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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <2>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <4>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <6>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <8>
MAN B&W Diesel
© MAN B&W Diesel
Piston, Air Spring
Air Piston
Conical Locking Ring
Flange
Relief holes
Teflon ring
Teflon ring withback-up O-ring
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <10>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Spindle Rotation Check
Rod for checking spindle rotation
Reaches contact with the airpiston by activation.
Note!The rod must only be activatedfor shorter periods
2006.02.01 (4140 / PWN) <13>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Exhaust valve system
2006.02.01 (4140 / PWN) <16>
MAN B&W Diesel
© MAN B&W Diesel
Safety Valve
Safety Valve:Adjustment of openingpressure: 21 bar
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <18>
MAN B&W Diesel
© MAN B&W Diesel
Exhaust valve system
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
Non return valve
Tohydraulicsystem
Camshaft oil
Back pressure valve for air spring (17.5 or 21 bar)
Adjusting valve(for control of leakage)
Safety valve for hydraulic system (300 bar)
Valves in exhaust valve system
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MAN B&W Diesel
© MAN B&W Diesel
Piston, Air Spring
Safety Valve
or
Relief holes
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <26>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <28>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Actuator Piston
Main Piston
Damper Piston
Distance Disc
Exhaust Valve Spindle
R0.1 max (sharp edged)
L
Crossbar (Distance: 47-51.2mm)
Orifice (0.7mm)
Piston Rings
2006.02.01 (4140 / PWN) <30>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Actuator Piston New Standard
Damper Piston
Positioning element
Main Piston
Compression pressure will beunaffected:
•By grinding of the exhaust valve seating throughout the lifetime of the engine.
•During cold-running of the engine.
2006.02.01 (4140 / PWN) <33>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <36>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <39>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
For new Plant Specification after April 2002
Sealing oil system - PrincipleSealing oildosage unit Consumption ~ 1l/day/cylinder
Supply from’Leak oil chamber’
New air cylinder
New spindle guide
Single sealing ring
Sealing oil
2006.02.01 (4140 / PWN) <42>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Exhaust Valve Sealing Oil Dosage Unit
1. Vertical cross section, pressure low
2006.02.01 (4140 / PWN) <44>
MAN B&W Diesel
© MAN B&W Diesel
2. Horizontal cross section, pressure low. Needle connected to output.
Exhaust Valve Sealing Oil Dosage Unit
Spring tension 4 – 5 bar
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
3. Pressure high. Needle connected to input and charged with oil.
Exhaust Valve Sealing Oil Dosage Unit
10 – 15 bar oil pressure.
Spring tension 4 – 5 bar
2006.02.01 (4140 / PWN) <46>
MAN B&W Diesel
© MAN B&W Diesel
4. Pressure decreasing. Needle charge not released yet.
Exhaust Valve Sealing Oil Dosage Unit
Spring tension 4 – 5 bar
10 – 15 bar oil pressure.
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
5. Pressure low. Needle connected to output, charge delivered.
Exhaust Valve Sealing Oil Dosage Unit
2006.02.01 (4140 / PWN) <73>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <75>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <82>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Small dent marks on the spindle seating are acceptable and need NOT to be ground away if they don’t make blow-by.
2006.02.01 (4140 / PWN) <85>
MAN B&W Diesel
© MAN B&W Diesel
Small dent marks on the seating are acceptable and need NOT to be ground away if they don’t make blow-by.
K98MC/ME
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <87>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <98>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <101>
MAN B&W Diesel
© MAN B&W Diesel
Exhaust Valve Actuator
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <104>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <108>
MAN B&W Diesel
© MAN B&W Diesel
Areas for possible improvements on the MC Exhaust Valve1983 - 2005
K90MCK98MC
Self-adjusting damper
Cast iron/high spindle g.
HVOF
Modified cooling
Controlled oil level
Cr sealing ring
U-seal
DuraSpindle
Hardened steel W-seat
Closing damper
Spindle guide
Spindle stem
Water cooling
Sealing system
Sealing ring
Viton sealing
Spindle seat
Bottom piece seat
Improved ItemsItems
MC EXHAUST VALVE
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <110>
MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
1983 - 1992: 26 - 50 MC Cooled Alloy 5060 - 90 MC Cooled Stellite 6
1992 – 1997:26 - 50 MC Cooled Alloy 5060 - 90 MC Semi-cooled hard. steel
1997 - 2000:26 - 42 MC Cooled hard.steel 46 - 98 MC Semi-cooled hard. steel
2000 – :26 - 42 MC Cooled W-seat 46 - 98 MC Semi-cooled W-seat
Bottom piece for engine types: K/L/S-MC/-C/-S
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <112>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
<113>
MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
Chamber seat W-seat
2006.02.01 (4140 / PWN) <114>
MAN B&W Diesel
© MAN B&W Diesel
The longer lifetime on the seat area is achievedwith the new geometry of the W-seat, whichretains the temperature reducing features of thechamber seat and combines them with the benefit of the two narrow concentric contact areas.
The effect is that all carbon particles which aretrapped between the spindle and bottom pieceare crushed and squeezed out and thereforeeliminated without giving rise to any appreciablerisk dents.
The spindle and seat are fit for further use provided that :
• There is contact along the entire inner circumference of the seat.
• There are no blow-by tracks across the inner part of the seats.
Exhaust Valve Spindle & Bottom Piece 98MC/MC-C – 26MC
16,000 h between overhauls60-100,000 h lifetime for spindle> 30,000 h lifetime for bottom piece
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <117>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <119>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <121>
MAN B&W Diesel
© MAN B&W Diesel
Bottom PieceW-Seat
U-Type Sealing Ring:
Heat the sealing ring in 100°C hotwater for at least five minutesbefore mounting
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Bottom Piece
References of W-seatsrunning for more than 36000hours without any grindingand only very small dent marks
U-type sealing ring(Teflon with a spring back-up)
Hole for indication of coolingwater leakage from thelowermost sealing ring or gas leakage from the combustion chamber
Connect compressed air to the air spring to keep the exhaust valve closed during mounting
2006.02.01 (4140 / PWN) <123>
MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
Valve spindle for engine types: K/L/S-MC/-C/-S1983 - 1992: 26 - 50 MC Alloy 5060 - 90 MC Stellite 6
1992 – 2002:26 - 50 MC Alloy 50S50MC / 60 - 98 MC Nimonic
2002 - :26 - 50 MC DuraSpindle S50MC / 60 - 98 MC Nimonic
1983 – 1996: Cr stem coating
1996 - : HVOF stem coating
(INCO 625 on request)
Cr (0.25 mm) HVOF (0.15 mm)
Stellite 6
SNCrW
Nimonic
Alloy 50
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <125>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <127>
MAN B&W Diesel
© MAN B&W Diesel
Exhaust Valve Nimonic Spindle
Base Material: Nimonic 80A
HVOF-coatingFormation of dent marks is aninevitable consequence of service onheavy fuel oil.
Dent marks may appear harmful, butwill in general have no influence onthe performance of the exhaust valveseat.
If indications of blow-by are found,then the seat must be ground.
Vane wheel for gasdriven spindle rotation
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <131>
MAN B&W Diesel
© MAN B&W Diesel
Exhaust Valve Spindle - Stem
HVOF spraying on valve stem
Ni-Cr-W valve steel
Ni-Cr + Cr3C2
150 µm
HVOF: High Velocity Oxy-Fuel Process
Coating applied on the exhaust valve stem onlyHighly wear-resistant mixtureof metalcarbide and superalloyThermally sprayed coatingThickness: about 0.25 mm
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
HVOF - ring
Cr - ring
Valve spindle stem sealing ring
2006.02.01 (4140 / PWN) <135>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <137>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <139>
MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
K90MC W-seat in combination with Nimonic spindles, 36.000 hrs service
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Design
Features:Damped valve closing by means of oil cushion
New sealing air chamber suitable for air as well as oil sealing medium
Hardened steel chamber-type bottom piece
HVOF coating on Nimonic spindles
Improvements:Mechanical stop for spindle movement combined with safety valve in actuator
Smaller bottom piece
Cooling water connection between cylinder cover and valve housing through bores in valve housing
Strengthened design of damper piston
Cast iron liner in hydraulic cylinders
Cast iron single bush for valve stem
Verification:Calculation and service tests
Exhaust valve K90MC-C K98MC-C
2006.02.01 (4140 / PWN) <141>
MAN B&W Diesel
© MAN B&W Diesel
Exhaust Valve Bottom Piece
K98MC, K98MC-C
Original design Modified design
New tool for handling(instead of bolt assembly)2 pcs.
Increased diameter0.15° taper
Decreased diameter
HardenedW-seat
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
MAN B&W Diesel A/SRolled exhaust valve spindles
”DuraValve”
2006.02.01 (4140 / PWN) <153>
MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
Welding and rolling preparation of DuraSpindle
Welded Ni-base alloy
Inconel 718 / Rene22010 t
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MAN B&W Diesel
© MAN B&W Diesel
Exhaust Valve Spindle - Plate
Inconel 718/Rene 220
Ni-Cr-W valve steel
MIG/MAG welding on valve seat
2006.02.01 (4140 / PWN) <155>
MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
Rolled seat area of 50MC DuraSpindle
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
Exhaust valve – Rolling equipment
• BackgroundThe roller is pressed against a rotating spindle at a pressure of 10 tons. The combination of the deformationand the subsequent heating in the oven imparts a hardness to the interial which has not been seen before.
2006.02.01 (4140 / PWN) <157>
MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
Section of rolled and heat treated 35 MC DuraSpindle seat
Hardness distribution of section2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
Nimonic spindle & chamber seat, S60MC, 25.500 service hrs
DuraSpindle & chamber seat, S60MC, 33.900 service hrs
2006.02.01 (4140 / PWN) <159>
MAN B&W Diesel
© MAN B&W Diesel
MC EXHAUST VALVE
Nimonic spindle & W-seat, S60MC, 25.500 service hrs
DuraSpindle & W-seat, S60MC,33.900 service hrs
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <165>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <168>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <170>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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© MAN B&W Diesel 2006.02.01 (4140 / PWN) <172>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <174>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <176>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <178>
MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN) <191>
MAN B&W Diesel
© MAN B&W Diesel
Thank you for
your attention
Thank you for
your attention
MAN B&W Diesel A/S
Preben Noeies
2006.02.01 (4140 / PWN)
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MAN B&W Diesel
© MAN B&W Diesel 2006.02.01 (4140 / PWN)