Patent ID: 11927274
Assignee: M-SYSTEM CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  G | IPC F  G

Claim 7:
8. A method of operating an actuator including a control unit configured to allow a first control capable of driving a drive part with a first driving force and a second control capable of driving the drive part with a second driving force which is stronger than the first driving force, a moving part configured to move in a predetermined direction, a spring member configured to receive at least one of the first driving force and the second driving force from the drive part and to supply a force for the moving part to move to the moving part, and a storage unit configured to store an amount of movement by which the drive part is caused to move by the second control in order to realize retightening a valve device, the method comprising:
a first step of starting a driving of the drive part by the control unit according to the first control,
a second step of ending the first control by the control unit when the driving of the drive part under the first control has stopped,
a third step of causing the storage unit to store a predetermined position which is apart from a position, at which the drive part stops under the first control, by the amount of movement of the drive part along a direction in which the drive part is driven by the first control, and
a fourth step of retightening the valve device by driving the drive part under the second control to the predetermined position stored in the storage unit.