Valves and valve actuation – Reciprocating valve – Particular head and seat cooperation
Reexamination Certificate
2006-09-19
2006-09-19
Jacyne, J. Casimer (Department: 3751)
Valves and valve actuation
Reciprocating valve
Particular head and seat cooperation
C251S120000
Reexamination Certificate
active
07108244
ABSTRACT:
A valve arrangement (10) for reducing the instability of fluid flow in a compressible flow governor valve includes a cutoff plug (12) with a lateral concave surface (14) and an end portion (16) having a substantially circular cross section, and a seat (30) with a convex surface (32). The lateral concave surface (14) and the end portion (16) of the cutoff plug (12) define an abrupt cutoff corner (18). The radius (re) of the end portion (16) of the cutoff plug (12) is less than the radius (Rs) of the seat (30). The radius of curvature (R) of the seat (30) is less than the radius of curvature (rq) of the lateral concave surface (14) of the cutoff plug (12). The configuration of the cutoff plug (12) and seat (30) enhances the annular flow pattern beneath the cutoff plug (12) at all lift positions thus reducing flow instability.
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Pluviose, M., Stabilization of Flow Through Steam-Turbine Control Valves, Transactions of the ASME, Oct. 1989, pp. 642-646, vol. 111, presented at the Joint ASME/IEEE Power Generation Conference, Portland, Oregon, Oct. 19-23, 1986.
Elliott Turbomachinery Co., Inc.
Jacyne J. Casimer
The Webb Law Firm
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