The Development of Sintered Materials Containing Dispersed Die Steel Hard Particles for Intake Valve Seat Inserts

2001 ◽  
Author(s):  
Koichiro Hayashi ◽  
Yoshimasa Aoki
Keyword(s):  
Intake Valve ◽  
Valve Seat ◽  
Die Steel ◽  
Hard Particles ◽  
Valve Seat Inserts ◽  
Sintered Materials

P/M Valve Seat Inserts: Air Quenching and Characterization

2017 ◽  
Author(s):  
Maurilio Pereira Gomes ◽  
Igor Santos ◽  
Camila Couto ◽  
Cristiano Mucsi ◽  
Jesualdo Luiz Rossi ◽  
...  
Keyword(s):  
Valve Seat ◽  
Valve Seat Inserts

The Erosion-Corrosion of Intake Valve Sealing Surfaces Due to the Formation of Lubricating Oil Deposits

2005 ◽  
Author(s):  
John J. Truhan ◽  
Karren L. More ◽  
Roger S. Rangarajan
Keyword(s):  
Lubricating Oil ◽  
Metal Loss ◽  
Intake Valve ◽  
Metal Oxidation ◽  
Partial Loss ◽  
Valve Seat ◽  
Surface Cracking ◽  
Combustion Gases ◽  
Erosion Corrosion ◽  
Valve Sealing

Intake valves from natural gas-fired reciprocating engines displaying “torching” were examined to determine their failure mechanism. The principal features of the “torched” valves include a relatively thick black deposit on the tulip area of the valve extending to the sealing surface, partial loss of those deposits in various locations, and localized metal loss, oxidation and/or surface cracking in the spalled regions. Electron microprobe, scanning electron microscopy, and optical microscopy were employed to characterize the deposit formation and metal loss mechanisms. The initial cause of the torching appears to be due to the localized spallation of a loosely adherent (Ca,Zn) phosphate oil deposit adjacent to the valve/seat seal which creates a channel of hot, high velocity combustion gases. Within the torched area, significant metal oxidation and metal recession due to erosion/corrosion was observed on the valve sealing face, creating a relatively wide gap where a valve/seat seal should be. In areas where torching is not evident on the valve sealing surface, no appreciable metal recession (but limited metal oxidation) was observed.

Diesel Engine Performance Improvement for Constant Speed Application Using CFD

2017 ◽  
Author(s):  
Balasaheb S. Dahifale ◽  
Anand S. Patil
Keyword(s):  
Combustion Chamber ◽  
Fuel Consumption ◽  
Performance Improvement ◽  
Test Data ◽  
Engine Performance ◽  
Exhaust Valve ◽  
Fine Tuning ◽  
Intake Valve ◽  
Valve Seat ◽  
Load Conditions

The detailed investigation of flow behavior inside the combustion chamber and performance of engine is most challenging problem due to constraints in Experimental Data collection during testing; However, Experimental testing is essential for establishment of correlation with CFD Predictions. Hence, the baseline engine was tested at different load conditions and validated with CFD results, before it was optimized for performance improvement. The objective of the CFD Prediction was not only to optimize performance (Fuel Efficiency, Power, Torque, etc.) & Emissions Reduction, but also to assess feasibility of Performance Upgrade Potential. In the present CFD study, surface mesh and domain was prepared for the flame face, intake valve, intake valve seat, exhaust valve, exhaust valve seat and liner for closed volume cycle, between IVC and EVO using CFD code VECTIS. Finally simulations for three different load conditions were conducted using VECTIS solver. Initially, in-cylinder pressure vis a vis crank angle prediction was carried out for 100%, 75% and 50% load conditions. Then the fine tuning of (P-ϴ) diagram for different load conditions was conducted by varying different combustion parameters. Further, the engine performance validation was carried out for rated and part load conditions in terms of, IMEP, BMEP, break specific fuel consumption and power output, while NOx mass fractions were used to convert the NOx to g/kWh for comparison of emission levels with the test data. Finally optimized re-entrant combustion chamber and modified valve timing with optimum fuel injection system simulation was carried out to achieve target performance with reduced fuel consumption. A 3D CFD result showed reduction in BSFC and was in close agreement with the test data.

Sintered Valve Seat Inserts – Microstructural Characterisation

2006 ◽  
pp. 65-70
Author(s):  
E.S. Jesus Filho ◽  
Edilson Rosa Barbarosa Jesus ◽  
Lucio Salgado ◽  
S.L. Jesus ◽  
M.A. Colosio ◽  
...  
Keyword(s):  
Valve Seat ◽  
Microstructural Characterisation ◽  
Valve Seat Inserts

Machining and Mechanical Characterisation of PM Materials for Valve Seat Inserts

2005 ◽  
pp. 79-85
Author(s):  
E.S. Jesus Filho ◽  
Lucio Salgado ◽  
S.L. de Jesus ◽  
J.L. Rossi ◽  
M.A. Colosio ◽  
...  
Keyword(s):  
Valve Seat ◽  
Mechanical Characterisation ◽  
Valve Seat Inserts

New Materials for Valve Seat Inserts

MTZ worldwide ◽  
2015 ◽  
Vol 76 (11) ◽  
pp. 30-35
Author(s):  
Denis Christopherson ◽  
Frank Zwein
Keyword(s):  
New Materials ◽  
Valve Seat ◽  
Valve Seat Inserts

scholarly journals Microstructural characterization of air quenched valve seat inserts obtained with AISI D2 tool steel

2017 ◽  
Author(s):  
M. P. Gomes ◽  
I. P. Santos ◽  
C. P. Couto ◽  
E. G. Betini ◽  
M. A. Colosio ◽  
...  
Keyword(s):  
Tool Steel ◽  
Microstructural Characterization ◽  
Valve Seat ◽  
Aisi D2 ◽  
Valve Seat Inserts ◽  
Aisi D2 Tool Steel

High thermal conductivity valve seat inserts and guides

MTZ worldwide ◽  
2018 ◽  
Vol 79 (9) ◽  
pp. 42-49
Author(s):  
Philippe Beaulieu ◽  
Sascha Orazem ◽  
Gunther Reissinger ◽  
David Woodward
Keyword(s):  
Thermal Conductivity ◽  
High Thermal Conductivity ◽  
Valve Seat ◽  
Valve Seat Inserts
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