| 发明名称 |
VALVE POSITIONER WITH OVERPRESSURE PROTECTION CAPABILITIES |
| 摘要 |
A method of limiting control pressure provided to an actuator of a valve coupled to a valve positioner, a drive signal is provided to a pneumatic stage of the valve positioner. The pneumatic stage is arranged to control output pressure of the valve positioner in accordance with the drive signal. A pressure measurement from a pressure sensor communicatively coupled to the valve positioner is obtained, and an abnormal pressure is detected based on the pressure measurement. In response to detecting the abnormal pressure, the drive signal is controlled so as to limit the output pressure of the valve positioner, wherein the output pressure provides control pressure to the actuator. |
| 申请公布号 |
US2017023954(A1) |
申请公布日期 |
2017.01.26 |
| 申请号 |
US201615289723 |
申请日期 |
2016.10.10 |
| 申请人 |
FISHER CONTROLS INTERNATIONAL LLC |
发明人 |
Grumstrup Bruce Frederick;Miller Lorin Dion;Snowbarger Jimmie Lee;Wittkop Adam Joseph |
| 分类号 |
G05D16/20;F16K31/42 |
主分类号 |
G05D16/20 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A method of limiting control pressure provided to an actuator of a valve coupled to a valve positioner, the method comprising:
providing a drive signal to a pneumatic stage of the valve positioner, wherein the pneumatic stage is arranged to control output pressure of the valve positioner in accordance with the drive signal; obtaining a pressure measurement from a pressure sensor communicatively coupled to the valve positioner; detecting an abnormal pressure based on the pressure measurement; and in response to detecting the abnormal pressure, controlling the drive signal so as to limit the output pressure of the valve positioner, wherein the output pressure provides control pressure to the actuator. |
| 地址 |
Marshalltown IA US |
