智能电—气阀门定位器

气动调节阀是工业过程控制中一种重要的执行器。阀门定位器作为其主要附件，能够显著改善阀门的特性，提高控制的精度、速度和灵活性。本文论述了气动调节阀及定位器的作用和基本原理，并论述了智能电－气阀门定位器的控制电路结构及五接点开关控制策略。相对于传统定位器，具有控制精度高、适应性强、调校方便、控制灵活等特点。

Intelligent Electro-pneumatic Valve Positioner

The pneumatic valve is one of the most important actuator in the industrial process control. As the key attachment to the valve, the valve positioner improves significantly the performance of the valve in many aspects. This paper discusses the basic principle of the pneumatic valve, the valve positioner and the control circuit of the intelligent electro-pneumatic valve positioner. The five-point switch is exploited as the main control algorithm. The intelligent electro-pneumatic valve positioner is more accuracy, more adaptability and more flexibility than the traditional force-balancing system.