| 摘要 |
An oscillatory rotary actuator is provided for controlling an adjustable valve. The actuator comprises a freely rotating, cylindrical housing with concentric inner and outer walls about its center. The housing has at least one depending vane, which functions as a rotary piston, that is radially disposed between the inner and outer walls. The rotary actuator further comprises an annular chamber easing which has two concentric walls that are designed to mate between the inner and outer walls of the housing member to receive the depending vane(s) between the concentric walls of the chamber casing. At least one radially extending chamber wall is interposed and attached to the concentric walls of the chamber casing. When the housing member is fitted over or receives the annular chamber casing, the housing, chamber easing and chamber wall collectively form at least one rotary chamber for the arcuate movement of the depending vane, or rotary piston, therein. A valve control system is also provided for the operation of an adjustable valve for controlling the flow of fluid therethrough from a control module located at a distance from the valve, The valve can be operated as a function of a desired valve position utilizing actuator position feedback sensing; desired fluid pressure utilizing pressure feedback sensing; or desired fluid flow rate utilizing flow feedback sensing. 51 Docket No. NR-101 The adjustable valve is preferably one that has a quarter turn from the open to the close position, such as a ball valve or butterfly valve. 52 Docket No. NR-101
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