A control valve having a shiftable valve plug includes a valve body having an inlet, an outlet, a flow passage extending between the inlet and the outlet, and defining a longitudinal axis, a generally cylindrical valve cage disposed within the valve body and sized to receive the valve plug, with the
A control valve having a shiftable valve plug includes a valve body having an inlet, an outlet, a flow passage extending between the inlet and the outlet, and defining a longitudinal axis, a generally cylindrical valve cage disposed within the valve body and sized to receive the valve plug, with the valve cage including at least one aperture comprising at least a portion of the flow passage, a portion of the valve cage disposed adjacent a portion of the valve body at an interface. A seal having a C-shaped cross section is provided and is disposed at the interface between the valve cage and the valve body, and a retainer is disposed adjacent the interface and positioned to secure the seal against movement along the longitudinal axis.
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What is claimed: 1. A control valve comprising: a valve body having an inlet, an outlet, a flow passage extending between the inlet and the outlet, and defining a longitudinal axis, the valve body having a first thermal expansion coefficient; an internal valve component, at least a portion of which
What is claimed: 1. A control valve comprising: a valve body having an inlet, an outlet, a flow passage extending between the inlet and the outlet, and defining a longitudinal axis, the valve body having a first thermal expansion coefficient; an internal valve component, at least a portion of which is fixed against displacement relative to the valve body, the valve component having a second thermal expansion coefficient different than the first thermal expansion coefficient; a seal having a C-shaped cross section and the seal contacting an outer surface of the valve component and an inner surface of the valve body, the C-shaped cross section of the seal includes an open part positioned to permit thermal expansion of the internal valve component relative to the valve body in a direction transverse to the longitudinal axis; and a retainer disposed immediately adjacent the seal and arranged to secure the seal against movement parallel to the longitudinal axis. 2. The control valve of claim 1, wherein the retainer includes an inwardly extending flange and an inwardly extending ring, the flange and the ring carried by the valve body and spaced apart to form a gap sized to receive the seal. 3. The control valve of claim 2, wherein the ring comprises a snap ring disposed in a recessed channel formed on an inner surface of the valve body. 4. The control valve of claim 1, wherein the retainer comprises a recessed formation formed in the inner surface of the valve body and sized to engage at least a portion of the seal. 5. The control valve of claim 4, wherein the retainer further includes an inwardly extending flange carried by the valve body, and wherein the recessed formation is disposed immediately adjacent the flange. 6. The control valve of claim 1, wherein the retainer includes a plurality of spaced apart indentations defined on an inner surface of the valve body, each of the indentations sized to receive a portion of the seal, a first one of the indentations defining a first seat location and a second one of the indentations defining a second seat location. 7. The control valve of claim 1, wherein at least one of the internal component and the seal includes a coating adjacent the interface. 8. The control valve of claim 7, wherein the coating on the seal comprises a soft metal coating. 9. The control valve of claim 7, wherein the coating on the seal comprises a hardened coating. 10. The control valve of claim 1, wherein a surface of the internal component includes a coating and the seal includes a coating contacting the coating of the internal component, the coating of the internal component compatible with the coating of the seal. 11. The control valve of claim 1, wherein the seal is in sealing engagement with the valve body and the internal valve component. 12. The control valve of claim 1, wherein the seal has a generally circular cross-section. 13. A control valve having a shiftable valve plug and comprising: a valve body having an inlet, an outlet, a flow passage extending between the inlet and the outlet, and defining a longitudinal axis; a generally cylindrical valve cage having at least a portion that is fixed within the valve body against displacement parallel to the longitudinal axis, the valve cage sized to receive the valve plug and including at least one aperture comprising at least a portion of the flow passage, a portion of the valve cage disposed adjacent a portion of the valve body at an interface; a seal having a C-shaped cross section, the seal disposed between and in contact with an outer surface of the valve cage and an inner surface of the valve body, the C-shaped cross section of the seal includes an open part oriented at the interface so as to accommodate temperature related expansion and retraction of the valve cage relative to the valve body; and a retainer disposed adjacent the interface and positioned to secure the seal against movement along the longitudinal axis. 14. The control valve of claim 13, wherein the retainer comprises at least one flange carried by the valve body. 15. The control valve of claim 13, wherein the retainer includes an inwardly extending flange carried by the valve body adjacent to the interface. 16. The control valve of claim 15, wherein the retainer includes a ring disposed on an inner surface of the valve body and spaced from the flange to form a gap, the seal disposed in the gap. 17. The control valve of claim 15, wherein an inner surface of the valve body includes an indentation sized to engage an outer portion of the seal. 18. The control valve of claim 13, wherein the retainer includes an indentation defined on an inner surface of the valve body and sized to engage an outer portion of the seal. 19. The control valve of claim 13, wherein the retainer includes a plurality of spaced apart indentations defined on an inner surface of the valve body, each of the indentations sized to receive an outer portion of the seal, a first one of the indentations defining a first seat location and a second one of the indentations defining a second seat location. 20. The control valve of claim 13, wherein the retainer includes a snap ring carried by an inner surface of the valve body. 21. The control valve of claim 20, wherein the snap ring is secured in a channel formed in the inner surface of the valve body. 22. The control valve of claim 13, wherein at least one of the valve cage and the seal includes a coating adjacent the interface. 23. The control valve of claim 22, wherein the coating on the seal comprises a soft metal coating. 24. The control valve of claim 22, wherein the coating on the seal comprises a hardened coating. 25. The control valve of claim 13, wherein an outer surface of the valve cage includes a coating and the seal includes a coating, the coating of the outer surface of the valve cage compatible with the coating of the seal. 26. The control valve of claim 13, wherein the seal is in sealing engagement with the valve body and the valve cage. 27. The control valve of claim 13, wherein the seal has a generally circular cross-section. 28. A control valve comprising: a valve body having an inlet, an outlet, a flow passage extending between the inlet and the outlet, and defining a longitudinal axis; a generally cylindrical valve cage fixed against movement within the valve body, except for movement due to thermal expansion and retraction of at least one of the valve body and the valve cage; a seal having a C-shaped cross section, the seal contacting an outer surface of the valve cage and an inner surface of the valve body, the C-shaped cross section of the seal including an open part oriented relative to the valve cage and valve body to accommodate the effects of the thermal expansion and retraction of the valve cage and the valve body; and a retainer positioned between the valve cage and the valve body to secure the seal against movement along the longitudinal axis.
Gossett, James Leroy; Fitzgerald, William V.; Micheel, Raymond W.; Sanders, Donald; Bush, Donald Ray; Helfer, Wade Jonathon, Control valve having “C” seal.
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