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2018-08

Analysis of the Six Common Causes of Valve Positioner Problems

2018-08-16

Among the auxiliary devices for control valves, the most important and practical is the valve positioner. The valve positioner is one of the key accessories for control valves. It provides precise valve positioning by overcoming both stem friction and the unbalanced forces caused by fluctuations in process fluid pressure, thereby enabling the valve to respond rapidly and accurately to the control signal from the controller. This ensures fast valve positioning and enhances the overall control performance. With the advancement of smart instrumentation technology and the widespread adoption of intelligent and electronic technologies in conventional instruments, the functionality and performance of these devices have been significantly improved.

2018-11

Valve Positioner No Output Pressure Fault

2018-11-07

As many people know, a valve positioner can significantly enhance the accuracy and reliability of control valve positioning. However, if the valve positioner malfunctions—such as failing to produce output pressure—the impact on the valve’s normal operation can be very serious. Next, the valve positioner manufacturer will explain the common causes of no output pressure, so that when this issue arises in the future, you can promptly identify the root cause and take appropriate corrective measures. 1. The valve positioner itself may be defective, or there may be extensive air leaks in the signal piping, resulting in a lack of signal pressure and, consequently, no output pressure from the positioner. 2. There is no supply…

2019-05

Do you know how to select a valve positioner?

2019-05-22

Among the many control applications, valve positioners are one of the most important accessories for control valves. Particularly in a specific application, what factors should be considered when selecting the most suitable—or, in other words, the optimal—valve positioner? Let’s find out together! 1. Can the valve positioner implement “split-range” operation? And is it easy and convenient to do so? The “split-range” function means that the valve positioner responds only to a specific range of the input signal (e.g., 4–12 mA or 0.02–0.06 MPaG). Therefore, if it can “split”

2019-05

What are the functions and features of an intelligent valve positioner?

2019-05-25

The smart valve positioner is an intelligent field instrument. Thanks to the use of microprocessors and new control components, calibration of the valve positioner is more convenient and its application range has been significantly expanded. Its main features are: 1) Simple installation and flexible configuration; configuration can be performed via software to implement various functions, such as automatic zero-point adjustment, automatic modification of control parameters for indication and alarm, stroke limitation, and split-range control. It also allows for highly convenient setting of the direct/reverse action of the control valve, flow characteristics, and other parameters. 2) Low air consumption: Traditional electric valve positioners use nozzles and shutters that continuously consume air, whereas smart valve positioners employ pulse piezoelectric

2019-06

What are the characteristics of intelligent valve positioners?

2019-06-06

When it comes to smart valve positioners, some may be unfamiliar with the term; in fact, this type of product is now frequently encountered in our daily lives—people just don’t know what it’s called. A smart valve positioner is an intelligent field instrument. Thanks to the use of new components and microprocessor-based control, these positioners offer more convenient adjustment and a significantly expanded range of applications. Key features include: 1. Easy installation and flexible configuration; the software can be programmed to perform various functions, such as automatic zeroing, automatic adjustment of control parameters to implement alarm indications, stroke limits, and control segmentation, which makes it extremely convenient to establish precise throttle response and flow characteristics.

2019-06

A Brief Discussion on the Structure and Classification of Valve Positioners

2019-06-18

Valve positioners can be classified according to their structure into pneumatic valve positioners, electro-pneumatic valve positioners, and intelligent system valve positioners. They are essential accessories for control valves and are typically used in conjunction with pneumatic control valves. The positioner receives the output signal from the control panel and then uses its own output signal to regulate the pneumatic control valve. Once the control valve has reached the desired position, any deviation of the valve stem is fed back to the valve positioner via the process instrumentation, and the valve position information is transmitted as an electrical signal to the higher-level supervisory control system. (1) Structure Based on their structural design and operating principles, valve positioners can be divided into pneumatic valve positioners and electro-pneumatic valve positioners.

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