Control valve function introduction

early in 1990, the structure and function of the control Industrial Valves is still relatively stable, but some new control valve structure, such as eccentric cock yan and spring actuator, is considered to be advanced. Control valve as the main role of terminal control element has more than 30 years did not change, it has been widely accepted.

integral concept and control valve of the digital times intelligence in early 1990 for process control by industry experts announced early prototype of the future and is known for the first time, but these early prototype design basically be self-contained facilities, for process industry is not yet can use unified field information transfer pathways connected to DCS standard to apply these values.

but in the next ten years, Because of the field bus communication, wireless network technology, condition monitoring, the rapid development of Ethernet technology and facilities) , the valve industry has been again by the sudden appearance of digital product development incentives. In 2004, the overall control of Lv digital products and software secondary industry has been realized and promote the growth of the overall control valves industry.

control valve has been applied to the pipeline, it USES the dashboard micro processor or digital locator and die quote or digital communication. For end control components, the control valve have to be with the controller or DCS counting method is used to the ability of communication, mutual induction, and other digital field instrument and the advantages of digital dun - positive aspects. At least these need digital locator.

the development of flexible products initially because of a lack of standardized site information transfer pathways and slow, but today many flexible valves and locators have been developed, so they can deal with many Suggestions of information transfer pathways version ( Each Lan to their respective software and hardware versions) 。 Today can flexible valve based on micro processor and design change is very big, such as on the valve of the flexible system can provide a single loop control - It requires that the sensor, controller and digital locator with process.

these require a wide range of functions, from process control to obtain data, diagnosis to itself. In addition, for some flexible valve, PD control to add people to the automatic loop tuning process, so it is more efficient. In addition, digital locator contains micro processor, it is only used to help the valve to use its ability, have terminal control element - - The role of the sample. In a word, his live valves and positioner can provide various grades of both the valve itself diagnosis and security system management. For example, under the control of parking.

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