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(1) Intelligent functions such as self-diagnosis of control valves and remote communication in operation status make it easy to manage control valves, facilitate fault diagnosis, and reduce the skill requirements for maintenance personnel.
(2) Reduce product types and simplify production processes. Using a smart valve positioner can not only easily change the flow characteristics of the control valve but also improve the control quality of the control system. Therefore, the requirements on the flow characteristics of the control valve can be simplified and standardized (for example, only the line characteristic control valve). The intelligent function module is used to match the characteristics of the controlled object, so that the type and variety of the control valve product are greatly reduced, and the manufacturing process of the control valve is simplified. In order to reduce the variety of control valves, domestic manufacturers also produce full-function control valves. These intelligent methods will continue to increase, and will be tested and approved in the production and market.
(3) Digital communications. Digital communication will be widely used in control valves. Based on HART communication protocol, valve positioners of some control valves will implement input signals and valve position signals on the same transmission line; based on fieldbus technology, control valves and valve positioners The combination of PID control function modules enables the control functions to be implemented at the field level, which spreads the dangers and makes the control more timely and more rapid.
(4) Smart valve controller. The intelligent valve positioner has all the functions of the valve positioner. At the same time, it can improve the dynamic and static characteristics of the control valve and improve the control accuracy of the control valve. Therefore, the intelligent valve positioner will become an important control valve auxiliary equipment in the next period of time. widely used
The intelligentization and standardization of control valves have been mentioned on the agenda, and intelligent intelligent valve positioners are mainly used. The intelligent performance is shown in the following aspects.