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(1) Intelligentization and standardization. The intelligentization and standardization of regulating valves have been mentioned on the agenda. Intelligent use mainly uses intelligent valve positioners. Intelligentization is reflected in the following aspects.
1 The self-diagnosis of the regulating valve and the intelligent function such as remote communication in the operating state make the management of the regulating valve convenient, the fault diagnosis becomes easy, and the skill requirements for the maintenance personnel are also reduced.
2 Reduce product types and simplify the production process. The intelligent valve positioner not only can easily change the flow characteristics of the regulating valve, but also improve the control quality of the control system. Therefore, the requirements for the flow characteristics of the regulating valve can be simplified and standardized (for example, only the linear characteristic regulating valve is produced). The intelligent function module is used to match the characteristics of the controlled object, so that the type and variety of the regulating valve product are greatly reduced. The manufacturing process of the regulating valve is simplified and tested and approved in production and in the market.
3 digital communication. Digital communication will be widely used in regulating valves. Based on the HART communication protocol, the valve positioners of some regulating valves realize the input signal and the valve position signal on the same transmission line; based on the field bus technology, the regulating valve and the valve positioner The combination of the PID control function modules enables the control functions to be implemented at the field level, so that the dangers are dispersed and the control is more timely and faster.
4 intelligent valve positioner. 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 precision of the control valve. Therefore, the intelligent valve positioner will become an important control valve auxiliary device in the future. widely used. The standardization of the regulating valve is as follows.
1 In order to achieve interchangeability, the regulating valves produced by different manufacturers of the same size and specifications can be interchanged, so that the user does not have to spend a lot of time to select the manufacturer.
2 In order to achieve interoperability, regulators manufactured by different manufacturers should be able to work with products from other manufacturers without signal mismatch or impedance mismatch.
3 Standardized diagnostic software and other ancillary software enable the calibration valves of different manufacturers to perform operational status diagnosis, analysis of operational data, etc.
4 standardized selection procedures. The selection of the regulating valve is still a matter of great concern to the self-control designer. Using the standardized calculation program, according to the data provided by the process, the flow coefficient of the required regulating valve can be correctly calculated, and the piping and the appropriate valve body, valve core and valve can be selected. Internal materials, etc., standardize the design process and improve design quality.
(2) Refinement. In order to reduce the weight of the regulating valve, it is convenient to transport, install and maintain, and the following measures are adopted for the miniaturization of the regulating valve.
1 Using a small and compact actuator. Using lightweight materials, multiple sets of springs are used instead of a set of springs to reduce the height of the actuator. Usually, the regulating valve composed of a small and compact pneumatic diaphragm actuator is reduced by about 30% compared to the height of the regulating valve composed of the same type of pneumatic diaphragm actuator. It is reduced by about 30%, and the circulation capacity can be increased by about 30%.
2 Change the flow path structure. For example, changing the movement of the spool to the movement of the valve seat, changing the linear displacement to an angular displacement, etc., reduces the volume of the regulating valve and reduces the weight.
3 using electric actuators. It not only reduces the air supply and auxiliary equipment required for pneumatic actuators, but also reduces the weight of the actuator. For example, Fisher's 9000 Series electric actuators, with a Model 20 height of less than 330 mm, reduce the overall control valve (with digital controller and actuator) to 20 to 32 kg.
(3) Rotating due to the rotary type regulating valve, such as a ball valve, etc., it has the advantages of relatively small volume, small flow path resistance, large adjustable, good sealing performance, good anti-blocking performance, and large circulation capacity. Therefore, in the new type of regulating valve, the specific gravity of the rotary valve is increased. Especially in large-diameter pipelines, ball valve, butterfly valve and other types of regulating valves are widely used. From the products of foreign countries in recent years, the proportion of rotary valve applications is increasing year by year.