Valves and valve actuation – Balanced valves – Reciprocating
Reexamination Certificate
2005-02-08
2005-02-08
Look, Edward K. (Department: 3754)
Valves and valve actuation
Balanced valves
Reciprocating
C137S625300, C137S625330
Reexamination Certificate
active
06851658
ABSTRACT:
An ANSI Leakage Class V control valve having consistent shut off characteristics with a reduced actuator force required to open and close the valve is provided. The trim arrangement of the control valve includes a valve cage having a multi-contoured inner surface. The multi-contoured inner surface can include a plurality of surfaces. The multi-contoured surface can include first, second, and third perimeter surfaces, and a first transition surface disposed between and coupling the first and second perimeter surfaces, and a second transition surface disposed between and coupling the second and third perimeter surfaces. The valve also includes a valve plug disposed at one end of a valve stem. The valve plug controls the fluid flow through the valve. The valve plug includes an opening through the plug for equalizing pressure across the valve plug. An annular channel is formed within a wall of the valve plug and is sized to accommodate a sealing ring. The sealing ring engages the second perimeter surface to form a fluid seal that substantially hinders fluid leakage through the valve.
REFERENCES:
patent: 3648718 (1972-03-01), Curran
patent: 3990475 (1976-11-01), Myers
patent: 4397331 (1983-08-01), Medlar
patent: 5018703 (1991-05-01), Goode
patent: 5113908 (1992-05-01), Steinke
patent: 5236014 (1993-08-01), Buls et al.
patent: 0 167 252 (1986-01-01), None
patent: 0 573 399 (1993-12-01), None
patent: 1 569 261 (1980-06-01), None
International Search Report for PCT/US03/39860, issued Apr. 19, 2004.
Bush Donald Ray
Eggleston, Jr. Cecil J.
Fitzgerald William V.
Helfer Wade J.
Fisher Controls International Inc.
Marshall & Gerstein & Borun LLP
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