A valve actuator apparatus and method comprises an operator housing secured to a bonnet assembly. The bonnet assembly is secured to the valve body, and includes a bonnet stem movably within a bonnet housing for moving a gate within the valve body to open and close the valve. A downstop member is fix
A valve actuator apparatus and method comprises an operator housing secured to a bonnet assembly. The bonnet assembly is secured to the valve body, and includes a bonnet stem movably within a bonnet housing for moving a gate within the valve body to open and close the valve. A downstop member is fixably secured to the bonnet stem and engages removable stem spacers which are added or removed to obtain a selected bonnet stem drift setting. The operator housing connects to a base ring that surrounds the bonnet housing and rotates to allow positioning of a fluid port in the operator housing. The operator housing may removed and replaced without altering the bonnet stem drift adjustment. A top shaft extends from the operator housing and rotates with respect to the bonnet stem to prevent torque transmission from the top shaft to the bonnet stem. A replaceable sealing cartridge sealingly supports the top shaft for axial movement within the operator housing.
대표청구항▼
What is claimed is: 1. A valve actuator for moving a valve gate between open and closed valve positions within a valve body, the valve actuator comprising: an operator assembly comprising: an operator housing defining a pressure chamber therein and having a fluid entry port; and an operator member
What is claimed is: 1. A valve actuator for moving a valve gate between open and closed valve positions within a valve body, the valve actuator comprising: an operator assembly comprising: an operator housing defining a pressure chamber therein and having a fluid entry port; and an operator member within the operator housing movable toward the valve body in response to pressurized fluid introduced into the operator housing pressure chamber through the fluid entry port; and a bonnet assembly comprising: a bonnet housing securable to the valve body, the bonnet housing having a bonnet housing bore therethrough; an elongated bonnet stem having first and second ends, the stem axially movable in the bonnet housing bore, unconnected at the first end to the operator member, and securable at the second end to the valve gate for moving the valve gate to the open and closed valve positions; a spring for producing a biasing force opposing axial movement of the operator member toward the valve body; a contact member, separate from the operator member, having an outer flange, and rotatably and axially affixed to the first end of the bonnet stem, and having a surface facing the operator member for drive contact with the operator member; an upper spring retainer having an inner flange for engagement with the outer flange to transmit the biasing force to the bonnet stem and to receive the movement of the operator member toward the valve body; and a base ring coaxially surrounding the bonnet housing, the base ring securing the operator housing to the bonnet housing by bolts disposed in apertures in the base ring and threaded into longitudinal openings in a base of the operator housing, wherein the bolts provide substantially the only securement between the operator assembly and the bonnet assembly. 2. The actuator of claim 1, wherein the operator assembly further comprises a shaft extending from a shaft aperture in the operator housing, the shaft axially movable through the shaft aperture and unconnected to the bonnet stem. 3. The actuator of claim 2, wherein the shaft is rotatable with respect to the bonnet stem. 4. The actuator of claim 1, further comprising: a seal cartridge disposed within a shaft aperture of the operator housing, the seal cartridge having a shaft bore therethrough with a seal therein for sealingly engaging a shaft and an outer surface with a seal thereon for sealingly engaging the shaft aperture; and a retainer ring disposed within the shaft aperture above the seal cartridge for retaining the seal cartridge within the shaft aperture, the retainer ring accessible from the exterior of the actuator to permit removal of the retainer ring and seal cartridge without removing the operator housing from the bonnet housing. 5. The actuator of claim 1, further comprising: a flexible diaphragm that applies pressure against the operator member, the flexible diaphragm having an engagement side that engages the operator member and a face side opposite the engagement side; a metallic insert disposed on the face side of the flexible diaphragm; and a diaphragm retainer nut threaded to the operator member, wherein the diaphragm retainer nut retains the flexible diaphragm in a fixed position with respect to the operator member and provides a circular groove disposed therein for receiving an elastomeric face seal. 6. The actuator of claim 1, wherein the base ring is configured for rotation with respect to the bonnet housing, thereby permitting the fluid port to be selectively rotated with respect to the bonnet housing. 7. The actuator of claim 1, wherein the bonnet assembly further comprises one or more bonnet stem spacers disposed on a stop surface fixably positioned with respect to the bonnet housing, the spacers engageable by the contact member to stop axial movement of the bonnet stem with respect to the valve body for a selected bonnet stem drift. 8. The actuator of claim 1, wherein the bolts provide the only securement between the operator assembly and the bonnet assembly. 9. A valve actuator for moving a valve gate between open and closed valve positions within a valve body, the valve actuator comprising: an operator assembly comprising: an operator housing defining a pressure chamber therein and having a fluid entry port; and an operator member within the operator housing movable toward the valve body in response to pressurized fluid introduced into the operator housing pressure chamber through the fluid entry port; and a bonnet assembly comprising: a bonnet housing securable to the valve body, the bonnet housing having a bonnet housing bore therethrough: an elongated bonnet stem having first and second ends, the stem axially movable in the bonnet housing bore, unconnected at the first end to the operator member, and securable at the second end to the valve gate for moving the valve gate to the open and closed valve positions: a spring for producing a biasing force opposing axial movement of the operator member toward the valve body; a contact member, separate from the operator member, having an outer flange, and rotatably and axially affixed to the first end of the bonnet stem, and having a surface facing the operator member for drive contact with the operator member; an upper spring retainer having an inner flange for engagement with the outer flange to transmit the biasing force to the bonnet stem and to receive the movement of the operator member toward the valve body; and a base ring coaxially surrounding the bonnet housing, the base ring securing the operator housing to the bonnet housing by bolts disposed in apertures in the base ring and threaded into longitudinal openings in a base of the operator housing, wherein the operator assembly is removable intact from the intact bonnet assembly by removal of the bolts; a top plug secured to the operator housing and having a bore therethrough; a shaft extendible through the top plug and into the pressure chamber, wherein the shaft is unconnected and rotatable with respect to the bonnet stem and movable axially to apply force to the bonnet stem; and a mechanical override secured to the top plug, wherein the shaft prevents transference of rotation from the mechanical override to the bonnet stem. 10. A valve actuator for moving a valve gate between open and closed valve positions within a valve body, the valve actuator comprising: an operator assembly comprising: an operator housing defining a pressure chamber therein and having a fluid entry port; and an operator member within the operator housing movable toward the valve body in response to pressurized fluid introduced into the operator housing pressure chamber through the fluid entry port; and a bonnet assembly comprising: a bonnet housing securable to the valve body, the bonnet housing having a bonnet housing bore therethrough; an elongated bonnet stem having first and second ends, the stem axially movable in the bonnet housing bore, unconnected at the first end to the operator member, and securable at the second end to the valve gate for moving the valve gate to the open and closed valve positions; a spring for producing a biasing force opposing axial movement of the operator member toward the valve body; a contact member, separate from the operator member, having an outer flange, and rotatably and axially affixed to the first end of the bonnet stem, and having a surface facing the operator member for drive contact with the operator member; an upper spring retainer having an inner flange for engagement with the outer flange to transmit the biasing force to the bonnet stem and to receive the movement of the operator member toward the valve body; and a base ring coupled to and coaxially surrounding the bonnet housing, wherein at least one fastener secures the operator housing to the base ring to provide substantially the only securement between the operator assembly and the bonnet assembly. 11. The actuator of claim 10, wherein the at least one fastener comprises a plurality of fasteners spaced around the base ring. 12. The actuator of claim 10, wherein the at least one fastener comprises bolts disposable in apertures in the base ring and corresponding apertures in the operator housing. 13. The actuator of claim 12, wherein at least one of the apertures is threaded. 14. The actuator of claim 12, wherein each aperture has an axis substantially parallel to an axis of the elongated bonnet stem. 15. The actuator of claim 12, wherein the at least one fastener provides the only securement between the operator assembly and the bonnet assembly. 16. The actuator of claim 12, wherein the base ring has a threaded inner diameter. 17. The actuator of claim 10, wherein the at least one fastener provides the only securement between the operator assembly and the bonnet assembly. 18. The actuator of claim 10, wherein the base ring has a threaded inner diameter. 19. The actuator of claim 10, further comprising a flexible diaphragm for applying pressure against the operator member. 20. The actuator of claim 19, further comprising a diaphragm retainer nut threaded into a center aperture in the operator member, wherein the diaphragm retainer nut retains the flexible diaphragm in a fixed position with respect to the operator member.
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