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- Valve_seat abstract "The valve seat in an internal combustion gasoline or diesel engine is the surface against which an intake or an exhaust valve rests during the portion of the engine operating cycle when that valve is closed. The valve seat is a critical component of an engine in that if it is improperly positioned, oriented, or formed during manufacture, valve leakage will occur which will adversely affect the engine compression ratio and therefore the engine efficiency, performance (horsepower), exhaust emissions, and engine life.Valve seats are often formed by first press-fitting an approximately cylindrical piece of a hardened metal alloy, such as Stellite, into a cast depression in a cylinder head above each eventual valve stem position, and then machining a conical-section surface into the valve seat that will mate with a corresponding conical-section of the corresponding valve. Generally two conical-section surfaces, one with a wider cone angle and one with a narrower cone-angle, are machined above and below the actual mating surface, to form the mating surface to the proper width (called \"narrowing\" the seat), and to enable it to be properly located with respect to the (wider) mating surface of the valve, so as to provide good sealing and heat transfer, when the valve is closed, and to provide good gas-flow characteristics through the valve, when it is opened. Inexpensive engines may have valve seats that are simply cut into the material of the cylinder head or engine block (depending on the design of the engine). Some newer engines have seats that are sprayed on rather than being pressed into the head, allowing them to be thinner, creating more efficient transfer of heat through the valve seats, and enabling the valve stems to function at a lower temperature, thus allowing the valve stems (and other parts of the valvetrain) to be thinner and lighter.There are several ways in which a valve seat may be improperly positioned or machined. These include incomplete seating during the press fitting-step, distortion of the nominally circular valve seat surfaces such they deviate unacceptably from perfect roundness or waviness, tilt of the machined surfaces relative to the valve guide hole axis, deviation of the valve seat surfaces from concentricity with the valve guide holes, and deviation of the machined conical section of the valve seat from the cone angle that is required to match the valve surface. Automated quality control of inserted and machined valve seats has traditionally been very difficult to achieve until the advent of digital holography which has enabled high-definition metrology for measuring all of these listed deviations.".
- Valve_seat thumbnail Valve_seat_inserts_(NPR).jpg?width=300.
- Valve_seat wikiPageID "7863619".
- Valve_seat wikiPageLength "3257".
- Valve_seat wikiPageOutDegree "26".
- Valve_seat wikiPageRevisionID "628730968".
- Valve_seat wikiPageWikiLink Alloy.
- Valve_seat wikiPageWikiLink Category:Engine_valves.
- Valve_seat wikiPageWikiLink Compression_ratio.
- Valve_seat wikiPageWikiLink Concentric.
- Valve_seat wikiPageWikiLink Cone.
- Valve_seat wikiPageWikiLink Cylinder_(geometry).
- Valve_seat wikiPageWikiLink Cylinder_head.
- Valve_seat wikiPageWikiLink Diesel_engine.
- Valve_seat wikiPageWikiLink Digital_holography.
- Valve_seat wikiPageWikiLink Engine_efficiency.
- Valve_seat wikiPageWikiLink Exhaust_gas.
- Valve_seat wikiPageWikiLink Exhaust_system.
- Valve_seat wikiPageWikiLink Hardening_(metallurgy).
- Valve_seat wikiPageWikiLink High-definition_metrology.
- Valve_seat wikiPageWikiLink Horsepower.
- Valve_seat wikiPageWikiLink Intake.
- Valve_seat wikiPageWikiLink Interference_fit.
- Valve_seat wikiPageWikiLink Internal_combustion_engine.
- Valve_seat wikiPageWikiLink Spark-ignition_engine.
- Valve_seat wikiPageWikiLink Stellite.
- Valve_seat wikiPageWikiLink Valve.
- Valve_seat wikiPageWikiLink Valve_leakage.
- Valve_seat wikiPageWikiLink Valvetrain.
- Valve_seat wikiPageWikiLink Waviness.
- Valve_seat wikiPageWikiLink File:Valve_seat_inserts_(NPR).jpg.
- Valve_seat wikiPageWikiLinkText "Valve seat".
- Valve_seat wikiPageWikiLinkText "seated".
- Valve_seat wikiPageWikiLinkText "seats".
- Valve_seat wikiPageWikiLinkText "valve seat".
- Valve_seat wikiPageUsesTemplate Template:Reflist.
- Valve_seat subject Category:Engine_valves.
- Valve_seat hypernym Surface.
- Valve_seat type Bone.
- Valve_seat comment "The valve seat in an internal combustion gasoline or diesel engine is the surface against which an intake or an exhaust valve rests during the portion of the engine operating cycle when that valve is closed.".
- Valve_seat label "Valve seat".
- Valve_seat sameAs Q3486060.
- Valve_seat sameAs Siège_de_soupape.
- Valve_seat sameAs 밸브_시트.
- Valve_seat sameAs m.026gqh9.
- Valve_seat sameAs Q3486060.
- Valve_seat wasDerivedFrom Valve_seat?oldid=628730968.
- Valve_seat depiction Valve_seat_inserts_(NPR).jpg.
- Valve_seat isPrimaryTopicOf Valve_seat.