Abstract: Described is a fail-safe actuating system, comprising an actuator with an actuator housing and an output element. The output element is couplable to a controlled device. The fail-safe actuating system also comprises a biasing element, coupled to the actuator housing, which gets biased by a movement of the actuator housing in a first predefined direction; a locking device that locks the actuator housing for holding the biasing element in a biased state; and a controller configured to operate the actuator in a first operating mode, in which the actuator housing moves with respect to the output element for biasing the biasing element, and in the second operating mode, in which the output element moves with respect to the actuator housing for moving the controlled device.

Abstract: Described is a fail-safe actuating system, comprising an actuator with an actuator housing and an output element. The output element is couplable to a controlled device. The fail-safe actuating system also comprises a biasing element, coupled to the actuator housing, which gets biased by a movement of the actuator housing in a first predefined direction; a locking device that locks the actuator housing for holding the biasing element in a biased state; and a controller configured to operate the actuator in a first operating mode, in which the actuator housing moves with respect to the output element for biasing the biasing element, and in the second operating mode, in which the output element moves with respect to the actuator housing for moving the controlled device.

Abstract: The present subject matter relates to a fluid control system having a first orifice to provide a first pass-area to a fluid, a first closing element to vary the first pass-area, a second orifice, smaller than the first orifice and configured in the first closing element, to provide a second pass-area to the fluid, a second closing element to vary the second pass-area, a single actuating shaft and a balancing chamber. The first closing element includes a channel The fluid flows through the channel to and from the balancing chamber for equalizing of fluid pressure across the first closing element. The first and the second pass-areas are varied by the first and the second closing elements through movements of the actuating shaft. Further, the first and the second closing elements are contoured in the direction of movement of the shaft to vary the first and the second pass-areas.