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原文
Positioner Valve positioner is a pneumatic actuator of the main accessories, complete with pneumatic actuators used to improve the accuracy of the location of the valve, the valve stem friction and the media to overcome the impact of unbalanced force, in order to ensure the regulator valve according to signals to achieve correct positioning. The following cases, be equipped with locator: 1, medium pressure high pressure big time; 2, the control valve of large diameter (DN> 100); 3, high or low temperature control valve; 4, the need to improve movement speed control valve; 5, with the standard signal, the operation of the actuator spring when non-standard (20 ~ 100KPa spring outside the range); 6, for sub-process control; 7, the valve to achieve the reverse action (air to close each open-type gas conversion); 8, need to change the valve flow characteristics (the device can change the positioning cam); 9, no spring actuator or piston actuators, to achieve the ratio of action; 10, electrical signals to operate the pneumatic actuator must Distribution - gas valve positioner.
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译文:
  阀门定位器是气动执行器的主要附件,它与气动执行器配套使用,用来提高阀门的位置精度,克服阀杆摩擦力和介质不平衡力的影响,从而保证阀门按照调节器来的信号实现正确定位。 下列情况下,要配定位器: 1、介质压力高、压差大的时候; 2、调节阀的口径大时(DN>100); 3、高温或低温调节阀; 4、需要提高调节阀的动作速度时; 5、用标准信号、操作非标准弹簧的执行机构时(20~100KPa以外的弹簧范围); 6、用于分程控制时; 7、使阀门实现反向动作时(气关式和气开式互相转换); 8、需要改变阀的流量特性时(可以改变定位器凸轮); 9、无弹簧执行机构或活塞执行机构,要实现比例动作时; 10、用电信号去操作气动执行机构时,必须配电-气阀门定位器。


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