MEDENUS SL 10 Manual

© 05.2022
Safety Relief Valve
SL 10
Operating and Maintenance Instructions

Subject to technical modifications! Reprint prohibited!

Actuator housing
Actuator
Main diaphragm
Adjusting screw
Spindle
Internal
measurement port
Design of the safety relief valve SL10
Diaphragm plate
Valve plate
Connection of
breather line

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 16
8 Maintenance 16
8.1 Maintenance Plan 16
8.2 Maintenance Procedure 17
8.3 Table of Screw Tightening Torques MA 17
8.4 Lubricants Table 17
Oxygen model 17
For oxygen models, a suitable grease which is approved for the use 17
with oxygen must be used. 17
9 Troubleshooting 18
9.1 Safety Relief Valve 18
10 Replacement and Disposal 19
11 Spare Parts 19
11.1 Parts for Maintenance Work 19
O-Rings and Sealing Rings 19
Valve Plate / Diaphragm 19
11.2 Spare Parts Drawing SL10 20
Notes 21

12 Accessories / Options 22
12.1 Leakage Gas Quantity Display 22
Type LI-1 23
Type LI-2 23
Pin assignment 23
Type LI-1 angled type 24
Type LI-2 straight type 24
12.2 BV breather valve 25
12.2 HD-2 version 26
Notes 27
13 Declaration of Conformity 30

6
© 05.2022
1 General Information
The personnel entrusted with installation, operation or maintenance of the safety relief valve must
have completely read and understood beforehand the following documents:
• Safety Relief Valve SL 10 Product Information
The product information contains technical data, dimensions and a description of the design and the mode of
operation.
• Safety Relief Valve SL 10 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 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
SSV Safety shut-off valve
SRV Safety relief valve

8
© 05.2022
2 Application, Characteristics
2.1 Application
Safety relief valve (SRV), direct-acting (operating without auxiliary power), for systems acc. to
DVGW work sheets G 491 (A) and G 600 (A) (TRGI)
Can be used as an equipment component on gas consumption facilities as defined in Regulation (EU) 2016/426.
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)
 • ClassA
 • Open-airmodel
3 Avoidance of Foreseeable Misuse
2.3 Types of Models (Options)
 • TheSRVmustnotbeusedtocontrolliquids.
 • TheSRVmustnotbeusedintemperaturerangesbelow-20°Corabove60°C.
 • TheSRVmustnotbeusedforpressurerangeshigherthanthepressure“PS“indicatedonthenameplate.
 • TheSRV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SRVmustnotbeusedinhigh-temperatureareas(HTB)withoutanupstreamHTBfuse.
• Oxygenmodel
• HD2 model
• Hydrogen model

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 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 safety relief valve in its original packaging and its original condition as delivered. 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.

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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. Make sure to observe the direction of
flow i.e., the arrow on the housing must point in the direction of flow.
• All breather lines (items 7.04 / 7.07) must be vented to the outside atmosphere.
• The breather line (item 7.04) may not be required if breather valves are used
Note
Note
Note
Gas pressure regulators Flange tightening torques
Screw size Screw tightening
torque MA
Screw size Screw tightening
torque MA
M6 8Nm M12 60Nm
M8 18Nm M16 120Nm
M10 36Nm M20 190Nm
M12 62Nm
Tightening torques MA*)
*) For the assembly of the flange connections, the maximum torques specified by the flange and gasket manufacturers
must be observed. The values indicated here should be considered as approximate values.
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, or the system must be declared to be differential
pressure-resistant.
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 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

13 © 05.2022
Connection
7.01 7.02 7.03
7.06 7.07 (A) 7.08 (I)
7.04 (A)
7.05 (I)
7.10
7.11 7.12
7.09 7.13
7.28
Measuring
point
Measuring
point
Fig. 7.1
Filter
DF100
X
Y
Z
A
7.04 (A)
Ø
Nennweite /nominal
size
Abmessung /
dimension (mm)
Anschluss Regler
/connection
Regulator
Anschluss Regler
Öffnungsdurchmesser /
connection Regulator
opening diameter (mm)
DN
Connection
/
connection
X Y Z Ø HD2 Atmungsleitung /
breathing line (A)
Atmungsleitung /
breathing line (A)
SL10
25 RP1“ 173 53 100
145 112 RP1/4“ 240 RP 1½“173 61 140
50 RP2“ 173 61 160

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U
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D
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G
a
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-
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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.
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).
• Connect the testing device to measuring points upstream and
downstream of the gas pressure regulator (items 7.02 / 7.12).
• Test the tightness of the safety relief valve (item 7.09) until the
response pressure is reached and then close the line upstream of
the SRV (item 7.10).
• Always increase the test pressure slowly and steadily.
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: Open the ball valve in the SRV line (item 7.10) again.
Note
ATTENTION

15 © 05.2022
7.21
7.25
7.22
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.
• For a functional test of the SRV, increase the gas pressure with the controller
until the SRV responds and read the set regulating pressure on the outlet
pressure gauge (item 7.12).
• If necessary, correct the response pressure.
This is done by turning the SBV setpoint setting screw (item 7.22) to the right
or left, in order to increase and decrease the setpoint, respectively, after
removal of the sealing cap (item 7.21).
• Screw on the sealing cap (item 7.21) again.
Changing the control range
Switching to the control range of a different setpoint spring can be done for the SRV
while the device is pressurized.
• 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).
*) Acceptance Test Certificate (ATC) available optionally
**) with high-pressure spring plate (HD1)
***) with high-pressure screw spindle (HD2)
5.5 Diaphragm assembly setpoint spring table
Pressure range
(mbar) Spring data
Spring no.
Color
[RAL]
20 - 39 FG100 9006
35 - 71 FG101 5015
55 - 131 FG102 6018
105 - 275 FG103 3020
215 - 575 FG104 5010
415 - 1050 FG105** 6010
900 - 1950 FG106*** 7035
1750 - 3560 FG107*** 1028

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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 the 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 9.2 on page 22 for maintenance work.
Interval Maintenance work Personnel
When necessary
Replacing O-rings
Qualified person
Replacing diaphragms
Replacing the valve plate
Replacing sealing rings for the connections of the breather lines
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) or
• Slowly lower the outlet pressure via the setpoint setting screw until the reserve rail takes over the gas supply
or
• Slowly raise the setpoint of the reserve rail until the operating rail is disabled.
• Close the ball valve upstream of the valves and fittings (item 7.01).
• Depressurize the system (item 7.10).
• Close the venting ball valve (item 7.10).

17 © 05.2022
51
50
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.
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 safety relief valve has been installed.
To guarantee smooth operation, we recommend always keeping a maintenance set in reserve.
ATTENTION
DANGER
Note
8.3 Table of Screw Tightening Torques MA
Item
no.
SL10/Rp1“
SL10/Rp11/2“
SL10/Rp2“
50 M6/8Nm
51 M6/8Nm
8.4 Lubricants Table
Components (apply a thin layer) Lubricants
All O-rings
Syntheso Proba 270
All fastening and locking screws
oxygen model
For oxygen models, a suitable grease which is approved for the use
with oxygen must be used.
ATTENTION

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© 05.2022
9 Troubleshooting
9.1 Safety Relief Valve
Description of the error Possible cause Elimination
SRV vents during
operation
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
Valve plate has become disconnected
from the valve stem Tighten nut under the valve plate
SRV settings are incorrect Check SRV settings
SRV set too low Check SRV settings
Sluggishness of the device due to dirt Subject device to maintenance
SSV frequently shuts
off
Stopcock upstream of SRV is closed Open stopcock
SSV set too low or SRV set too high Check SSV and SRV settings
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

19 © 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 and Sealing Rings
Item
no.
Name Quantity
pcs.
Exception SL10/Rp1“
SL10/Rp11/2“
SL10/Rp2“
4 O-ring 1 O-013
7 O-ring 1 O-007
11 O-ring 1 O-007
14 NBR ring 2 N-001
20 O-ring 1 O-013
2 HD2 O-013
O-ring set
order number: OS-081
Example:
Safetyreliefvalve: SL10/Rp1“
Spare parts according to tables in 9.1
Valve plate SRV: VT-213
Diaphragm SRV: M-111
O-ring and sealing ring set: OS-081
Info: The allocation of individual parts is done according to the item no. in the tables in 9.1, conforming to the spare
parts drawings in 9.2.
Valve Plate / Diaphragm
Item
no.
Name Quantity SL10/Rp1“
SL10/Rp11/2“
SL10/Rp2“
6 Valve plate 1 VT-213
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

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© 05.2022
20
16
11
14
6
7
4
20
11.2 Spare Parts Drawing SL10
SL10 shown with
high-pressure spindle HD2