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01

2018-01

Guide to Selecting Valve Positioners

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2018-01-24

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 explore this together with our editor. 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 “split-range” capability is available,

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02

2018-02

Introduction to the Adjustment Method for Valve Positioners

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2018-02-08

As an auxiliary device for pneumatic diaphragm control valves, the valve positioner plays a decisive role in the operation of these valves. The quality of positioner calibration directly affects valve performance and, consequently, process production operations. Since positioner calibration is a critical skill that instrumentation technicians must master, proficiency in proper calibration methods not only ensures high-quality adjustments but also significantly reduces workload. However, the commonly used calibration techniques sometimes prove ineffective, making it difficult to achieve accurate valve adjustment. Therefore, it is essential to analyze and refine conventional calibration methods to develop a more efficient approach.

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03

2018-03

Commissioning of Traditional and Smart Valve Positioners

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2018-03-17

I. Adjustment of Traditional Valve Positioners 1) Zero-Position Adjustment When the signal source is set to 4 mA, if the valve position indicator is not at the zero position, open the valve positioner and slowly adjust the zero-adjustment knob until the indicator reads zero. 2) Span Adjustment When the signal source is set to 20 mA, if the valve position indicator is not at the maximum position marked on the nameplate, adjust the span knob on the positioner until the indicator points to the maximum position. 3) After the span and zero have been properly adjusted, apply the following signals to the signal source—8 mA, 12 mA, 16 mA, and 20 mA—and verify that the valve position indicator respectively indicates 25%, 50%, 75%, and 100%. For example,

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04

2018-04

Differences Between Intelligent Valve Positioners and Conventional Valve Positioners

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2018-04-25

The differences between intelligent valve positioners and conventional valve positioners can be summarized as follows: 1. The methods for achieving the control valve’s flow characteristics differ. In intelligent positioners, the feedback mechanism employs linear feedback, and the desired control valve flow characteristic is realized within the setpoint loop. In contrast, conventional positioners use cams of various profiles in their feedback mechanisms; by altering the cam profile, the desired control valve flow characteristic is achieved. 2. The input–output interfaces differ. Typically, intelligent valve positioners are smart electro-pneumatic valve positioners. Compared with conventional electro-pneumatic valve positioners, the input signal for smart electro-pneumatic valve positioners is the standard 4–20 mA or 1–5

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05

2018-05

What are the functions of a valve positioner?

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2018-05-23

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 actuate the control valve. The primary function of the valve positioner is to increase the output power of the control valve and accelerate the response speed of the control signal. With a valve positioner, the stem movement is sped up, thereby enhancing the accuracy of valve positioning. Specifically, the functions of the valve positioner include the following: ① Valve positioners are typically used in control systems with stringent performance requirements, primarily to improve 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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06

2018-06

The Difference Between Electrical Converters and Electrical Valve Positioners

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2018-06-07

When manual operators, PID controllers, DCS systems, or PLCs use pneumatic control valves to perform process control, it is necessary to convert electrical signals into pneumatic signals in order to operate the pneumatic actuators. Electrical transducers and electric valve positioners both serve this function; however, because these two types of instruments differ in structure and function, their applications also vary.

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