Bürkert Type 2000 User manual

Service Manual
Type 2000, 2002, 2012
Replacement of valve and seal set
Conversion of control function

We reserve the right to make technical changes without notice.
Technische Änderungen vorbehalten.
Sous réserve de modifications techniques.
© Bürkert Werke GmbH & Co. KG, 2015 - 2017
Operating Instructions 1709/15_EU-EN_00804144 / Original DE

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Type 2000, 2002, 2012
Content
1SERVICE MANUAL.................................................................................................................................5
1.1 Symbols........................................................................................................................................5
2BASIC SAFETY INSTRUCTIONS ...........................................................................................................6
3GENERAL INFORMATION......................................................................................................................7
3.1 Contact addresses.......................................................................................................................7
3.2 Warranty .......................................................................................................................................7
3.3 Information on the Internet..........................................................................................................7
3.4 Reengineering ..............................................................................................................................7
3.5 Auxiliary materials........................................................................................................................7
4EXPLODED-VIEW DRAWING.................................................................................................................8
5REPLACING THE SEAL SET ................................................................................................................10
5.5.1 Disassembly ...............................................................................................................10
5.5.2 Assembly ....................................................................................................................12
6REPLACING THE PACKING GLAND....................................................................................................15
7REPLACING THE VALVE SET ..............................................................................................................18
8REPLACING THE VALVE SEAT ............................................................................................................20
9CONVERSION OF CONTROL FUNCTION ...........................................................................................22
9.1 Description of the functions ......................................................................................................22
9.1.1 Control function A (CFA) .............................................................................................22
9.1.2 Control function B (CFB).............................................................................................22
9.1.3 Control function I (CFI)................................................................................................22
9.1.4 Flow below the seat....................................................................................................22
9.1.5 Flow above the seat ...................................................................................................23
9.2 Conversion from control function A (CFA) to control function B (CFB)...................................24
9.3 Conversion from control function A (CFA) to control function I (CFI) ......................................26
9.4 Conversionfromowabovetheseattoowbelowtheseat..................................................27
9.5 Conversionfromowbelowtheseattoowabovetheseat..................................................28
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Type 2000, 2002, 2012
10 INSTALLATION TOOLS.........................................................................................................................29
10.1 Installationwrenchforactuatorcover ......................................................................................29
10.2 Assembly tools for packing gland.............................................................................................30
10.2.1 Assembly sleeve .........................................................................................................30
10.2.2 Installation wrench .....................................................................................................30
10.3 Installation tool for valve seat....................................................................................................31
11 PARTS ORDER .....................................................................................................................................32
11.1 Replacement part sets...............................................................................................................32
11.1.1 Seal set actuator.........................................................................................................35
11.1.2 Valve set .....................................................................................................................36
11.1.3 Valvettings(Type2012) ............................................................................................37
11.1.4 Sealsetswivelplate(Type2012)................................................................................37
11.1.5 Sealsetpackinggland(Type2012)............................................................................37
11.2 Conversion sets Type 2000 .......................................................................................................38
11.2.1 ConversionsetformodicationfromCFAtoCFB .....................................................38
11.2.2 ConversionsetformodicationfromCFAtoCFI.......................................................38
11.2.3 Conversionsetformodicationfromowabovetheseattoowbelowtheseat.....38
11.2.4 Conversionsetformodicationfromowbelowtheseattoowabovetheseat.....38
11.3 Conversion sets Type 2002 .......................................................................................................39
11.4 Conversion sets Type 2012 .......................................................................................................39
11.4.1 ConversionsetformodicationfromCFAtoCFBorCFI ..........................................39
11.4.2 Conversionsetformodicationfromowabovetheseattoowbelowtheseat.....39
11.4.3 Conversionsetformodicationfromowbelowtheseattoowabovetheseat.....39
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Service manual
Type 2000, 2002, 2012
1 SERVICE MANUAL
Theservicemanualdescribetheprocedurefor:
•ReplacementofvalveandsealsetsofprocessvalvesType2000,2002and2012.
•ConversionofthecontrolfunctionforprocessvalvesType2000(angleseatvalve)andTypes2002and
2012(globeseatvalves).
Keep these instructions in a location which is easily accessible to every user and make these instructions
available to every new owner of the device.
WARNING!
The service manual contain important safety information.
Failure to observe these instructions may result in hazardous situations.
▶Theservicemanualmustbereadandunderstood.
1.1 Symbols
DANGER!
Warns of an immediate danger!
▶Failuretoobservethewarningmayresultinafatalorseriousinjury.
WARNING!
Warns of a potentially dangerous situation!
▶Failuretoobservethewarningmayresultinseriousinjuriesordeath.
CAUTION!
Warns of a possible danger!
▶Failuretoobservethiswarningmayresultinamoderatelysevereorminorinjury.
NOTE!
Warns of damage to property!
▶Failuretoobservethewarningmayresultindamagetothedeviceortheequipment.
Designatesadditionalsignicantinformation,tipsandrecommendations.
Refers to information in these operating instructions or in other documentation.
▶designatesinstructionsforriskprevention.
→designatesaprocedurewhichyoumustcarryout.
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Basic safety instructions
Type 2000, 2002, 2012
2 BASIC SAFETY INSTRUCTIONS
Thesesafetyinstructionsdonotmakeallowanceforany
•contingenciesandeventswhichmayariseduringtheinstallation,operationandmaintenanceofthedevices.
•localsafetyregulations;theoperatorisresponsibleforobservingtheseregulations,alsowithreferenceto
the installation personnel.
Danger – high pressure!
▶Beforelooseningthelinesandvalves,turnothepressureandventthelines.
Risk of electric shock!
▶Beforereachingintothedeviceortheequipment,switchothepowersupplyandsecuretoprevent
reactivation!
▶Observeapplicableaccidentpreventionandsafetyregulationsforelectricalequipment!
Riskofburns/riskofreifusedcontinuouslythroughhotdevicesurface!
▶Keepthedeviceawayfromhighlyammablesubstancesandmediaanddonottouchwithbarehands.
General hazardous situations.
▶Thesystemcannotbeactivatedunintentionally.
▶Installation and repair work may be carried out by authorized technicians only and with the appropriate
tools.
▶Afteraninterruptioninthepowersupplyorpneumaticsupply,ensurethattheprocessisrestartedina
denedorcontrolledmanner.
▶Thedevicemaybeoperatedonlywheninperfectconditionandinconsiderationoftheoperating
instructions.
▶Thegeneralrulesoftechnologyapplytoapplicationplanningandoperationofthedevice.
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General information
Type 2000, 2002, 2012
3 GENERAL INFORMATION
3.1 Contact addresses
Germany
Bürkert Fluid Control Systems
Sales Center
Christian-Bürkert-Str. 13-17
D-74653Ingelngen
Tel.+49(0)7940-1091111
Fax+49(0)7940-1091448
E-mail:[email protected]
International
Contactaddressesarefoundonthenalpagesofthe
printedoperatingmanual.
YoucanalsondinformationontheInternetunder:
www.burkert.com
3.2 Warranty
Thewarrantyisonlyvalidifthedeviceisusedasauthorizedinaccordancewiththespeciedapplication
conditions.
3.3 Information on the Internet
TheoperatinginstructionsanddatasheetsforType2000,2002and2012canbefoundontheInternetat
www.burkert.com
3.4 Reengineering
ReengineeringofType2000and2012changesthespareparts.Thesparepartsetsincludeallsparepartsfor
bothvalveversions.Thereengineeredvalvesareidentiedbytheletter“R”(seetherstlineofthetypelabel).
Flow 1 2
2000 A 50,0 NBR RG
Made in Germany
00182076 W1X LU
G 2 P med 16 bar
Pilot 1,6 - 10 bar
RIdenticationof
re-engineereddevices
Figure 1: Example of a type label with identication “R” for “Re-engineering”
3.5 Auxiliary materials
Thefollowingauxiliarymaterialsarerecommendedforconversionandrepairintheseinstructions:
Type of auxiliary material Auxiliary materials Manufacturer’s information
Sealerandanti-seizeagents SiliconegreaseOKS1110-3 OKSSchmierstoeGmbH
www.oks-germany.com
Lubricatingpaste KlüberpasteUH196-402 Klüber Lubrication München
www.klueber.de
Lubricant AmblygonTA Klüber Lubrication München
www.klueber.de
Liquidadhesive Loctite 274 HenkelLoctiteDeutschlandGmbH
www.loctite.de
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Exploded-view drawing
Type 2000, 2002, 2012
4 EXPLODED-VIEW DRAWING
*Sleeverequiredtoreduce
the bore hole
(for DN50 and above)
C
31
32
26
40
4
3
1
5
12
19
30
23
22
21
24
28
25
29
20
3*
17
6/8
2
7
13
15
13
11
16
Control function A
(closed in rest position by
springforce)
Actuator sizeG(R),H(R)
Type2000Valve body Type2002 Type2012
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Exploded-view drawing
Type 2000, 2002, 2012
30
35
34
Control function B
(opened in rest position
byspringforce)
Control function I
(dualacting)
ActuatorsizeC,controlfunctionA
(without transparent cap)
ActuatorsizeC,controlfunctionB
(with transparent cap)
13
15
14
37
36
11
10
16
7
18
32
53
21
23
28
32
30
11
6
10
8
12
17
18
11
7
6
Actuator sizeC,D,E,F,G,H
Actuator sizeE(R),F(R)
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Replacing the seal set
Type 2000, 2002, 2012
5 REPLACING THE SEAL SET
Concerns valves withoutidentication“R”intheactuatorsizes:C(40mm),
D(50mm),
E(63mm),
F(80mm),
G(100mm),
H (125 mm)
Valveswithidentication“R”seechapter“6”,page15.
DANGER!
Danger – high pressure!
▶Turnothepressureandventthelinesbeforelooseninglinesorvalves.
Risk of injury from improper maintenance!
▶Maintenance may be performed by authorized technicians only!
▶Toscrewonorunscrewvalvebodyoractuator,useanopen-endwrench,neverapipewrench.
▶Observetighteningtorques.
Requiredparts:
Item Description Item Description
5Graphiteseal(packed) 30 O-ring
7 Wiper 32 O-ring(lipsealactuatorsizeC
without transparent cap)
11 O-ring 36 O-ring(actuatorsizeC)
13 Chevron seal 37 Lip seal (actuator size C)
21 O-ring 53 Self-lockingring(actuatorsizeC,
without transparent cap)
23 Piston seal
NOTE!
The actuator must be completely removed to replace all the seals. A special Bürkert assembly sleeve
is required to mount the packing gland.
Do not use any pointed or sharp instruments!
5.5.1 Disassembly
→Mount valve 1on the body.
→OnlyforcontrolfunctionAandI: Pressurize lower control air connection with compressed air (5 bar).
→Screw actuator on the nipple 6out of the valve body 1.
→Vent actuator.
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Replacing the seal set
Type 2000, 2002, 2012
CAUTION!
Danger through taut springs!
▶Carefully open piston actuator!
→Unscrew cover 31 withspecialwrenchholdinguptheactuatorbody 12 againstthehexagon.
Informationonthespecialwrenchcanbefoundinchapter“10Installationtools”.
→OnlyforactuatorsizeGandH: Remove washer 40 .
→OnlyforcontrolfunctionA:Removepressuresprings 28 29 .
→Remove position indicator 26 with Allen key.
→Carefully screw in actuator on the swivel plate 3(only put pressure on the upper section of the swivel
plate).
→Release nuts 25 .
→Remove pistons 22 withsupportingwasher 24 .
→OnlyforcontrolfunctionA:Removellerpiece 19 with intermediate washer 20 andO-ring 21 .
→OnlyforcontrolfunctionB: Remove intermediate washer 20 ,O-ring 21 andpressurespring 35 .
→OnlyforcontrolfunctionI:Removellerpiece 19 with intermediate washer 20 andO-ring 21 .
→Remove spindle 2from actuator body 12 and clean spindle thread.
→Clampactuatoronthenipplehexagon 6.
For actuator size D (50 mm) the tube 8isscrewedandsealedinthenipple 6.
→Release and remove screw 18 with socket spanner.
→Removedisksprings 17 .
→Remove actuator body 12 .
→OnlyactuatorsizeC:ReplaceO-ring 11 .
Reinforcing ring 10 remains on the tube 8.
→Slidepackingglandset 7, 13 , 15 , 16 carefully out of the tube 8.Takecarethatthetubeisnot
damaged.
→Cleanallreplacementpartsthoroughlyafterremoval.
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Replacing the seal set
Type 2000, 2002, 2012
5.5.2 Assembly
Rebuildpackingglandsetbasedaccordingtothedrawing:
→Lubricate new wiper 7withsiliconegreaseOKS1110-3andinsertintothetube 8.
→Lubricate individually chevron seal 13 liberallywithsiliconegreaseOKS1110-3.
→OnlyforactuatorsizeC:Assemblepackingglandset 7, 13 , 14 , 15 , 16 in the tube 8intheright
sequence(seedetaileddrawing).
→OnlyforactuatorsizeD,E,F,G,H:Assemblepackingglandset 7, 13 , 15 , 16 in the tube 8in the
rightsequence(seedetaileddrawing).
13
15
14
37
36
11
10
16
7
18
Actuator size C
Chevron seal
Pressurerings
Wiper
16
Chevron seal
Pressurespring
7
ActuatorsizeD,E,F,G,H
Figure 2: Packing gland set
→Pushpackingglandintothetube 8asfarasthestop;clampnipples 6to do this and screw in
packingglandsetwithscrew 18 . Remove screw 18 again.
→OnlyforactuatorsizeC: Lubricate lip seal 37 lightlywithsiliconegreaseOKS1110-3.Placelipseal
andO-ring 36 on screw.
→Mount actuator body 12 ,disksprings 17 and screw 18 on the tube 8.
→Screw 18 withsocketspanner;ensuringthatthedisksprings 17 are in a central position.
→Lubricate spindle 2lightlywithsiliconegreaseOKS1110-3andinsertsuitableassemblysleeveover
spindle thread.
For information about the assembly sleeve see chapter “10Installationtools”.
→Insertspindlethroughnipple 6into actuator and remove assembly sleeve.
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Replacing the seal set
Type 2000, 2002, 2012
OnlyforactuatorsizeC:
→ControlfunctionA: Place intermediate washer 20 andO-ring 21 on spindle.
→ControlfunctionB:Placepressurespring 35 ,intermediatewasher 20 andO-ring 21 on spindle.
OnlyforactuatorsizeD,E:
→ControlfunctionAandI:Placellerpiece 19 and intermediate washer 20 on spindle.
→ControlfunctionB:Placepressurespring 35 and intermediate washer 20 on spindle.
OnlyforactuatorsizeF,G,H:
→ControlfunctionAandI:Placellerpiece 19 ,intermediatewasher 20 andO-ring 21 on spindle.
→ControlfunctionB:Placepressurespring 35 and intermediate washer 20 on spindle.
Allactuatorsizes:
→Lubricatemountingactuatorbody 12 lubricantAmblygonTA.
→Remove old piston seal 23 from pistons 22 cleangrooveandlubricatewell;lubricantAmblygonTA.
→Insertnewpistonring 23 .
→OnlyforactuatorsizeC:Insert pistons 22 andsupportingwasher 24 .
→OnlyforactuatorsizeD,E:Insert pistons 22 ,lightlylubricatedO-ring 21 andsupportingwasher 24 .
OnlyforactuatorsizeF,G,H:
→ControlfunctionAandI: Insert pistons 22 andsupportingwasher 24 .
→ControlfunctionB: Insert pistons 22 ,lightlylubricatedO-ring 21 andsupportingwasher 24 .
Allactuatorsizes:
→Carefully screw in actuator on the swivel plate 3(only put pressure on the upper section of the swivel plate).
→Wet spindle thread 2withspecialadhesiveLOCTITE274andscrewonnut 25 tightlywithawrench..
→Mount position indicator 26 (not actuator size C).
→ControlfunctionA:Usepressuresprings 28 29 .
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Replacing the seal set
Type 2000, 2002, 2012
→OnlyactuatorsizeG,H: Insert washer 40 .
→ForcontrolfunctionBandI:ChangeO-ring 30 .
→ReplaceO-ring 32 todothis,removetransparentcap.
→OnlyactuatorsizeCwithouttransparentcap:Changeself-lockingring 53 andO-ring 32 .
→Lightlylubricatecoverthread,lubricantAmblygonTA.
→Mount cover 31 andscrewtightlywithspecialwrench.
→Clamp body 1.
Donotdamagesealingedgeswhenreplacingtheseal!
→Replacegraphiteseal 5.
→Only for VA body (VA = stainless steel):Lubricate nipple thread 6withKlüberpasteUH196-402.
NOTE!
Damage to the seat contour!
▶Duringinstallation,takecarethatthereisnodamagetotheseatcontour.
▶Observetighteningtorquesaccordingto“Table4”.
→ForcontrolfunctionAandI: Pressurize lower control air connection with compressed air (5 bar).
→Screw in nipple 6with actuator in valve body 1.Observetighteningtorque!
→OnlyforType2002:Usesealingtape.
→Check the valve for function and leaks.
Tighteningtorquesforscrewingthenippleintothevalvebody
DN (mm) Tightening torque (Nm) DN (mm) Tightening torque (Nm)
15 45 40 65
20 50 50 70
25 60 65 70
32 65
Table 1: Valve body tightening torques
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Replacing the packing gland
Type 2000, 2002, 2012
6 REPLACING THE PACKING GLAND
Concerns valves withidentication“R”intheactuatorsizes:F(80mm),
G(100mm),
H (125 mm)
DANGER!
Risk of injury from discharge of medium and release of pressure!
▶Beforeremovingadevice,switchothepressureandventthelines!
Thesealsetforthepackingglandcontains:
Item Description Item Description
13 Chevron seal (7 pieces) 7 Spindleguide
Upper
chevron seal
Upperpressurering
Pressurespring
Lowerpressurering
Lower chevron seal
Spindleguide
Pushingdirection
forpackingglandparts
Actuator size F (R) ActuatorsizesG(R),H(R)
7
13
13
Figure 3: Pushing direction for packing gland parts
WARNING!
Riskofinjuryifthewrongtoolsareused!
▶Toremovetheactuatorfromthevalvebody,useanopen-endwrench,neverapipewrench.
▶Toreplacethepackinggland,useaspecialinstallationwrench(seechapter“10”).
▶Observetighteningtorques!
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Replacing the packing gland
Type 2000, 2002, 2012
NOTE!
Beforethepackingglandcanbereplaced,theactuatormustberemovedfromthevalvebodyandthe
swivel plate removed.
Damage to the seat contour!
▶Whenremovingtheactuator,ensurethatthevalveisintheopenposition.
→Clamp the valve body 1intoaholdingdevice(appliesonlytovalvesnotyetinstalled).
→ForcontrolfunctionAandI:pressurizethelowercontrolairconnectionwithcompressedair(5bar):Valve
opens.
→Placeasuitableopen-endwrenchonthewrenchatofthenipple 6.
→Unscrew actuator on the valve body 1.
→Remove compressed air from the control air connection.
→Knock out pin 4on swivel plate 3withasuitablepinpunch:
pin punch ø 3 mm for spindle diameter 10 mm and
pin punch ø 5 mm for spindle diameter 14 mm.
→Remove swivel plate 3.
→OnlyforactuatorsizeF:Unscrewspindleguide 7with the help of the installation tool and an open-
end wrench.
→OnlyforactuatorsizeG,H:Unscrewspindleguide 7with the help of two open-end wrenches.
Installation wrench
Packinggland
Spindleguide
Spindle
Packingglandtube
Actuator size F (R)
Packinggland
Spindleguide
Spindle
Packingglandtube
ActuatorsizeG(R),H(R)
Figure 4: Replacing the packing gland
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Replacing the packing gland
Type 2000, 2002, 2012
WARNING!
Risk of injury from ejected parts!
Whenthespindleopeningisexposed,theindividualpartsofthepackingglandarepressedoutatanunde-
nedspeedwhenthecontrolairconnectionispressurized.
▶Beforepressurizingwithcontrolair,safeguardtheambientareaofthedischargeopening(e.g.place
spindleonarmbase).
→Pressurize the lower control air connection with 6...8 bar.
→Greasetheindividualpartsofthenewpackingglandwiththesuppliedlubricant(siliconegreaseOKS
1110-3).
→Placetheindividualpartsonthespindleintheprescribeddirectionandsequence.
→Pushpackingglandpackingintothetube 8.
→Screwinspindleguideagainbeforeusingtheinstallationwrench.Observetighteningtorques(“Table2”)!
Spindle diameter (mm) Tightening torques (Nm)
10 6
14 15
Table 2: Spindle guide tightening torques
→Place swivel plate 3on the spindle 2.
→Aligndrillholesoftheswivelplate 3and spindle 2sothattheyareushwithoneanother.
→Support swivel plate 3on the cylindrical part with the help of a prism.
→Insert pin 4into the drill hole.
→Calk pin bores on both sides of the swivel plate 3with chisel or prick punch.
→Clamp body 1.
→Replacegraphiteseal 5.
→Only for VA body (VA = stainless steel):Lubricate nipple thread 6withKlüberpasteUH196-402.
→ForcontrolfunctionAandI: Pressurize lower control air connection with compressed air (5 bar).
→Screw in nipple 6with actuator in valve body 1.Observetighteningtorques.
Tighteningtorquesforscrewingthenippleintothevalvebody
DN (mm) Tightening torques (Nm) DN (mm) Tightening torques (Nm)
15 45 40 65
20 50 50 70
25 60 65 70
32 65
Table 3: Valve body tightening torques
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Replacing the valve set
Type 2000, 2002, 2012
7 REPLACING THE VALVE SET
DANGER!
Danger – high pressure!
▶Turnothepressureandventthelinesbeforelooseninglinesorvalves.
Risk of injury from improper maintenance!
▶Maintenance may be performed by authorized technicians only!
▶Toscrewonorunscrewvalvebodyoractuator,useanopen-endwrench,neverapipewrench.
▶Observetighteningtorques.
Requiredparts:
Item Description
3SwivelplatewithPTFEseal
4 Pin
5Graphiteseal(packed)
3* Sleeves (only valve with spindle diameter 14 mm)
→Mount valve 1on the body.
→ControlfunctionAandI: Pressurize lower control air connection with compressed air (5 bar).
→Unscrew actuator on the valve body 1.
→Vent actuator.
→Support swivel plate 3withthehelpofaprism,knockoutpin 4with a pin punch and pull out swivel plate.
→Mount new swivel plate 3alignandsecurewithnewpin 4.
NOTE!
Forvalveswith“R”sleeves 3* ,insertinswivelplateandaligndrilledholes.
Pin
Swivel plate
Graphiteseal
Figure 5: Replacing the valve set
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Replacing the valve set
Type 2000, 2002, 2012
→Calk pin bores on both sides of the swivel plate with chisel or prick punch.
→Carefullyremoveoldgraphiteseal 5from the body 1.
→Insertnewgraphiteseal 5.
→Only for VA body (VA = stainless steel):Lubricate nipple thread 6withKlüberpasteUH196-402.
→OnlyforType2002:Usesealingtape.
NOTE!
Damage to the seat contour!
▶Duringinstallation,takecarethatthereisnodamagetotheseatcontour.
▶Observetighteningtorquesaccordingto“Table4”.
→ForcontrolfunctionAandI: Pressurize lower control air connection with compressed air (5 bar).
→Screw in valve actuator with nipple 6into the body.
→OnlyforcontrolfunctionA(CFA): Rescrew cover 31 with special wrench.
→Check the valve for function and leaks.
Tighteningtorquesforscrewingthenippleintothevalvebody
DN (mm) Tightening torques (Nm) DN (mm) Tightening torques (Nm)
15 45 40 65
20 50 50 70
25 60 65 70
32 65
Table 4: Valve body tightening torques
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Replacing the valve seat
Type 2000, 2002, 2012
8 REPLACING THE VALVE SEAT
Remove the actuator from the valve body
→Clampthevalvebodyinaholdingdevice.
NOTE!
Damage to the seat seal or the seat contour!
▶Whenremovingtheactuator,ensurethatthevalveisinopenposition.
→ControlfunctionAandI:pressurizethelowercontrolairconnectionwithcompressedair(5bar):valve
opens.
→Usingasuitableopen-endwrench,placethewrenchatonthetube.
→Unscrew the actuator from the valve body.
→Carefullyremoveoldgraphitesealfromthevalvebody.
Replacing valve seat
→Unscrewoldvalveseatusingtheinstallationtoolandopen-endwrench.
Information on the assembly tool can be found in chapter “10Installationtools”.
→Cleanthreadandsealingsurfaceinthebodyusingcompressedair.
→Select tool insert and screw into the installation tool.
→Attach new valve seat to the installation tool.
→Greasethreadwithalubricant(e.g.KlüberpasteUH196-402).
→Place attached valve seat on the body thread and screw on by hand.
→Usingatorquewrench,tightentothespeciedtighteningtorque(see“Table5”).
Installation tool
Toolinsert
(accordingtonominal
width of seat)
Valve seat
Figure 6: Replacing the valve seat
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