Valves and valve actuation – Rotary valves – Butterfly
Patent
1975-04-21
1976-12-14
Weakley, Harold W.
Valves and valve actuation
Rotary valves
Butterfly
251317, F16K 122
Patent
active
039971422
ABSTRACT:
A rotary valve for providing control of fluid flow throughout a wide range of pressures and temperatures. The valve includes a pressure sensitive and temperature responsive annular yieldable seat that cooperates with the valve's flow control element to establish a fluid seal, and a temperature responsive rigid energizer ring for maintaining both a radial and an axial load on the seat at all temperatures. The valve seat includes an annular, radially outwardly extending leg that is held in position against a radial surface of the valve's body by the energizer ring, and at least one pressure sensitive annular sealing lip that extends in a generally axial direction from the leg and in contact with the valve's flow control element when the valve is closed. The energizer ring has a generally wedge-shaped cross-sectional configuration and is held in position in the valve body by a retainer ring that is releasably secured, as by screws, to the valve body for quick and easy servicing of the seat. The energizer ring has a frusto-conical radial surface that cooperates with a corresponding surface on the retainer ring to maintain the energizer ring constantly wedged tightly against the valve seat, thereby assuring that the seat is retained securely in the valve body and is continually forced against the valve's flow control element throughout the entire range of operating temperatures and pressures. The rotational axis of the flow control element is offset from the valve's flow passage axis, and the valve's shaft is displaced from the valve seat along that same axis, thereby reducing thrust load on the flow control element, scuffing of the valve seat, and torque required to open and close the valve.
REFERENCES:
patent: 3127182 (1964-03-01), Wardleigh
patent: 3726504 (1973-04-01), Kormos
patent: 3726505 (1973-04-01), Williams
patent: 3801066 (1974-04-01), Miles
FMC Corporation
Ritt, Jr. W. W.
Tripp C. E.
Weakley Harold W.
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