| 摘要 |
Provided is a double nozzle type positioner, which includes a flapper (1), a first nozzle (2) and a second nozzle (3) disposed at both sides based on the flapper (1), a first orifice (4) configured to maintain a constant pressure of the first nozzle (2), a second orifice (5) configured to maintain a constant pressure of the second nozzle (3), a first pilot valve (6) having an input portion connected to a feed pressure, a second pilot valve (7) having an input portion connected to an output portion of the first pilot valve (6), a discharge hole (8) connected to an output portion of the second pilot valve (7), and an actuator (9) connected to the output portion of the first pilot valve (6) and the input portion of the second pilot valve (7). If the first nozzle (2) is opened due to the movement of the flapper (1), the second nozzle (3) is closed, and if the first nozzle (2) is closed, the second nozzle (3) is opened. |
| 主权项 |
1. A double nozzle type positioner, comprising:
a flapper (1); a first nozzle (2) and a second nozzle (3) disposed at both sides based on the flapper (1); a first pilot valve (6) connected to the first nozzle (2); a second pilot valve (7) connected to the second nozzle (3); a constant pressure source configured to supply a constant pressure to the first nozzle (2), the first pilot valve (6), the second nozzle (3) and the second pilot valve (7); a first orifice (4) configured to maintain a pressure provided from the constant pressure source to the first nozzle (2) and the first pilot valve (6) as a constant pressure; and a second orifice (5) configured to maintain a pressure provided from the constant pressure source to the second nozzle (3) and the second pilot valve (7) as a constant pressure, wherein an input portion of the first pilot valve (6) is connected to a feed pressure, and the first pilot valve (6) is configured to transfer the pressure supplied from the input portion of the first pilot valve (6) to an output portion of the first pilot valve (6), according to a pneumatic pressure supplied from the constant pressure source, wherein the output portion of the first pilot valve (6) is connected to an input portion of the second pilot valve (7), wherein the second pilot valve (7) is configured to transfer the pressure supplied to the input portion of the second pilot valve (7) to an output portion of the second pilot valve (7), according to a pneumatic pressure supplied from the constant pressure source, and the output portion of the second pilot valve (7) is connected to a discharge hole (8), wherein a contact point between the output portion of the first pilot valve (6) and the input portion of the second pilot valve (7) is connected to an actuator (9), wherein when the first nozzle (2) is opened due to the movement of the flapper (1), the second nozzle (3) is closed, and when the first nozzle (2) is closed, the second nozzle (3) is opened. |
