42/EG Part 2: Hygiene and cleanability requirements.
3.3 Duties of the operator
The operator is responsible for ensuring compliance with safety measures as well as for proper maintenance.
The operator must ensure that:
» the intended use is guaranteed at all times;
» the system prerequisites are fulfilled;
» a faultless, functional condition of the product prevails;
» the operating manual is available to the personnel;
» the personnel is qualified and equipped with the corresponding protective equipment;
» the compatibility between the medium and the valve and seal materials is ensured;
» Safe handling of the operating medium is ensured (e.g. hazards from contamination, moisture).
4 Applied standards and directives
The indicated product is designed according to the AD 2000 regulations without the data sheets S1 and S2.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
5 General view
2
1
4
4
5
3
7
6
1 Body with outlet opening 2 Inlet opening
3 Bonnet 4 Hygiene clamp
5 SIP/CIP screw 6 Lock nut
7 Leakage indicator
SIP/CIP screw
The SIP/CIP screw is provided with a marking indicating the condition of the screw:
Position of the SIP/CIP screw Marking the SIP/CIP screw Operating condition
completely open visible ready for operation
closed hand tight invisible SIP/CIP mode
Leakage indicator
If medium escapes at the leakage indicator, the diaphragm is leaking. In this case, the valve should be taken out
of service and undergo maintenance.
The leakage indicator is provided with a plug that seals the valve during external cleaning.
Lock nut
secures the CIP/SIP screw and is provided with a scraper ring. It seals against the SIP/CIP screw and protects
the bonnet, adjusting screw and diaphragm against external contamination.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
6 Nameplate
1
2
3
4
5
6
7
8
9
10
11
12
13
1 Order number 8 Serial number
2 Article number 9 Date, month, year of production
3 Type designation 10 Nominal diameter DN
4 Setting range 11 Material number
5 Maximum permissible pressure PS /
temperature min / max
12 Kvsvalue
6 Maximum permissible pressure PS /
temperature for steam
13 Flow direction
7 Production site
7 Transport, handling and storage
» The valve is usually not stable. Handle the valve carefully so that it does not tip over during transport or
storage.
» During transport and storage, protect the valve against external influences such as impacts, moisture and
dirt.
7.1 Transport
NOTICE
Qualified personnel required
Personnel must be trained to properly transport, secure, lift and lower the valve.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
Transport conditions
A crane can be used to make transport, installation and assembly easier. To do
so, proceed as follows:
1. Tighten locknut hand-tight.
2. Tighten the SIP/CIP screw to the marking.
3. Attach lifting equipment at the drilled hole.
NOTICE!Use lifting equipment with a sufficient load-bearing capacity.
7.2 Storage
NOTICE
Damage from corrosion due to incorrect storage or inadequate packaging
possible.
Ensure proper storage conditions and closed packaging. After a lengthy period of storage of
the valve, the complete maintenance kit must be replaced.
Storage period
All parts have a shelf life of 10 years, with the exception of elastomers.
The following criteria have an effect on the storage period:
» Storage conditions,
» Maintenance intervals - replace the maintenance kit after a lengthy storage period,
» Elastomers have a service life of approx. 1-5 years, depending on the elastomers used,
» Service life of the lubricants
Storage conditions
Storage temperature 15 to 25 °C.
Humidity normal/dry 40 to 60%.
NOTICE!Protect from rain, moisture, sunlight and aggressive media.
Store the valve in its packaging exclusively, using the original packaging if possible.
8 Installation and commissioning
The following chapter describes the installation and adjustment of the valve.
8.1 Plant requirements
The plant must meet the requirements for safe use of the product.
Plant structure
For safe operation of the valve in the plant, the basic requirements must be met. In the following chapter, a
functional structure is described in more detail. The layout is in the responsibility of the operator.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
Application example
1 Strainer 4 Safety valve
2 Shut-off valves 5 Pressure gauge
3 Pressure reducing valve 6 Bypass for maintenance
Strainer
Optional, for fluids with particles.
Shut-off valves
Shut-off devices must be provided upstream and downstream of the pressure reducing valve for installation,
maintenance and tight system closure. When closing the shut-off devices, the valve upstream of the pressure
reducing valve must always be closed first. A bypass may be necessary for emergency operation.
Pressure reducing valve
The pressure reducing valve reduces the fluctuating higher inlet pressure of an operating medium to an
adjustable constant outlet pressure within a control deviation Pressure reducing valves are not shut-off devices
which ensure a tight valve closure.
Safety valve
For safety reasons, a safety valve must be installed on the outlet pressure side of the valve. It is dimensioned
and adjusted so that the maximum permissible outlet pressure (MAWP outlet) of the valve is not exceeded, see
nameplate.
Pressure gauge
A pressure gauge must be installed downstream of the pressure reducing valve in order to start up and adjust
the pressure reducing valve and to check whether the pressure reducing valve is depressurized.
Bypass for maintenance
For emergency operation or pressure tests in the plant, or for maintenance of the valve, a bypass is
recommended.
Draining
A draining device must be provided on the inlet and outlet pressure sides by the customer. The draining device
must be secured against unauthorized opening.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
Leakage rate
Leakage class V, soft sealing cones = 1.8 x 10-5 x Δp x D** [l/h]
* KVSvalue, see nameplate
**D = seat diameter 17.2 mm
Nozzle loads
The forces and moments from the table of nozzle loads below are absorbed via the connections of the pipeline.
Forces and moments exceeding these values must be absorbed by other measures taken by the operator. The
support may only be provided at the connections and not at the body itself.
Specification of nozzle loads
My
Mx Fz
There are a maximum of six components of additional external loads: FX, FY, FZ, MX, MY, MZ.
Torsion is only significant for very large nozzle diameters and very small cylinder wall thickness. Lateral forces
are of secondary importance.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
Table of nozzle loads
Nozzle loads at TS +180°C
Nominal diameter DIN EN 11866 My [Nm] MX [Nm] FZ [N]
DN 15 Row A 25 20 115
DN 20 38.5 30.8 176.9
DN 25 55.6 44.4 255.6
DN 15 Row B 33.3 26.7 153.3
DN 20 55.6 44.4 255.6
DN 25 100 80 460
1/2 Row C 11.6 9.3 53.5
3/4 27.8 22.2 127.8
1 50 40 230

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
8.2 Installation
DANGER
Danger due to pressurized medium streaming out
Assembly work on system parts that are under pressure may lead to serious injuries.
Never carry out work on the valve unless the piping is depressurized. Rule out the possibility
of pressurization during this work. In cases of maintenance, installation and removal, the
piping must be emptied. Before starting work, perform a pressure compensation. Wear
personal protective equipment, protective gloves, safety eyewear and hearing protection.
NOTICE
Risk of material damage due to tensions, vibrations and oscillations.
Tensions, vibrations and oscillations during ongoing operation may cause damage to the
valve. The valve must be installed free of stress, vibrations and oscillations.
NOTICE
Qualified personnel required
Personnel must be trained to properly assemble and install the valve.
NOTICE
Assembly and disassembly should be performed by two persons.
Installation position
Position the bonnet upwards. The bonnet may be installed at an angle of up to 5° from the vertical.
Preparation
» The valve is depressurized. Valves that have been shut off are secured and labelled.
» Pipelines have been flushed and there are no foreign objects > 0.5 mm present in the system. Connections
on the system side are clean and flat.
» The packaging and yellow protective cap have been removed.
» The valve is clean and free of damage. If needed, blow out connecting pieces with clean compressed air.
»CAUTION!Do not install damaged valves! Contact the manufacturer, see section Contact [Page27].
» Interior parts of the valve are free of liquids (e.g. condensation water).
Procedure
Place the valve in the piping, align it and install it properly.
Observe the flow direction!
Install the valve with the bonnet facing upward!
NOTICE!To avoid restrictions due to lack of space when checking and adjusting the valve, allow at least
10 cm of space all around it.

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
Further information
» Nozzle loads
» Commissioning and setting the valve
8.3 Pressure resistance test
Testing the system's pressure resistance
NOTICE
There is a risk of material damage due to a system test with excessive
pressure.
For safety reasons, it is not permissible to test the pressure resistance of the system at the
customer's facility with the valve installed.
Carry out the pressure test using the bypass or replace the valve with a pipe during the
pressure test.
Tightness test of the valve
The pressure, seat tightness and function test of the valve has already been carried out by the manufacturer
Mankenberg prior to the delivery.
Depending on the type of medium, a suitable leak detection fluid must be used during the tightness test.
NOTICE
Risk of material damage due to excessive inlet pressure.
Excessive system pressure will damage the valve. Do not exceed the maximum inlet
pressure specified on the nameplate.
Preparation
» The pressure reducing valve has been installed.
» The plant was installed and adjusted according to the installation diagram.
» The safety valve is in operation and secures the outlet pressure side of the plant.
» The shut-off devices located upstream and downstream are closed.
Procedure

Original operating manual
Pressure reducing valve DM 152V
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DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
1 Strainer 4 Safety valve
2 Shut-off valves 5 Pressure gauge
3 Pressure reducing valve 6 Bypass for maintenance
DANGER!During the work, no persons other than the person carrying out the work are permitted to
remain in the danger zone.
1. Slowly open the shut-off valve (1) on the inlet side.
2. Pressurize the pressure reducing valve (3) and fill it with fluid through the inlet pipeline.
CAUTION!The data on the nameplate must not be exceeded.
3. Allow filling time to expire, approx.1 minute.
4. Flow sound should be audible for a short time.
5. Increase the inlet pressure on the plant side to the maximum value, inlet pressure stage PN, according to
the nameplate.
6. Set spring module to maximum adjustable outlet pressure according to nameplate:
– Turn the adjusting screw on the pressure reducing valve (3) several turns clockwise with an open-end
spanner, looking at the front of the adjusting screw, until the maximum adjustable outlet pressure is
indicated on the outlet pressure gauge (5).
– If the measured outlet pressure is higher than the max. adjustable outlet pressure:
Close upstream shut-off valve and then slowly open downstream shut-off valve (1) slightly to relieve the
excessively high trapped outlet pressure.
Then close the downstream shut-off valve (1) again.
Turn the adjusting screw counterclockwise until it can be safely assumed that the current outlet pressure
is below the maximum adjustable outlet pressure.
Now refill by opening the upstream shut-off valve, increase the inlet pressure, set the adjusting screw to
the maximum adjustable outlet pressure by turning it clockwise.
7. Increase the inlet pressure of the plant to the max. value indicated on the nameplate.
8. Allow the pressure reducing valve to remain under the inlet pressure for 3 minutes.
9. Check the pressure reducing valve for external leaks and pay attention to incessant flow sound inside.
If the pressure reducing valve is free of leaks, the leakage test is completed. If leaks are detected during
the leakage test, these defects must be remedied.
» The following applies to joints: Depressurize the pressure reducing valve, reseal the joint and tighten the
hexagon socket head screws with a tightening torque increased by approx. 10%.
» The following applies to the body wall or weld seams: Depressurize the pressure reducing valve, take it out
of service, remove it and contact the manufacturer.
8.4 Commissioning and setting the operating point
The operating point of the valve is not set in the delivery state, the valve does not operate. The pressure to be
controlled must be set via the adjusting screw.
Preparation
NOTICE
The operating point must be set under normal operating conditions, volume
flow and pressure, otherwise increased control deviations can be the result.
» The tightness test has been completed.
» The upstream-sided shut-off device is open.

Original operating manual
Pressure reducing valve DM 152V
19
DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
» The downstream-sided shut-off device is closed.
» In the delivery state, the spring is released.
» Remove the cleaning cap from the leakage indicator.
Procedure
1. Remove lock nut (10.5) and SIP/CIP screw (10.4) and keep the ball (10.3)
safely.
2. Slowly open the downstream-sided shut-off device.
3. Set the outlet pressure at necessary volume flow via the adjusting screw
(10.2).
Turning clockwise, looking at the front of the adjusting screw, increases
the outlet pressure to be controlled.
Turning counterclockwisereduces the outlet pressure to be controlled.
4. Check the outlet pressure to be controlled via the downstream-sided
pressure indicator.
1.2
1.4
10.4
10.5
10.3
10.2
Subsequent work
» Perform a visual function check, observe the stroke of the adjusting screw (10.2).
» Insert ball (10.3) and mount CIP screw (10.4) with lock nut (10.5). The marking of the CIP screw (10.4) is
visible above the lock nut.
8.5 Checking the set outlet pressure
Preparation
» The valve is in operation.
» The upstream- and downstream-sided shut-off devices are open.
» The test is performed at nominal volume flow.
Procedure
» Check at the downstream-sided pressure gauge whether the set outlet pressure is constant.
» If the outlet pressure is irregular, follow the recommendations in the error pattern table:
Cause Error pattern Remedy
Backpressure is not
controlled correctly
Consumption
downstream of the valve
varies strongly.
Re-establish normal operating conditions.
Re-adjust outlet pressure of the valve, see section
Installation and commissioning [Page12].
The valve was not
commissioned with the
operating data (volume
flow, pressure).
Re-adjust outlet pressure of the valve, see section
Installation and commissioning [Page12].
Too heavily fluctuating
inlet pressure
Check inlet pressure, reduce inlet pressure
fluctuations.
Final activities
» Install and adjust the valve correctly

Original operating manual
Pressure reducing valve DM 152V
20
DM 152V-4.X.231 Issue 14.04.2023 Made in Germany
9 Operation
After commissioning, a correctly designed and adjusted valve operates self-actingly within its setting range and
does not require any auxiliary energy.
WARNING
Warning against hot or cold surfaces
Risk of burns when touching hot or cold surfaces or leaking medium from the valve. The
surface of the valve can be hot or cold because of hot or cold medium! Wear personal
protective equipment, according to the medium: Skin or eye protection. Observe operator’s
safety measures.
NOTICE
Risk of material damage due to impermissible alternating load!
Up to N=1000 pressure cycling loads from 0 bar up to the nominal rated pressure rating (PN)
or maximum allowable outlet pressure (MAWP outlet, PS) are permissible. The pressure
span ≤ 10% of the respective nominal pressure rating (PN) or of the maximum allowable
outlet pressure (MAWP outlet; PS) may vary in pressure as often as desired.
NOTICE
Risk of material damage due to increased wear
Flashing and cavitation are inadmissible. In case of noise increase or volume flow decrease,
contact the manufacturer Mankenberg.
NOTICE
Risk of material damage caused by frost
Frozen liquids can cause unreliable control behavior, failure or damage to the valve.
If the valve is installed in rooms that are not frost-free, suitable measures must be taken
during plant shutdowns.
NOTICE
Risk of material damage due to inadmissible temperature impact
Damage to the valve caused by thermal stress and thermal shock. The heating rate must not
exceed 20 K/min. The temperature difference at the valve must not exceed 60 K.
CAUTION
Warning of noise during operation.
During operation, a noise level of > 85 dB may be produced.
Risk of hearing damage. Use personal protective equipment: Wear hearing protection.