GB/T 22137.1-2008 工业过程控制系统用阀门定位器 第1部分:气动输出阀门定位器性能评定方法 Valve positiongers for use in industrial-process control system - Part 1: Methods of evaluating the performance of valve positiongers with pneumatic outputs
Valve positiongers for use in industrial-process control system - Part 1: Methods of evaluating the performance of valve positiongers with pneumatic outputs