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US 10,047,710 B2Granted
Method for refurbishing a valve seat in a fuel injector assembly
AssigneeDetroit Diesel Corporation
InventorsRoman F. Kosiorek, Terrance G. Cunningham
Life of this patent
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Abstract
A method of refurbishing a fuel injector body valve seat. The method includes removing a poppet valve from the valve bore guide, machining the bore and valve seat to remove cavitation, machining to create an undercut a the stress riser, nitriding the valve bore guide and radiusing fuel passage to a sufficient depth to restore hardness thereto.
Claims2
A method for refurbishing a fuel injector;
- said fuel injector having a body, a solenoid controlled poppet valve located in a valve bore guide in said body adapted to cooperatively engage a valve seat surface in said body;
- said bore intersecting a fuel passage at an angle to form a stress riser said method comprising:
- removing said poppet valve from said valve bore guide;
- machining said bore and valve seat to remove cavitation;
- machining said fuel passage to increase a radius of the fuel passage with an undercut at said stress riser;
- radiusing the fuel passage at said stress riser and undercut with abrasive flow technology;
- nitriding said valve bore guide and radiused fuel passage to a sufficient depth to restore hardness thereto;
- and
- inserting a poppet valve guide seat sleeve into said valve bore guide of a sufficient height to act as a valve seat.
6 more elements
Dependencies are inferred from the claim text.