MEDENUS R 51 Manual

© 05.2022
Gas Pressure Regulator
R 51
Operating and Maintenance Instructions

Subject to technical modifications! Reprint prohibited!

Diaphragm assembly
Actuator housing
Internal
measurement port
Adjusting screw
Spindle
Design of the gas pressure regulator R 51
Diaphragm

Table of Contents
1 General Information 6
1.1 Warranty and Liability 6
1.2 Symbols, Notes 7
1.3 Terms, Abbreviations 7
2 Application, Characteristics 8
2.1 Application 8
2.2 Characteristics 8
2.3 Types of Models (Options) 8
3 Avoidance of Foreseeable Misuse 8
4 Safety Instructions 9
4.1 Hazards of Handling the Device 9
4.2 Personnel Requirements 9
4.3 Country-Specific Requirements 9
4.4 Handover of the Operating and Maintenance Instructions 9
4.5 Safety in Operation 10
4.6 What to Do in Case of Danger 10
5 Responsibility of the Operator 10
6 Transport, Storage and Packaging 11
6.1 Transport 11
6.2 Storage 11
6.3 Packaging 11
7 Mounting and Commissioning 12
7.1 Safety Instructions and Preparation 12
7.2 Mounting 12
7.3 Leakage Test (Test for External Leakage) 14
7.4 Initial Commissioning / Recommissioning 15
7.6 Decommissioning 17
8 Maintenance 17
8.1 Maintenance Plan 17
8.2 Maintenance Procedure 18
8.3 Table of Screw Tightening Torques MA 18
8.4 Lubricants Table 18
Oxygen model 18
For oxygen models, a suitable grease which is approved for the use 18
with oxygen must be used. 18
9 Troubleshooting 19
9.1 Gas Pressure Regulator 19
10 Replacement and Disposal 20
11 Spare Parts 20
11.1 Parts for Maintenance Work 20
O-rings 20
Valve Plates / Diaphragms 20
11.2 Spare Part Sectional View R 51 21
Notes 22

12 Accessories / Options 23
12.1 BV breather valve 23
12.2 RSD restrictor valve 24
12.3 HD-2 version 25
13 Declaration of Conformity 26

6
© 05.2022
1 General Information
The personnel entrusted with installation, operation or maintenance of the gas pressure regulator must
have completely read and understood beforehand the following documents:
• Gas Pressure Regulator R 51 Product Information
The product information contains technical data, dimensions and a description of the design and the mode of
operation.
• Gas Pressure Regulator R 51 Operating and Maintenance Instructions
This document allows safe and efficient handling of the device and contains information on assembly,
commissioning, maintenance, troubleshooting, and repair according to regulations.
It is an integral part of the scope of delivery of the device, must be kept in close proximity of the device and
must be readily accessible to personnel at any time.
The basic prerequisite for safe working is compliance with all safety instructions and instructions for action
given in this manual. Accordingly, the information and instructions must be observed when working on the
device or on the gas line. In addition, the local occupational safety regulations and general safety regulations
for the application range of the device shall apply.
The figures in these instructions are provided for basic understanding and may differ from the actual design.
The contents of these instructions are protected by copyright. They may be used as part of operating the
device. Any other use and / or reproduction is not permitted without prior authorization by the MEDENUS©
Gas-Druckregeltechnik GmbH.
1.1 Warranty and Liability
Claims under warranty or liability for personal injury and material damage are generally void,
if one or several of the following conditions are not observed:
• Work on the device during the warranty period may only be performed in consultation with the manufacturer
• Designated use of the device in accordance with the established conditions of use
• Proper installation, commissioning, operation and maintenance of the device
• Operation of the device with properly installed and functioning safety devices only
• Operating and maintenance instructions of the device or of the system
• Compliance with the maintenance instructions
• Properly performed repairs
• Supply lines without defects
• The use of original MEDENUS©spare parts and lubricants listed in these instructions or
• Force majeure
It is generally prohibited
• To perform constructive modifications on the device
• To keep using the device despite the detection of a defect

7© 05.2022
1.3 Terms, Abbreviations
Terms and abbreviations are explained below:
1.2 Symbols, Notes
The instructions contain safety instructions marked with symbols to indicate possible consequences in case of non-
observance:
DANGER
Note
ATTENTION
This combination of symbol and signal word indicates a potentially hazardous
situation which, if not avoided, may result in minor or moderate injury, damage
to the device, the breakdown of the system, and material or environmental
damage.
This combination of symbol and signal word indicates an imminent hazardous
situation which, if not avoided, will result in death or serious injury.
This signal word highlights useful tips, recommendations, and information for
efficient and trouble-free operation.
ATC Acceptance test certificate
DN Nominal width
GPR Gas pressure regulator
MOP Maximum operating pressure
in a system
pdOutlet pressure
pds Setpoint of the
outlet pressure
SSV Safety shut-off valve
SRV Safety relief valve

8
© 05.2022
2 Application, Charac-
teristics
2.1 Application
Gas pressure regulator (GDR), direct-acting (operating without auxiliary power), for systems acc. to
DVGW work sheets G 491 (A) and G 600 (A) (TRGI)
Particularly suitable for dynamic regulation sections (e.g. natural gas supply systems,
low flow regulators, burner circuits, gas motor operation)
Can be used for the gases defined in DVGW work sheets G 260 / G 262 and neutral non-aggressive gases.
(other gases on request)
2.2Characteristics
 • Integralpressure-tightmodel(IS)
 • Diaphragmassemblywithinternalorexternalmeasuringline
• Open-airmodel
3 Avoidance of Foreseeable Misuse
2.3 Types of Models (Options)
 • Theregulatorsmustnotbeusedtocontrolliquids.
 • Theregulatorsmustnotbeusedintemperaturerangesbelow-20°Corabove60°C
 • Theregulatorsmustnotbeusedforpressurerangeshigherthanthepressure“PS“indicatedonthenameplate.
 • The regulators may only be used for the gases specified under item 2.1 Application in these operating
instructions.
Other gases, such as oxygen or hydrogen, must be explicitly stated on the nameplate.
Please consult the manufacturer before use.
 • Theregulatorsmustnotbeusedinhigh-temperatureareas(HTB)withoutanupstreamHTBfuse.
 • Oxygenmodel(pu≤10 bar)
 • WithBVbreathervalve
 • WithRSDthrottlevalve
 • Hydrogenversion

9© 05.2022
4 Safety Instructions
National accident prevention regulations and the system operator‘s safety regulations are not superseded by these
operating and maintenance instructions and must be taken into consideration with priority (in Germany, see, among
others, DVGW work sheets G 600, G 459/II, G 491 and G 495).
When performing work on the device, the current general and specific safety regulations must be observed.
The application limits of the device with respect to the medium, operating pressure and operating temperature can be
found on the nameplate affixed to the device or on the acceptance test certificate.
Using the device under different operating conditions must be agreed upon in consultation with
MEDENUS Gas-Druckregeltechnik GmbH.
The mechanical components of the device do not have any potential ignition sources of their own nor any hot surfaces
and are thus not covered by the scope of 2014/34/EU (ATEX). The electronic accessories used comply with the ATEX
requirements.
4.1 Hazards of Handling the Device
MEDENUS©devices conform with current standards and directives, the recognized technical rules and the recognized
safety rules.
However, improper use can result in hazards to the user or to third parties. This can also result in damage to the device
or to the system.
This is why the device may only be used:
• in accordance with its designated use
• in perfect condition
• while observing the notes given in these operating and maintenance instructions, and inspection and
maintenance regulations, which apply to the functioning and safety of the overall system.
Malfunctions or faults must be eliminated immediately.
4.2 Personnel Requirements
The device may only be mounted by qualified personnel.
Only authorized personnel with the required qualification is allowed to perform settings or repairs on the device.
4.3 Country-Specific Requirements
The rules and regulations applicable at the place of use must be observed and complied with. They apply to:
• gas lines, installation of the gas system
• gas supply
• work on the gas system
• accident prevention
4.4 Handover of the Operating and Maintenance Instructions
The supplier of the system shall hand over these operating and maintenance instructions to the operator of the system
no later than during commissioning and training of the operating personnel with the reminder to carefully store these
instructions.

10
© 05.2022
4.5 Safety in Operation
The device may only be used when all protective devices on the device or in the system are fully functional.
At least once a year, the device must be inspected for externally visible damage and for proper functioning
by a representative of the manufacturer or by a qualified person.
A more frequent inspection may become necessary, depending on the system conditions.
4.6 What to Do in Case of Danger
Information on what is to be done in case of danger and in case of accidents can be found in the respective operator's or
specialist companies' work instructions.
5 Responsibility of the Operator
Operator An operator is a person who operates the device himself/herself for commercial or economic purposes
or leaves it to a third party for use/application and is legally responsible for the safety of the user, the
personnel or third parties during operation.
The device is used in the commercial sector. The operator of the device is therefore subject to the legal
obligations for occupational safety. In addition to the safety instructions contained in these instructions,
the established maintenance intervals must be observed, taking into account the respective national
standard (alarm and hazard prevention plan).
In particular, the following applies:
• The operator is obliged to perform work on MEDENUS©devices during the warranty period only
after consultation with the manufacturer. Otherwise the claims under warranty will become
void.
• The operator must obtain information on the current occupational safety regulations and
determine additional hazards resulting from the special work conditions at the place of use of
the device in a risk assessment. The owner must implement the results in the form of operating
instructions for the device.
• During the entire time of use of the device, the operator must check whether the operating
instructions issued by him/her conform to the current state of the regulations and, if necessary,
adapt them.
• The operator must clearly regulate and define the responsibilities for installation, operation,
troubleshooting, maintenance and cleaning.
• The operator must ensure that all persons handling the device have read and understood these
instructions. In addition, the owner must train the personnel at regular intervals and inform
them about the hazards.
• The operator must make available to the personnel the required protective equipment and
oblige them to wear the required protective equipment.
• Moreover, the operator is responsible for the device always being in technically perfect condition.
Therefore, the following applies:
• The operator must make sure that the maintenance intervals described in these instructions
are observed.
• The operator must have all safety devices checked regularly for functionality and completeness.
Operator
duties

11 © 05.2022
6 Transport, Storage and Packaging
6.1 Transport
The device is delivered with flange protection caps. They must be removed prior to installation.
Make sure that the device is transported horizontally using suitable lifting gear. The device must be
handled carefully and secured against impacts and knocks.
In case of transport damage, we will require the following information from the nameplate affixed to
the device:
• Device type
• Device model
• Year of construction/fabrication number
Note
6.2 Storage
Equipment and spare parts must be stored under the following conditions:
• Do not store outdoors.
• Store in a dry and dust-free location.
• Store on a flat surface.
• Do not expose to aggressive media.
• Do not expose to ozone or ionizing radiation.
• Do not store adjacent to direct heat sources.
• Avoid mechanical vibrations.
• Storagetemperature:0to25°C.
• Relative air humidity: < 55 %.
Spare parts:
• Components susceptible to corrosion must be provided with a suitable preservative.
• Do not store O-rings and seals for more than 5 years even if stored properly.
• Spare parts must be stored in their original packaging until use.
Storage period for devices:
• Storage of the device for up to one year:
Store the gas pressure regulator in its original packaging and original condition at the time of supply. All
protective caps of the device must remain mounted.
• Storage of the device for more than 1 year (e.g. as a spare device):
Store the device in its original packaging and its original condition as delivered and check it for damage once
a year. Check the housing surface for dirt, damage and corrosion. If necessary, clean all external parts. After
5 years, all O-rings and seals must be replaced.
6.3 Packaging
• The individual packaged items have been packaged in view of the transport conditions to be expected.
• The symbols on the packaging must be observed during transport and storage.
• Only environmentally friendly materials have been used for packaging.
• The packaging is designed for protecting the individual components from transport damage, corrosion and
other damage until mounting. This is why the packaging must not be destroyed and only removed just prior to
mounting.

12
© 05.2022
7 Mounting and Commissioning
7.1 Safety Instructions and Preparation
Prior to starting work on pressurized components:
• Close all connections to the gas line.
• Depressurize all pressurized components. Also discharge residual energies.
• Defective components charged with pressure in operation must be replaced immediately by
an appropriate expert.
Prior to starting work, ensure sufficient clearance for mounting.
Before installing the device, check whether the performance data (nameplate) and the scope of
delivery coincide with the order or the system data, i.e., make sure that the provided devices are
suitable for their intended purpose. In particular, the inlet pressure of the system must be lower than
the maximum allowable pressure of the device.
Direct contact of gas valves and fittings, i.e., the control system, with hardening masonry, concrete
walls or floors is not permitted. Provide suitable supports, working materials and protective
equipment.
Take into account the minimum clearances for maintenance as stated in the product information.
Before installing the device in the pipeline, check whether a shut-off device that interrupts the gas
flow supply to the device has been mounted upstream and downstream of the device to be installed.
Prior to commissioning, make sure that all installation work has been carried out and completed
in accordance with the data and information given in these instructions and that no unauthorized
persons stay in the danger zone.
DANGER
Note
Note
DANGER
7.2 Mounting
• Remove the packaging, flange protection caps and shipping braces.
• Check the device for wear and damage.
• Make sure that the device is installed free of stress. Tighten screws crosswise
(see DVGW info gas no. 19).
Make sure to observe the direction of flow, i.e., the arrow on the housing must point in
the direction of flow. For the assembly of the flange connections, the maximum values
specified by the flange and gasket manufacturers must be observed.
Max.flangetighteningtorque:M12(60Nm),M16(120Nm),M20(190Nm)
In installation positions other than horizontal, MEDENUS Gas-Druckregeltechnik GmbH
must be consulted.
• All breather lines (items 5.04 / 5.07) must be vented to the outside atmosphere.
• Breather lines (item 5.04) may not be required
if breather valves are being used.
• The measuring lines (items 5.05 / 5.08) must be connected in a pipeline section with a steady flow. There must
be no installations that cause flow interference such as shutters, expansions, manifolds, junctions, isolation
valves etc. directly upstream and downstream of the measurement point.
• The maximum flow rate at the measuring point must not exceed 25 m/s, depending on the system conditions.
• In certain system circuits, such as gas control systems for gas motors and in gas burners, higher flow rates
than 25 m/s are also possible. Please contact us.
• The measuring line must be connected to the pipeline separately, laterally or at the top for each device (1 gas
pressure regulator (item 5.03); 1 integrated SSV (item 5.06)).
Note
Note
Note

13 © 05.2022
5.01 5.02
5.03
5.05
5.04
5.10
5.09
5.13
5.12
5.11
5.06
5.07
5.08
5.28
min. 5x DN
Range for
measuring points*
(approx. 3x DN P2)
Connection
X
Y
Z
A
Ø
Nennweite /
nominal
size
Abmessung /
dimension (mm)
Anschluss Regler
/connection
Regulator
Anschluss Regler
Öffnungsdurchmesser /
connection Regulator
opening diameter (mm)
DN X Y Z Ø HD2 Atmungsleitung /
breathing line (A)
Atmungsleitung /
breathing line (A)
R51
25 178 59 160 145 112 RP1/4“ 2

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© 05.2022
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7.10
7.09
7.10
7.09
For Germany:
According to DVGW work sheet G 491, the fully assembled system must be subjected to a leakage test with air or an inert
gas at the installation site, using 1.1 times the maximum operating pressure of the system (MOP).
An exception is the room between the actuator and the first shut-off valve on the outlet side. This room must be checked
using the test pressure corresponding to the maximum permissible pressure in the system in case of a malfunction (1.1
MOPd). In this test, all detachable connections must be checked using a foaming agent.
In direct-acting devices (without power supply), the outlet pressure acting on the actuator should not
be more than 0.5 bar above the set setpoint. This should be taken into account when specifying the
response pressure of the upstream SSVs.
Recommended upper response pressures:
• pd≤100 mbar pdso = Pd+ 50 mbar
• pd> 100 - 200 mbar pdso = Pd+ 100 mbar
• pd> 200 - 1000 mbar pdso = Pdx 1,5
• pd> 1000 mbar pdso = pd+ 500 mbar
For other countries:
The relevant national and international standards shall apply.
Procedure
• Close the ball valve upstream of the valves and fittings (item 7.01).
• Close the downstream shut-off devices (item 7.13) (ball valve,
solenoid or pneumatic valve).
• Depressurize the system (item 7.11).
• If there is a SRV (safety relief valve) in the controlled section and
the test pressure is higher than the relief pressure of the SRV (item
7.09), the line upstream of the SRV (item 7.10) must be closed.
• Connect the testing device to measuring points upstream and
downstream of the gas pressure regulator (items 7.02 / 7.12).
• Always increase the test pressure slowly and steadily
(max. 500 mbar/sec.)
7.3 Leakage Test (Test for External Leakage)
The devices are subjected to a strength and leakage test ex works at MEDENUS Gas-Druckregeltechnik GmbH.
The leakage test in the fully assembled system must be performed prior to commissioning and following maintenance
work.
For the external leakage test in the fully assembled system, the following applies:
While doing so, you must ensure:
Pressure in outlet chamber (item 7.12) ≤pressure in inlet chamber (item
7.02)
Pressure build-up always from the inlet side (inlet chamber)
Pressure reduction always from the outlet side (outlet chamber)
• After leakage test: O p e n
the ball valve in the SRV line (item 7.10) again.
Note
ATTENTION
Note

15 © 05.2022
7.4 Initial Commissioning / Recommissioning
Initial commissioning of the system components shall be carried out by the operator. For commissioning, please refer to
thedocumentslistedunderitem1“GeneralInformation”andthesystemoperator'sworkinstruction.
The devices delivered by MEDENUS Gas-Druckregeltechnik GmbH are factory-set to the operating data specified by the
customer. This data is listed on the Acceptance Test Certificate (ATC)* and the type plate.
Prior to commissioning of the system, a functional test must be performed on the gas pressure
regulator (GPR), if applicable, and the safety shut-off and safety relief valves.
Procedure
• Close the ball valve upstream of the valves and fittings (item 7.01).
• Close the downstream shut-off devices (item 7.13) (ball valve, solenoid or pneumatic valve).
• Depressurize the system (item 7.11).
• Close the venting ball valve (item 7.11).
• Slowly open ball valve upstream of the valves and fittings (item 7.01) (max. 500 mbar/sec.).
If the inlet shut-off device is equipped with a bypass, the latter must be slowly opened for pressure
compensation as step 1. This is followed by slowly opening the inlet shut-off valve which will close the
bypass. The same is true of the outlet shut-off valve.
• For the functional test of the GPR, let gas flow via the discharge line (venting)
(item 7.11) to the outside atmosphere and read the set regulating pressure on
the outlet pressure gauge (item 7.12).
• It may be necessary to correct the setpoint of the outlet pressure.
This is done by turning the GPR setpoint setting screw (item 7.22) to the right
or left, in order to increase and decrease the setpoint, respectively, after
removal of the GPR sealing cap (item 7.21).
• After closing the discharge line (item 7.11), a constant closing pressure within
the closing pressure class can be read on the outlet pressure gauge (item
7.12).
• Slowly open the shut-off valve (item 7.13), close the discharge line (item 7.11)
and read the set regulating pressure on the outlet pressure gauge (item 7.12).
• It may be necessary to correct the setpoint of the outlet pressure once again.
• Screw on the GPR sealing cap (item 7.21) again.
Note
Note
*)AcceptanceTest Certificate(ATC)availableoptionally
7.21

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7.22
7.25
*) with high-pressure spring plate (HD1)
**) with high-pressure screw spindle (HD2)
Diaphragm
assembly Ø (mm) Spring data
160 Spring no.
Wire Ø
[mm]
Color
[RAL]
26 - 50 FG100 2.0 9006
50 - 90 FG101 2.3 5015
75 - 165 FG102 2.6 6018
130 - 345 FG103 3.2 3020
220 - 670 FG104 4.0 5010
525 - 1185 FG105* 4.5 6010
850 - 2070 FG106** 5.3 7035
1580 - 3900 FG107** 6.0 1028
7.5 Diaphragm assembly setpoint spring table
Changing the control range
Switching to the control range of a different setpoint spring can be done for the GPR
while the device is pressurized.
Gas pressure regulator
• Take off the sealing cap (item 7.21) and unscrew the setting screw (item 7.22),
• Pull out the spring (item 7.25) and replace the spring with one that fits.
• Screw in the setting screw (item 7.22) again.
• Set the desired setpoint and screw on the sealing cap (item 7.21) again.

17 © 05.2022
8 Maintenance
8.1 Maintenance Plan
The maintenance regulations of the system manufacturer must be observed. The following sections describe the
maintenance work required for optimal and trouble-free operation of the device.
If increased wear is detected during regular inspections, the required maintenance intervals must be shortened in
accordance with the actual wear.
For any questions on maintenance work and intervals, please contact the manufacturer.
The intervals for monitoring and maintenance work are strongly dependent on the operating situation and the condition
of the gas. This is why no fixed intervals can be given. For Germany, it is recommended that the maintenance periods as
specified in DVGW work sheet G 495 are observed initially. For each system, this must be followed by determining the
maintenance interval independently on a medium-term basis.
During maintenance work, the components must be cleaned and subjected to a thorough visual inspection. This is also
necessary if irregularities in the operating behavior have been detected during operation or during functional tests. The
check must cover the elastomers in particular.
Damaged parts and O-rings dismounted during dismantling must be replaced with new ones.
It is recommended to stock the parts listed in chapter 9.1 on page 19 for maintenance work.
Interval Maintenance work Personnel
According to the
data given in the
DVGW work sheet G
495 or if necessary
Replacing O-rings
Qualified person
Replacing diaphragms
Replacing the valve plate
7.6 Decommissioning
Fordecommissioning,pleaserefertothedocumentslistedunderitem1“GeneralInformation”
and the system operator's work instruction.
Procedure
• Slowly close the outlet shut-off valve (item 7.13)
• Close the ball valve upstream of the valves and fittings (item 7.01).
• Depressurize the system (item 7.11).
• Close the venting ball valve (item 7.11).

18
© 05.2022
50
51
8.3 Table of Screw Tightening Torques MA
Item
no. R51 / 025
50 M6/8Nm
51 M6/8Nm
8.4 Lubricants Table
Components (apply a thin layer) Lubricants Article no.
All O-rings Syntheso Proba 270 SYNTHESO-PROBA-270
All fastening and locking screws Anti Seize AS 450 AS-450
Oxygen model
For oxygen models, a suitable grease which is approved for the use
with oxygen must be used.
8.2 Maintenance Procedure
The maintenance procedure is described in detail step-by-step in our video tutorial and our pictorial descriptions.
Instructions for our products can be found in the download area of our website. Should you have any problems, please
feel free to contact us directly.
If components have been removed, make sure they are mounted correctly, reinstall all fastening
elements and observe the screw tightening torques. (see Table 8.3)
Prior to recommissioning, observe the following:
• Make sure that all maintenance work has been carried out and completed in accordance
with the data and information given in these instructions.
• Make sure that no unauthorized persons stay in the danger zone.
• Make sure that all covers and safety devices have been installed and are working properly.
For recommissioning, please refer to the relevant manufacturer's documentation of the gas pressure regulator installed
in the system, the work instructions of the system operator, and the other safety regulations of the system in which the
gas pressure regulator has been installed.
To guarantee smooth operation, we recommend always keeping a maintenance set in reserve.
ATTENTION
DANGER
Note
ATTENTION

19 © 05.2022
9 Troubleshooting
9.1 Gas Pressure Regulator
Description of the error Possible cause Elimination
Closing pressure too
high
No closing pressure
Actuator dirty or damaged Check valve plate (seal) and valve seat for damage
and dirt, replace valve plate, if necessary
Static sealing elements defective Replace O-rings
Clamping of the compensating
diaphragm has come off
Compensating membrane is damaged
or mounted incorrectly
Check compensating diaphragm for fastening,
damage, and correct fit, replace it, if necessary
Valve plate has become disconnected
from the valve stem Tighten nut under the valve plate
Valve plate dirty Clean the valve plate (use exclusively NBR-
compatible cleaning agent)
Unstable outlet
pressure curve
(vibrations, pulsation)
Device is working in the closing
pressure range Check regulator design
Vibration resonance in the control
system
Install restrictor plate in breather line
Install baffle plate in measuring line
Continue closing restrictor in measuring line by
turning clockwise *
Install a harder spring (setpoint spring of the next
higher control range)
Check setting of gas consumption devices
Use of throttle valve RSD (optional accessory)
Control deviation too
large
Unfavorable connection of the
measuring line
Select a measuring point with steady flow, check
measuring point
Sluggishness of the device due to dirt Subject device to maintenance
Main diaphragm or compensating
diaphragm defective or mounted
incorrectly
Check diaphragm and replace it, if necessary
Wrong regulator size selected
Wrong setpoint spring selected
Check regulator design
Check setpoint spring and replace it, if necessary
Inlet pressure supply is insufficient
(pressure losses in the supply line too
high)
Increase inlet pressure
Check pipeline cross-section
Check built-in filter
Inadmissible pressure
peak
Dynamic closing
pressure too high
Damping of the device too high
Control system too dynamic
Remove baffle plate from measuring line
Remove restrictor plate from breather line
Check breather lines, choose a larger diameter, if
necessary
Replace breather valve with breather line
Closing speed of downstream shut-off
devices too high Reduce closing speed of shut-off valve
Noise
Gas velocity too high Check regulator design
Sluggishness of the device due to dirt
/ wear
Perform maintenance on actuator
If worn-out mechanically, replace it, if necessary
Gas escapes through
breather line
Fastening of the main diaphragm has
come off
Main diaphragm is damaged or has
been mounted incorrectly
Check diaphragm for fastening, damage, and
correct fit

20
© 05.2022
10 Replacement and Disposal
After the device has reached the end of its useful life, it must be dismounted and disposed of in an environmentally
friendly manner.
During dismounting, components that may present a risk of injury by contamination,
depending on the medium, are removed. The components must be properly decontaminated depending
on the processed medium. Diffusible components (diaphragm, O-ring, etc.) may have to be taken
to a special disposal unit, depending on the medium used.
If no return or disposal agreement has been signed, disassembled components should be recycled:
• Metals should be scrapped
• The remaining components should be disposed of after sorting according to material.
For technical information, please contact our customer service:
MEDENUS©Gas-Druckregeltechnik GmbH
Im Langen Feld 3
D-57462 Olpe
Phone [phone] / 82788-0
Fax [phone] / 82788-9
E-mail [email protected]
Internet www.medenus.de
ATTENTION
11 Spare Parts
11.1 Parts for Maintenance Work
O-rings
Item
no.
Name Quantity
pcs.
Variant
exception/
version
R51 / 025
4 O-ring 1 O-013
7 O-ring 1 O-006
11 O-ring 1 O-007
17 O-ring 1 O-008
20 O-ring 1 O-013
2 HD2 O-013
O-ring set
order number: OS-061
Example:
Gas pressure regulator: R51 / 025
Spare parts according to tables in 11.1
Valve plate: VT-012
Diaphragm: M-001
Diaphragm: M-111
O-ring and sealing ring set: OS-061
Info: The allocation of individual parts is done according to the item no. in the tables in 11.1, conforming to the
spare parts sectional view in 11.2.
Valve Plates / Diaphragms
Item
no.
Name Quantity R51 / 025
6 Valve plate 1 VT-012
12 Diaphragm 1 M-001
16 Diaphragm 1M-111
In addition, we are always interested in information, suggestions and experience resulting from the application and
which can be valuable for improving our products.
Note