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Valve seats

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Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001123
EISBN: 978-1-62708-214-3
... Abstract Extensive cracking was found in a batch of die-cast ZAMAK 3 solenoid valve seats during commissioning of the system in which they were installed. Scanning electron microscopic and chemical analyses conducted on one of the failed valve seats showed that the composition of the alloy...
Book Chapter

Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0090947
EISBN: 978-1-62708-225-9
... Abstract Valve seats fractured during testing and during service. The seats were machined from grade 11L17 steel and were surface hardened by carburization. Investigation (visual inspection, hardness testing, 59x SEM images, and 2% nital etched 15x cross sections) supported the conclusion...
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Published: 01 January 2002
Fig. 7 Valve seat fractures ( example 5 ). (a) View of the seat fracture surface with intergranular near-surface features from the carburizing heat treatment. Scanning electron micrograph. 59×. (b) Cross section showing the case depth and the blunting of a secondary bending crack More
Image
Published: 01 June 2019
Fig. 1 Valve seat fractures. (a) View of the seat fracture surface with intergranular near-surface features from the carburizing heat treatment. Scanning electron micrograph. 59×. (b) Cross section showing the case depth and the blunting of a secondary bending crack by the ductile core More
Image
Published: 15 January 2021
Fig. 7 Valve seat fractures (Example 5). (a) View of the seat fracture surface with intergranular near-surface features from the carburizing heat treatment. Scanning electron micrograph. Original magnification: 59×. (b) Cross section showing the case depth and the blunting of a secondary More
Image
Published: 01 January 2002
Fig. 22 Original and improved designs of a 17-7 PH stainless steel valve-seat retainer spring. As originally designed, the inner tabs on the spring broke off as a result of fatigue, and the outer tab exhibited wear. More
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Published: 01 January 2002
Fig. 24 Valve seating face showing a series of ridges and valleys formed circumferentially around the axis of the valve More
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Published: 01 December 1992
Fig. 1 Solenoid valve seat assembly, showing extensive cracking. More
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Published: 30 August 2021
Fig. 36 Original and improved designs of a 17-7 PH stainless steel valve-seat retainer spring. As originally designed, the inner tabs on the spring broke off as a result of fatigue, and the outer tab exhibited wear More
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Published: 01 June 2019
Fig. 2 The valve seat and shaft assembly in the as-received condition. More
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Published: 01 June 2019
Fig. 6 Microstructure of the interface between the valve seat and the welded tip. More
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Published: 01 June 2019
Fig. 7 Microstructure of the tip welded on the valve seat. More
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Published: 01 June 2019
Fig. 11 Zn-depleted region in the welded tip of the valve seat. More
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Published: 01 June 2019
Fig. 1 Original and improved designs of a 17-7 PH stainless steel valve-seat retainer spring. As originally designed, the inner tabs on the spring broke off as a result of fatigue, and the outer tab exhibited wear. More
Image
Published: 01 June 2019
Fig. 2 The crack (arrow) extended at the exhaust valve seat counterbore where the failure originated ( Fig. 1 ). More
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Published: 15 January 2021
Fig. 34 Valve seating face showing a series of ridges and valleys formed circumferentially around the axis of the valve More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001684
EISBN: 978-1-62708-225-9
... Abstract The steam tug Hercules was an ocean-going and bay tug for 55 years before being retired. It is now being restored by the National Park Service. A broken steam valve was obtained for microstructural examination. The body was gray cast iron, and the stem and seat were brass...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001374
EISBN: 978-1-62708-215-0
... included use of a higher-copper brass, cupronickel, or Monel for the valve seats and stems and operation of the valves in either the fully opened or closed position. Air-conditioning equipment Heating equipment UNS C35300 C36000 UNS C36000 Erosion - corrosion Erosive wear Background Two...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.auto.c9001182
EISBN: 978-1-62708-218-1
... was welded on to the valve seat. Fracture was a consequence of fatigue corrosion cracking, itself strongly promoted by the presence of sulphur compounds. The origin of these corrosive sulphur compounds could not be explained. Automotive components Exhaust valves Sulfur compounds Valve steel...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0045992
EISBN: 978-1-62708-225-9
... was specified to be case hardened to 55 to 60 HRC, with a case depth of 0.6 to 0.9 mm (0.025 to 0.035 in.); the hardness of the mating valve seat was 40 HRC. Analysis showed that the fracture occurred through two 8 mm (0.313 in.) diam holes at the narrowest section of the poppet. The valve continued to operate...