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valve positioner
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  valve positioner
Valve positioner a device that adjusts the instrument air pressure to a control valve to maintain a specified value for the stem position.
      
The As2 flux was adjusted with the aid of an automated valve positioner which allowed rapid flux change.
      


The know how of highly reliable control pystem,as is put forward here,consists in locating a breaker in the series control loop and blocking the hitch before it,for which the technical prerequisite is the preparation of motor driven valve positioner and independent manually oporated device,with the development of a new generation of control instruments to be entailed.

公开了笔者关于高可靠控制系统的技术诀窍。其思路是在串联的控制回路中找一个断点,使断点前的故障能被隔离,其技术核心是研制电动阀门定位器、独立的手操器,并由此带动新一代控制仪表的研制

The self- developed smart pneumatic valve positioner based on FF protocol is introduced. The de- signs of hardware and software as well as the implementation of FF communication are described concretely. The development procedures and kits of fieldbus devices based on FF protocol are also presented.

介绍了自主开发的基于 FF协议的智能气动阀门定位器 ,具体阐述了 FF智能气动阀门定位器的硬件设计、软件设计以及 FF通信的实现。文中对 FF现场设备开发的方法和工具也作了说明

Smart valve positioners have been applied successfully, but they are still in the developing stage. Because the meaning and manners of formulation for various performance datum are not vary clear, Different manufacturers and their different products are much different in function and price. It is one of the reasons why the application of smart valve positioner can not be as wide as smart transmitters. It is discussed that the new problems are appear in design and selection of smart valve positioner....

Smart valve positioners have been applied successfully, but they are still in the developing stage. Because the meaning and manners of formulation for various performance datum are not vary clear, Different manufacturers and their different products are much different in function and price. It is one of the reasons why the application of smart valve positioner can not be as wide as smart transmitters. It is discussed that the new problems are appear in design and selection of smart valve positioner.

智能阀门定位器目前已能成功应用,但仍处于一个发展阶段。由于其各种性能指标的意义及表述还不十分清楚,各公司、各产品的功能差别很大,价格差异也较大,使得设计选型产生较多困难。这也是目前智能阀门定位器的应用不像智能变送器那样广泛应用的原因之一,现探讨智能阀门定位器在设计选型过程中出现的一些新问题。

 
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