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09

2017-09

Development Trends in Smart Valve Positioner Technology

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2017-09-21

The intelligent valve positioner was the first DVC series product launched by FISHER in the 1990s. It significantly enhanced the control performance of control valves and achieved immediate and widespread success upon its introduction. To this day, this product series continues to hold the largest market share—according to data from ARC Advisory Group in 2007, it accounted for approximately 34% of the global intelligent valve positioner market that year. Subsequently, several major international companies, including FLOWSERVE, Metso, Siemens, ABB, and Dresser-Masoneilan,

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09

2017-09

Precautions for Using Valve Positioners

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2017-09-23

When in use, valve positioners are typically paired with control valves and serve as one of the key components of the control valve system. They receive signal outputs from the controller, thereby controlling the operation of the control valve and ultimately transmitting electrical signals to the higher-level control system. The following outlines several important considerations for the proper use of valve positioners: 1. In critical control systems, pairing the system with high-quality control valves can significantly enhance the precision and reliability of valve positioning. 2. In some cases, when there is a large pressure differential across the valve, increasing the air supply pressure can help the valve plug overcome unbalanced forces, thus reducing malfunctions.

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09

2017-09

Analysis of Common Causes of Valve Positioner Problems

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2017-09-26

To troubleshoot a valve positioner, it is essential to accurately identify which stage or component of the device has failed. Typically, two fault-analysis approaches are used: first, based on the valve positioner’s transfer function, the system can be analyzed stage by stage and component by component; this method is less suitable for on-site maintenance but highly effective for diagnosing complex and difficult-to-resolve problems. Second, maintenance personnel can perform a comprehensive analysis and judgment based on the observed symptoms of the fault; this approach is most appropriate for field troubleshooting. The following section outlines the root causes of common faults that may occur in valve positioners: 1. The valve positioner receives a signal input but produces no output pressure.

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10

2017-10

Valve Positioner Selection Guide

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2017-10-27

Valve selection must comprehensively consider various factors, including process conditions and the operating environment. So how should a valve positioner be selected? The following is a guide for selecting valve positioners for your reference. 1. Can the valve positioner implement “split-ranging”? Is it easy and convenient to achieve split-ranging? Having the split-ranging 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 split-ranging is available, you can use a single input signal to sequentially control two or more actuators according to actual needs.

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10

2017-10

The function of a valve positioner

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2017-10-27

(1) Improving the steady-state characteristics of the valve: After the installation of a valve positioner, even a slight change in the controller output signal will, through the nozzle–flapper mechanism and the amplifier, result in a substantial variation in the air pressure supplied to the control valve diaphragm chamber. This adjustment overcomes stem friction and eliminates the effects of unbalanced forces acting on the control valve, thereby ensuring that the valve position is accurately set in accordance with the signal from the controller. With improved steady-state characteristics, the control valve becomes suitable for the following applications: ① situations requiring precise adjustment of the valve position; ② applications involving large-diameter valves and high pressure differentials, where unbalanced forces are significant; ③ applications in which the stuffing box must be tightly compressed to prevent leakage, such as those involving high pressure, high temperature, or low temperature; ④

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11

2017-11

What are the advantages of a valve positioner?

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2017-11-03

The valve positioner is a key component of the control valve; it receives the signal from the controller and, in turn, outputs a control signal to regulate the valve. Its primary function is to increase the output power of the control valve and enhance the speed of signal response. With a valve positioner, the stem movement is accelerated, thereby improving the accuracy of valve positioning. Specifically, the functions of a valve positioner include the following: ① Valve positioners are typically used in control systems with stringent performance requirements, primarily to enhance the positioning accuracy and reliability of the control valve. In other words, when a valve positioner is employed, the control valve

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