F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/33
F16K 5/00 (2006.01) F16K 1/226 (2006.01)
Patent
CA 1095487
Abstract of the Disclosure 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 flexible annular 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 through a wide range of ambient: and low temperatures. The valve seat includes an annular, radially outward extending support leg that is held in position against a radial surface of the valve's body by the energizer ring, at least one outer annular sealing lip that extends is a generally axial direction from the leg, and a central sealing lip that extends radially inwardly from the support leg toward the flow control element. At ambient temperatures a portion of the outer sealing lip presses against the flow control element when the valve is closed, and when the temperature is lowered toward the cryogenic range the central sealing lip moves into fluid-tight contact with the flow control element, thereby providing an additional seal at the lower temperatures. 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 the 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 con- tinually forced against the valve's flow control element throughout the entire range of operating temperatures and pressures. -1a-
303055
Fetherstonhaugh & Co.
Fmc Corporation
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