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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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07

2018-07

Fault Analysis Method for Valve Positioners

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2018-07-05

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 pressure, 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 traditional instruments, the functionality and performance of these devices have been significantly improved.

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08

2018-08

Valve Positioner Commissioning Steps

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2018-08-13

Valve positioner commissioning steps: 1. Positioner panel settings: 2. Internal wiring (four wires): feedback and command lines. 3. Important parameter-switching methods before commissioning: (1) Switch between local and remote operation. Press and hold the MODE key without releasing, then press the ↑ or ↓ keys to toggle between the two modes. (2) Use the method in (1) to enter 1.1 (Remote Control) and 1.2 (Local Control). (3) To achieve quick opening, first press and hold the ↑ key, then press the ↓ key; to achieve quick closing, first press and hold the ↓ key, then press the ↑ key—only in this sequence can the operation be completed. (4) Use the method in (1) to enter 1.3, where the word SE will appear.

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