GEA VARIVENT FRS Operating Instruction Download Page 1

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Hygienic valves

GEA VARIVENT

FRS valve

Operating instruction (Translation from the original language)
430BAL013059EN_7

Summary of Contents for VARIVENT FRS

Page 1: ...Hygienic valves GEA VARIVENT FRS valve Operating instruction Translation from the original language 430BAL013059EN_7 ...

Page 2: ...rotected by copyright All rights reserved The document may not in whole or in part be copied reproduced translated or reduced to an electronic medium of machine readable form without the express permission of GEA Tuchenhagen GmbH LEGAL NOTICE Word marks The designations VARIVENT and T VIS are protected trademarks of GEA Tuchenhagen GmbH 430BAL013059EN_7 2 24 03 2022 ...

Page 3: ...ations 12 2 6 Qualification of personnel 12 2 7 Safety equipment 14 2 7 1 Signage 14 2 8 Residual dangers 15 2 9 Danger zones 16 3 Description 18 3 1 Design 18 3 2 Functional description 20 3 2 1 Installation position 20 3 2 2 Closing Direction 20 4 Transport and storage 21 4 1 Storage conditions 21 4 2 Transport 21 4 2 1 Scope of supply 21 5 Technical data 22 5 1 Type plate 22 5 2 Technical data ...

Page 4: ...C 43 10 6 Maintenance 43 10 6 1 Cleaning the Valve 43 10 6 2 Replacing Seals 44 10 6 3 Lubricating Seals and Threads 46 10 7 Installation 47 10 7 1 Torques for the Clamps and Clamp Connections 47 10 7 2 Connections and Operation 48 10 7 3 Pneumatic connection 49 Pneumatic connection Solenoid valve 5 2 way 24VDC 49 10 7 4 Electrical connections 50 Electrical 24 V DC Wiring 50 Electrical Wiring of A...

Page 5: ... the entire life cycle of the product When the location is changed or the product is sold make sure you also provide the Operating Instructions 1 1 2 Notes on the Illustrations The illustrations in these Operating Instructions show the product in a simplified form The actual design of the product can differ from the illustration For detailed views and dimensions of the product please refer to the ...

Page 6: ...in serious damage to the component or in the vicinity of the component The arrow identifies a precautionary measure you have to take to avoid the hazard Carry out the following steps Start of a set of instructions 1 First step in a sequence of operations 2 Second step in a sequence of operations Result of the previous operation The operation is complete the goal has been achieved Hint Further usef...

Page 7: ...ration of Conformity in accordance with the EC Machinery Directive 2006 42 EC General Information EU Declaration of Conformity in accordance with the EC Machinery Directive 2006 42 EC 430BAL013059EN_7 24 03 2022 7 ...

Page 8: ... declaration will become invalid if any alterations are made to the machine which have not been agreed with us We also declare that the relevant technical documentation for this machine has been prepared in accordance with Annex VII Part A and agree to submit the documentation on justified request of national authorities on a data carrier Person authorised for compilation and handover of technical...

Page 9: ...te for reliable and safe operation of the component is proper transportation and storage as well as professional installation and assembly Operating the unit within the limits of its designated use also involves adhering to the operating inspection and maintenance instructions 2 1 2 Pressure equipment directive The component is a piece of pressure equipment without safety function in the sense of ...

Page 10: ... described here are observed The operator s duty of care includes planning the necessary safety measures and monitoring that these measures are observed The following principles apply Only qualified personnel may work on the component The operating company must authorize personnel to carry out the relevant tasks Order and cleanliness must be maintained at the work stations and in the entire area s...

Page 11: ...ermissible conditions 2 4 1 Principles for safe operation Dangerous situations during operation can be avoided by safety conscious and proactive behaviour of the staff To ensure safe operation of the valve the following principles apply The Operating Instructions must be kept ready to hand at the valve s place of use They must be complete and in clearly legible form Only use the valve for its inte...

Page 12: ... permitted with the express permission of the manufacturer After completion of all work check that the protective devices are fully functional 2 5 Supplementary Regulations In addition to the instructions in this documentation the following also has to be observed pertinent accident prevention regulations generally accepted safety rules national regulations applicable in the country of use work an...

Page 13: ... the component Personal suitability for the respective task Sufficient professional qualification for the respective task Received instruction about the functionality of the component Received instruction about operating sequences on the component Familiar with the safety devices and their function Familiar with these Operating Instructions especially with the safety instructions and the informati...

Page 14: ...as Mechanical equipment Electrical equipment Pneumatic system Authorization with regard to safety engineering standards to carry out the following tasks Setting devices into operation Earthing of devices Marking of devices The relevant certificates of qualification must be submitted before work can be carried out on ATEX certified machines 2 7 Safety equipment 2 7 1 Signage Dangerous points on the...

Page 15: ...equipment Residual dangers on the valve and measures Danger Cause Measure Danger to life Inadvertent switch on of the valve Effectively disconnect all components effectively prevent switch on Electric power Observe the following safety rules 1 Isolate from the power supply 2 Take appropriate measures to prevent switch on 3 Test absence of voltage 4 Earthing and short circuiting 5 Cover or safeguar...

Page 16: ...o the environment For all work Collect lubricants in suitable containers Dispose of lubricants in accordance with the pertinent regulations 2 9 Danger zones Please observe the following notes Fig 4 In the event of malfunctions shut down the valve disconnect from the power and air supply and secure it against being used Never reach into the valve housing 1 when the valve is switching Fingers can be...

Page 17: ...l power supply Check the electrical equipment of the valve at regular intervals Immediately remedy loose connections and molten cables If work on live parts cannot be avoided call in a second person who can operate the main switch in case of an emergency The housing nozzle and the valve disk have very sharp edges When transporting and assembling the valve be sure to wear suitable protective gloves...

Page 18: ...ealing ring 3 Lantern 4 Spacer 5 Cylinder cover 6 Valve disk 7 Piston 8 Piston rod 9 Leadership 10 Cap 13 Circlip 14 Clamp connection 17 Cylinder screw hex socket 19 Guide ring 20 V ring 21 O ring piston rod seal 22 O ring piston Description Design 430BAL013059EN_7 18 24 03 2022 ...

Page 19: ...Design No Designation 23 O ring piston 24 O ring piston rod seal 25 O ring hood seal 41 Flush valve Description Design 430BAL013059EN_7 24 03 2022 19 ...

Page 20: ...ion position The valve is usually installed in hanging position overhead 3 2 2 Closing Direction Closing direction in hanging installation position from bottom to top air opening and air closing Fig 6 Description Functional description 430BAL013059EN_7 20 24 03 2022 ...

Page 21: ...age caused by impact or careless loading and unloading The outside synthetic materials are susceptible to breaking Control tops must be protected from animal and vegetable fats Only allow qualified staff to transport the valve Movable parts must be properly secured Only use approved fully functional load lifting devices and lifting accessories which are suitable for the intended purpose Observe th...

Page 22: ...FDA Control air pressure bar psi min 6 0 87 max 8 0 116 Product pressure bar psi 1 0 14 5 5 2 Technical data Refer to the following tables for the key technical data of the valve Technical data Valve Designation Description process housing CIP housing Size DN50 DN65 DN65 DN80 DN80 DN100 3 OD DN125 DN100 DN125 4 OD DN125 DN125 DN150 DN350 DN125 Material of product contact parts Stainless steel 1 43...

Page 23: ...ticle density max 5 mg m3 Water content Quality class 4 max dew point 3 C If the unit is used at higher altitudes or at low ambient temperatures the dew point must be adapted accordingly Oil content Quality class 3 preferably oil free max 1 mg oil in 1m3 air 5 3 Resistance and permitted operating temperature of the sealing materials The resistance and permitted operating temperature of the sealing...

Page 24: ...0 C 176 F Inorganic acids up to 5 up to 80 C 176 F o Inorganic acids up to 5 up to 100 C 212 F Water up to 100 C 212 F Steam up to 135 C 275 F o Steam approx 30 min up to 150 C 302 F o Fuels hydrocarbons Product with a fat content of max 35 Product with a fat content of more than 35 Oils Table sealing materials temperature resistance Sealing materials General temperature resistance EPDM 40 135 C 4...

Page 25: ...List of tools Tools Material no Hose cutter 407 065 V ring insertion tool 229 109 88 Strap wrench 408 142 Open end spanner a f 12 13 408 034 Open end spanner a f 13 17 408 036 Open end spanner a f 24 408 039 Hexagon socket SW 5 408 123 Screwdriver 406 117 Circlip fitting pliers 9065838 Circlip fitting pliers 408 283 5 6 Lubricants Lubricants Material no Rivolta F L G MD 2 413 071 PARALIQ GTE 703 4...

Page 26: ...Size process housing CIP housing Weight kg DN80 DN100 31 9 3 OD DN100 31 3 DN100 DN125 32 8 4 OD DN125 32 7 DN125 DN150 49 3 DN350 DN125 65 4 Technical data 430BAL013059EN_7 26 24 03 2022 ...

Page 27: ...s usually hanging however it can be installed as needed Care must be taken to ensure that the valve housing and the pipe system can drain properly If the valve is installed in the horizontal position pay attention that the vent hole in the actuator is aligned horizontally on one side To prevent damage make sure that the valve is installed in the pipe system free of tension and no foreign materials...

Page 28: ...ll cause malfunction of the valve Replace old seals Carry out the following steps 1 Remove valve insert see chapter dismantle valve FRS 2 Dismantle the flush valves 41 3 Weld the housing without sealing rings into position ensuring that the connection is free of stress 4 Fit the housing into place and tack it 5 Always close the housing before welding 6 Flush the housing with forming gas from the i...

Page 29: ...ols required A hose cutter Carry out the following steps 1 Shut off the compressed air supply 2 Use the hose cutter to cut the pneumatic hoses square 3 Push the air hose into the air connector of the drive 4 Re open the compressed air supply Establish a hose connection 6 6 Electrical connections Danger Live parts Electrical shock can result in serious personal injury or death Only allow properly q...

Page 30: ...reas Carry out the following steps 1 Connect in accordance with the connection diagram and the instructions in the corresponding operating instructions Done Hint The proximity switches are factory set During transport and installation it can happen that the settings are changed so that readjustment may be required Assembly and installation 430BAL013059EN_7 30 24 03 2022 ...

Page 31: ...nly allow properly qualified staff to set the valve into operation Establish all connections correctly The safety devices for the valve must be complete fully functional and in perfect condition Check the function before starting any work When the valve is switched on the danger zones must be free Remove any liquids that have escaped without leaving residues 7 2 Notes on commissioning Before start...

Page 32: ...protection type Protection by housing according to EN 60079 31 from the dust atmosphere and are thus protected The FRS valve may only be commissioned in the context of above device category if the hood 10 is screwed firmly until contact to the lantern 3 Moreover the hood seal 23 must also be installed as the pressure relief valve 39 Only original GEA Tuchenhagen GmbH spare parts may be used For us...

Page 33: ...ervals All guards and hoods must be fitted as intended The installation location of the component must always be properly ventilated Structural changes to the component are not permitted Report any changes to the component immediately to the person in charge Always keep danger zones clear Do not leave any objects in the danger zone Only allow persons to enter the danger zone when the machine is de...

Page 34: ...with the relevant process and product The cleaning effect must be checked regularly by the operator 9 1 1 Cleaning Process Examples Typical Cleaning Parameters in Dairy Operations Example of a two phase cleaning process Sodium hydroxide solution and sodium hydroxide based combination products in concentrations from 0 5 to 2 5 at 75 C 167 F to 80 C 176 F Phosphoric or nitric acid and combination pr...

Page 35: ...ted to different degrees This can impair the function and the service life 9 2 Passivation Before commissioning a plant passivation is commonly carried out for long pipes and tanks Valve blocks are usually excepted from this Passivation is typically performed using nitric acid HNO3 at approx 80 C 176 F at a concentration of 3 and a contact time of 6 to 8 hours Cleaning Passivation 430BAL013059EN_7...

Page 36: ...n to the maintenance or repair work going on Do not climb on the component Use suitable access aids and working platforms Wear suitable protective clothing Only use suitable and undamaged tools to carry out maintenance work When replacing parts only use approved fully functional load lifting devices and lifting accessories which are suitable for the intended purpose Before setting the unit back in...

Page 37: ... the following steps 1 Regularly check Sealing ring between upper housing and lantern V ring in the valve disks Done 10 2 2 Pneumatic connections Carry out the following steps 1 Check the operating pressure at the pressure reducing and filter station 2 Regularly clean the air filter in the filter station 3 Check that the air hoses sit firmly in the air connections 4 Check the lines for kinks and l...

Page 38: ...ion ambient conditions Maintenance Intervals Applications Maintenance intervals guideline values Media at temperatures of 60 C to 130 C 140 F to 266 F approx every 3 months Media at temperatures of 60 C 140 F approx every 12 months 10 4 Prior to disassembly Prerequisite Make sure that during maintenance and repair work no process is in operation in the area concerned Carry out the following steps ...

Page 39: ...s with sharp edges The valve disk 6 has sharp edges Always wear gloves and suitable safety equipment during installation Notice The valve disk 6 is a sensitive component Damage to these parts can result in a malfunction When the valve is pulled out the stem of the valve disk 4 must not hit the valve housing Do not set the valve insert down on the valve disk but lay it down Secure valve insert agai...

Page 40: ...llustration Fig 11 10 5 2 Open drive unit Prerequisite Remove hood 1 using a strap wrench and remove from the lantern 3 Tools required Strap wrench Hint Seal replacement In this state the hood seal 25 can be replaced see illustration Fig 12 Maintenance Disassembling Valve FRS 430BAL013059EN_7 40 24 03 2022 ...

Page 41: ...ction prior to dismantling the valve Carry out the following steps 1 Undo the cable connection at the board terminal strip 35 to the connector 40 2 Undo the hexagon head screws 18 3 Carefully pull the cylinder cover 5 together with the valve disk 6 out of the spacer 4 and the lantern 3 The valve disk unit is dismantled Done Maintenance Disassembling Valve FRS 430BAL013059EN_7 24 03 2022 41 ...

Page 42: ...ired Snap ring pliers Carry out the following steps 7 Undo the cylinder screw 17 and remove guide 9 8 Undo the spring lock washer 13 9 Carefully pull the piston rod 8 out of the valve disk 6 until the piston rod 8 together with the piston 7 are separated from the valve disk 6 The piston seals 22 23 and the piston rod seal 24 can now be accessed Maintenance Disassembling Valve FRS 430BAL013059EN_7 ...

Page 43: ...e 2 Take off the air hose 3 Unscrew the valve from the housing at area 2 4 Remove cylinder SPV C from housing 2 5 Take the spring 5 out of cylinder SPV C 1 6 Pull piston SPV C 4 out of cylinder SPV C 1 Done 10 6 Maintenance 10 6 1 Cleaning the Valve Maintenance Maintenance 430BAL013059EN_7 24 03 2022 43 ...

Page 44: ... a malfunction Observe the safety information sheets issued by the detergent manufacturers Only use detergents which are non abrasive and not aggressive towards stainless steel Carry out the following steps 1 Valve disassembly see Valve disassembly 2 Carefully clean the individual parts Done 10 6 2 Replacing Seals Hint Replace defective seals to ensure the tightness of the valve Always use origina...

Page 45: ...g is removed Grip the valve disk in a vice with protected jaws Unscrew the curved side of the scriber Carry out the following steps 1 Put a scriber into the V ring and take it out Fig 21 2 Before fitting wet the V ring on the side not in contact with product rear side Pay attention that water does not drip into the V ring groove on the valve disk 3 Put in the V ring Make sure the installation posi...

Page 46: ...bricant is applied No grease residues must be visible once the valve has been assembled completely For product contact seals only use suitable greases and oils Observe the safety information sheets issued by the lubricant manufacturer Carry out the following steps 1 Lightly grease the valve disk thread 2 Grease the thread on the housing of the rinsing valve at the indicated positions 1 2 3 Grease ...

Page 47: ...id A Manufacturer s Declaration for these products can be obtained from GEA Tuchenhagen if required A thin film of grease is required on the seals to ensure the proper function of the fittings It reduces friction and extends the service life of the seals This is absolutely harmless from a health and hygienic point of view Running dry must be avoided 10 7 Installation Assemble the valve in reverse ...

Page 48: ...oke air connection 35 AS i board or 24 VDC module 36 5 2 way solenoid valve 38 Initiators 39 Outlet and inlet valve of the main stroke the connection must not be closed 40 Connector M12 AS i 4 pole or 24 VDC 8 pole Maintenance Installation 430BAL013059EN_7 48 24 03 2022 ...

Page 49: ...e inner air routing into the main drive seeSection 10 7 2 Page 48 10 7 3 1 Pneumatic connection Solenoid valve 5 2 way 24VDC Fig 26 X exhaust air Y supply air Shorten all hose connections to minimum length and fix with cable binders if necessary Do not pinch hoses when mounting the hood Maintenance Installation 430BAL013059EN_7 24 03 2022 49 ...

Page 50: ...ons check the maximum permissible operating voltage 10 7 4 1 Electrical 24 V DC Wiring Fig 27 Connector M12 4 pole 1 L UV L 24 V DC supply voltage 2 S1 Feedback unit end position 1 3 L Gnd 4 S2 Feedback unit end position 2 5 PV Y1 Actuation of solenoid valve Y1 6 PV Y2 Actuation of solenoid valve Y2 Carry out the following steps 1 Connect cable via air connector M12 8 pole Done Maintenance Install...

Page 51: ... 28 Connector M12 4 pole 1 ASI 2 nc not connected 3 ASI 4 nc not connected Carry out the following steps 1 Connect cable via air connector M12 4 pole Done 10 7 4 3 Setting the feedback Fig 29 Maintenance Installation 430BAL013059EN_7 24 03 2022 51 ...

Page 52: ...equired Hose cutter Carry out the following steps 1 Shut off the compressed air supply 2 Use the hose cutter to cut the pneumatic hoses square 3 Push the air hose into the air connector on the control top 4 Release compressed air supply only when all jobs have been completed Done Hint Avoid kinks in the pneumatic hoses 10 7 5 Checking the function Setting the valve stroke Carry out the following s...

Page 53: ...troke Valve size process housing CIP housing Valve stroke mm DN80 DN100 124 6 3 OD DN100 124 6 DN100 DN125 124 6 4 OD DN125 124 6 DN125 DN150 151 6 DN350 DN125 124 6 Maintenance 430BAL013059EN_7 24 03 2022 53 ...

Page 54: ...nd check air hoses for free passage and air tightness Fault in the electrical system Check actuation external controller and routing of electrical lines Solenoid valve defective Replace the solenoid valve Valve does not close Dirt foreign material between valve seat and valve disk Clean valve housing and valve seat Valve closes too slowly O rings in actuator and control top are dry friction losses...

Page 55: ...e the storage conditions see Chapter 4 Page 21 12 2 Disposal 12 2 1 General notes Dispose of the component in an environmentally safe manner Observe the statutory waste disposal regulations applicable at the place of installation The component consists of the following materials Metals Synthetic materials Electronic parts Lubricants containing oil and grease Separate the different materials and di...

Page 56: ...13 Spare parts list VARIVENT FRS Valve Fig 30 Spare parts list VARIVENT FRS Valve 430BAL013059EN_7 56 24 03 2022 ...

Page 57: ...ow screw in plug connection G1 8 6 4 Brass nickel plated 933 475 933 475 17 Cylinder screw hex socket 1 4301 902 092 902 092 18 Hexagon nut self locking A2 910 020 910 020 19 Guide ring Turcite T51 935 078 935 078 Guide ring 3A MF6 935 120 935 120 20 V ring AX EPDM 932 023 932 023 FKM 932 034 932 034 FFKM 932 115 932 115 21 O ring NBR 930 016 930 016 22 NBR 930 044 930 044 23 NBR 930 633 930 633 2...

Page 58: ... 221 464 26 221 464 26 FKM 221 464 29 221 464 29 Flushing valve FRS 3A EPDM 221 464 34 221 464 34 FKM 221 464 35 221 464 35 42 Locking screw Brass nickel plated 922 344 922 344 Sealing set EPDM NBR 221 006981 221 006981 FKM NBR 221 006984 221 006984 FFKM FKM NBR 221 006987 221 006987 Spare parts list VARIVENT FRS Valve 430BAL013059EN_7 58 24 03 2022 ...

Page 59: ...bow screw in plug connection G1 8 6 4 Brass nickel plated 933 475 933 475 17 Cylinder screw hex socket 1 4301 902 092 902 092 18 Hexagon nut self locking A2 910 020 910 020 19 Guide ring Turcite T51 935 076 935 076 Guide ring 3A MF6 935 119 935 119 20 V ring AX EPDM 932 027 932 027 FKM 932 038 932 038 FFKM 932 118 932 118 21 O ring NBR 930 016 930 016 22 NBR 930 044 930 044 23 NBR 930 107 930 107 ...

Page 60: ... FRS EPDM 221 464 26 221 464 26 FKM 221 464 29 221 464 29 Flushing valve FRS 3A EPDM 221 464 34 221 464 34 FKM 221 464 35 221 464 35 42 Locking screw Brass nickel plated Sealing set EPDM NBR 221 006982 221 006982 FKM NBR 221 006985 221 006985 FFKM FKM NBR 221 006988 221 006988 Spare parts list VARIVENT FRS Valve 430BAL013059EN_7 60 24 03 2022 ...

Page 61: ...lbow screw in plug connection G1 8 6 4 Brass nickel plated 933 475 933 475 17 Cylinder screw hex socket 1 4301 902 092 902 092 18 Hexagon nut self locking A2 910 020 910 020 19 Guide ring Turcite T51 935 076 935 076 Guide ring 3A MF6 935 119 935 119 20 V ring AX EPDM 932 027 932 027 FKM 932 038 932 038 FFKM 932 118 932 118 21 O ring NBR 930 016 930 016 22 NBR 930 044 930 044 23 NBR 930 107 930 107...

Page 62: ...e FRS EPDM 221 464 26 221 464 26 FKM 221 464 29 221 464 29 Flushing valve FRS 3A EPDM 221 464 34 221 464 34 FKM 221 464 35 221 464 35 42 Locking screw Brass nickel plated Sealing set EPDM NBR 221 006982 221 006982 FKM NBR 221 006985 221 006985 FFKM FKM NBR 221 006988 221 006988 Spare parts list VARIVENT FRS Valve 430BAL013059EN_7 62 24 03 2022 ...

Page 63: ...16 Elbow screw in plug connection G1 8 6 4 Brass nickel plated 933 475 933 475 17 Cylinder screw hex socket 1 4301 902 092 902 092 18 Hexagon nut self locking A2 910 020 910 020 19 Guide ring Turcite T51 935 079 935 076 Guide ring 3A MF6 935 121 935 119 20 V ring AX EPDM 932 059 932 027 FKM 932 063 932 038 FFKM 932 118 21 O ring NBR 930 016 930 016 22 NBR 930 044 930 044 23 NBR 930 120 930 107 24 ...

Page 64: ...g Valve FRS EPDM 221 464 26 221 464 23 FKM 221 464 29 221 464 30 Flushing valve FRS 3A EPDM 221 464 34 221 464 34 FKM 221 464 35 221 464 35 42 Locking screw Brass nickel plated Sealing set EPDM NBR 221 006983 221 006982 FKM NBR 221 006986 221 006985 FFKM FKM NBR 221 006988 Spare parts list VARIVENT FRS Valve 430BAL013059EN_7 64 24 03 2022 ...

Page 65: ...14 Dimension sheet Valve FRS Fig 31 Dimension sheet Valve FRS 430BAL013059EN_7 24 03 2022 65 ...

Page 66: ...159 5 150 150 72 5 DN350 DN125 355 6x3 129x2 259 5 250 250 207 connection is reduced to ØCIP with length C1 FRS valve Size Process Housing CIP housing Actuator Dimensions Valve D1 H2 Removing Stroke S Weight DN50 DN65 142 310 370 73 5 18 9 DN 65 DN80 142 304 364 73 5 19 7 DN80 DN100 169 414 484 124 6 31 9 3 OD DN100 169 414 484 124 6 31 3 DN100 DN125 169 414 484 124 6 32 8 4 OD DN125 169 414 484 1...

Page 67: ...ation Short designation according to DIN ISO 1629 Ethylene Propylene Diene Rubber F Unit of measurement of temperature degree Fahrenheit FKM Material designation short designation according to DIN ISO 1629 Fluorine rubber h Unit of measurement of time hour HNBR Material designation Short designation according to DIN ISO 1629 Hydrogenated Acrylonitrile Butadiene Rubber IP Protection class ISO Inter...

Page 68: ...oethylene SET UP Self learning installation During commissioning and maintenance the SET UP procedure carries out all the necessary settings for the generation of messages SW Indicates the size of spanners width across flats T VIS Tuchenhagen Valve Information System V AC Volt alternating current V DC Volt direct current W Unit of measurement of power Watt TIG Welding method Tungsten inert gas wel...

Page 69: ...Appendix 430BAL013059EN_7 24 03 2022 69 ...

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