| 摘要 |
PROBLEM TO BE SOLVED: To provide an actuator device which causes a flow control member to move to a predetermined position (e.g., a fully closed position, a fully open position) when a valve is in a failed position even in high pressure applications.SOLUTION: A fluid control system 300 includes a first fluid control apparatus 318 to fluidly couple a control fluid supply source to a control actuator 202 via a first passageway. The control fluid supply source provides a control fluid to move a control actuator member 204 of the control actuator in a first direction or a second direction opposite to the first direction when the control actuator is in an operational state. A second fluid control apparatus 354 is in fluid communication with the first fluid control apparatus and is configured to fluidly couple an override actuator 226 to the control actuator via a second passageway when the control actuator is in a non-operational state. The override actuator is operatively coupled to the control actuator.SELECTED DRAWING: Figure 3 |
