초록 ▼

A subsea actuator and method is disclosed that includes all moving components mounted in a compact, concentric configuration. The subsea actuator is highly reliable and will operate at depth even with zero valve body cavity pressure. A preferably cup-shaped spring pusher is provided in telescoping r

A subsea actuator and method is disclosed that includes all moving components mounted in a compact, concentric configuration. The subsea actuator is highly reliable and will operate at depth even with zero valve body cavity pressure. A preferably cup-shaped spring pusher is provided in telescoping relationship to the hydraulic chamber. A piston position indicator is provided which is connected externally to the hydraulic piston cylinder to avoid the possibility of hydraulic leaks due to the piston indicator. A manual override may be provided with a manual override indicator. The manual override indicator has a shorter travel length than the manual override operating stem to thereby reduce the overall length of the manual override assembly. The driving stem provides a removable connection to the hydraulic piston from the top of the actuator housing and a quick disconnect permits disconnection of the driving stem from the valve stem. In a preferred embodiment, upper and lower t-slot connections are utilized in the driving stem assembly. In a preferred embodiment, two back seat valves are removably secured to the driving stem to engage respective seats and provide additional sealing around the driving stem so as to prevent leakage between the valve chamber and actuator housing chamber. The high tension spring does not need to be removed to perform maintenance, and all wear items and seals are readily accessible. Change or replacement of the stem packing is made from the top of the bonnet to avoid dissasembling the bonnet to valve body connection. Pre-load bolts are used to adjustably preload the tension in the return spring. The height/weight of the actuator is significantly reduced as compared to prior art subsea valve actuators.

대표청구항 ▼

A subsea actuator and method is disclosed that includes all moving components mounted in a compact, concentric configuration. The subsea actuator is highly reliable and will operate at depth even with zero valve body cavity pressure. A preferably cup-shaped spring pusher is provided in telescoping r

A subsea actuator and method is disclosed that includes all moving components mounted in a compact, concentric configuration. The subsea actuator is highly reliable and will operate at depth even with zero valve body cavity pressure. A preferably cup-shaped spring pusher is provided in telescoping relationship to the hydraulic chamber. A piston position indicator is provided which is connected externally to the hydraulic piston cylinder to avoid the possibility of hydraulic leaks due to the piston indicator. A manual override may be provided with a manual override indicator. The manual override indicator has a shorter travel length than the manual override operating stem to thereby reduce the overall length of the manual override assembly. The driving stem provides a removable connection to the hydraulic piston from the top of the actuator housing and a quick disconnect permits disconnection of the driving stem from the valve stem. In a preferred embodiment, upper and lower t-slot connections are utilized in the driving stem assembly. In a preferred embodiment, two back seat valves are removably secured to the driving stem to engage respective seats and provide additional sealing around the driving stem so as to prevent leakage between the valve chamber and actuator housing chamber. The high tension spring does not need to be removed to perform maintenance, and all wear items and seals are readily accessible. Change or replacement of the stem packing is made from the top of the bonnet to avoid dissasembling the bonnet to valve body connection. Pre-load bolts are used to adjustably preload the tension in the return spring. The height/weight of the actuator is significantly reduced as compared to prior art subsea valve actuators. ely displaceable manner responsive to said control button within said hollow main body compartment for displacement between first and second positions relative to said hollow main body, said control loop member including a transversely protruding tongue portion for, in said first position, retentively engaging said lower portion of said runner when said runner is disposed in said one of said opened and closed positions; (f) a spring coupled to said control loop member and said hollow main body for resiliently biasing said control loop member to said first position; and, (g) a control bar member pivotally coupled to said control loop member for displacement between retracted and extended positions, said control bar member being resiliently biased to one of said retracted and extended positions, whereby said control bar member is selectively disposed to extend into said hollow main body compartment for directly engaging said bullet head member responsive to displacement of said control loop member. iarra et al., Eds., Harper & Row, New York, pp. 169-175. Quinones et al., "Hysteroscopic Sterilization," Int. J. Gynaecol. Obstet., (1976) 14:27-34. Reed, T.P. et al., "Tubal Occlusion with Silicone Rubber," The Journal of Reproductive Medicine, pp. 25-28, Jul., 1980. Richart et al., "Evaluation of Polymer Flock and Metal Alloy Intra-Tubal Device in Pigtail Monkeys," Contraception, (1978) 18(5):459-468. Ross, P.L. et al. "Transcatheter Tubal Sterilization in Rabbits," Investigative Radiology, vol. 29, No. 5, pp. 570-573, 1994. Sciarra, J.J., et al., eds., Advances in Female Sterilization Techniques, Harper & Row, Publishers, 1976, Title Page and Table of Contents are enclosed herewith, pp. 169-181, 186-189. Sciarra, "Heteroscopic Approaches for Tubal Closure," Research Frontiers in Fertility Regulation (1980) Zatucchni et al., Eds., Harper & Row, New York, pp. 270-286. Steptoe, Patrick C., "The Potential Use of Intratubal Stents for Reversible Sterilization," Laparoscopy, pp. 91-99, circa 1976.