| 摘要 |
PROBLEM TO BE SOLVED: To provide a double-nozzle type positioner according to one preferred embodiment of this invention.SOLUTION: This positioner comprises a flapper 1; a first nozzle 2 and a second nozzle 3 arranged at both sides of a center of the flapper 1; a first orifice 4 kept at a specified pressure of the first nozzle 2; a second orifice 5 kept at a specified pressure of the second nozzle 3; a first pilot valve 6 having an input part connected to supplied pressure; a second pilot valve 7 having an input part connected to an output part of the first pilot valve 6; a discharging port 8 connected to an output part of the second pilot valve 7; and an actuator 9 connected to the output part of the first pilot valve 6 and the input part of the second pilot valve 7. When the first nozzle 2 is released through motion of the flapper 1, the second nozzle 3 is closed and when the first nozzle 2 is closed, the second nozzle 3 is released.SELECTED DRAWING: Figure 3 |
