Process For Hardfacing of Bore and Seat Face Intersection on Gate Valve
First Claim
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1. 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.
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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.
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Citations
14 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of treating a valve comprising:
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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.
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10. A valve comprising:
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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. - View Dependent Claims (11, 12, 13, 14)
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Specification