Process For Hardfacing of Bore and Seat Face Intersection on Gate Valve
AssigneeVecto Gray Inc.
InventorsDavid D. Comeaux, Salvador G. Maldonado, Eddie J. Mayea, Mahesha Udipi
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Abstract
A method of treating a valve with a coating, such as hardfacing, that includes depositing the coating with a spray stream that is oriented perpendicular to the surface being treated. The method further includes applying a coating of uniform thickness onto lateral surfaces of a valve seat, a portion of the valve seat bore, and the interface between a valve seat lateral surface and the valve seat bore. The valve seat bore can include an annular recess formed to receive a layer of coating.
Claims14
A method of treating a valve seat having a bore, a seat face, and a chamfered edge joining the bore and seat face, the method comprising:
- a. forming a counter bore from the seat face into the bore that defines a recess;
- and
- b. directing a metal coating spray stream at chamfered edge, so that a metal coating is applied on the chamfered edge, the seat face, and into the recess.
A method of treating a valve comprising:
- directing a metal coating spray stream along a line substantially normal to a first location on a curved surface of the valve;
- and
- contacting the first location on the curved surface of the valve with the metal coating spray stream, so that a metal coating is deposited on the valve.
A valve comprising:
- a valve body;
- an axial passage formed through the body;
- a valve gate having an aperture selectively registerable with the passage;
- an annular valve seat having a lateral side in contact with the valve gate and a bore registered with the passage;
- a chamfered edge on the valve seat spanning from a seat face into the bore;
- and
- a metal coating on the seat side, the chamfered surface, and along the bore wall past the chamfered edge.
Dependencies are inferred from the claim text.