Valves and valve actuation – Reciprocating valve – Particular head and seat cooperation
Reexamination Certificate
2006-05-09
2009-06-02
Bastianelli, John (Department: 3753)
Valves and valve actuation
Reciprocating valve
Particular head and seat cooperation
C251S359000, C029S890122, C029S890129, C029S888300, C137S015180, C137S902000
Reexamination Certificate
active
07540470
ABSTRACT:
Hot-isostatic-pressure (HIP) is used to make substantially nonporous cemented carbide inlays on metal substrates. A radiused shell preform typically comprising at least one metal carbide and at least one nonvolatile cement is shaped as a rigid frusto-conical shell having a substantially uniform thickness and a predetermined radius on every edge. HIP pressure is applied via a conforming adjustable sliding element to compress the preform against a conforming substrate. Surfaces of the conforming adjustable sliding element and conforming substrate, and/or the radiused shell preform, may in certain embodiments be coated substantially uniformly with at least one nonvolatile cement. Space around a radiused shell preform is evacuated without the need to totally enclose the radiused shell preform and its substrate in a can. Certain embodiments provide for leak testing of welded seals prior to application of HIP, and other embodiments make the use of welded seals unnecessary.
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Bastianelli John
Gilstad Dennis W.
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