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08

2017-08

Principle of Pneumatic Valve Positioners

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2017-08-17

A pneumatic valve positioner is mounted on a pneumatic control valve to provide precise positioning. When used in conjunction with the control valve, the positioner incorporates a double-acting pneumatic actuator, ensuring reliable operation and maintaining high efficiency. Owing to its excellent performance and functionality, it has found extensive application in various automation fields.

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08

2017-08

Implementation Principle and User Guide for the Fault-Lock Function (Three-Condition Position-Holding) of the TORLEO Smart Valve Positioner

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2017-08-21

I. Introduction Fault-locking (three-failure position-holding) refers to the positioning device maintaining the valve in its position prior to the failure when power is lost, the signal is interrupted, or the air supply is cut off, thereby achieving position holding. For valves that have been properly adjusted, the most fundamental solution for ensuring position holding under any of these three failure conditions is to effectively shut off the air supply line to the valve whenever one of the three failures occurs—power loss, signal interruption, or air-supply failure—and to rely on the air-tightness of the valve’s pneumatic actuator to lock the valve in the position it was in at the moment the failure occurred. For conventional positioners that do not inherently possess three-failure position-holding functionality (such as those from leading imported brands like SIEMENS, Fisher, and Azbil),

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08

2017-08

Analysis of the Performance Characteristics of Valve Positioners

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2017-08-22

The introduction of valve positioners has provided advanced tools for digital communication among field actuators and for plant-wide integrated management. The TZID/TZID-C breaks with the traditional concept of positioners by adopting TEIP11 as its core component, integrating microprocessor technology and built-in communication functionality. Valve positioners have the following key features: 1. Standard configuration includes a specially designed enclosure that effectively shields against interference signals; 2. A unique patented technology—the “three-loss protection” function—ensures that the valve remains in its current position in the event of power failure, signal loss, or air supply loss, eliminating the need for external solenoid valves and power-failure comparators. This offers three significant advantages: A

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08

2017-08

What are the classifications of valve positioners?

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2017-08-25

Valve positioners are classified by structure into pneumatic valve positioners, electric valve positioners, and smart 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 controller and uses this signal to regulate the pneumatic control valve. Once the control valve actuates, the displacement of the valve stem is fed back to the positioner via a mechanical linkage, and the valve position is transmitted to the higher-level system as an electrical signal. Classification of Positioners 1. Valve positioners are categorized by input signal into pneumatic valve positioners, electric valve positioners, and smart valve positioners. (1) The input signal for a pneumatic valve positioner is a standard pneumatic…

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09

2017-09

Why does a valve positioner experience surge?

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2017-09-02

Why does a valve positioner experience surge? This was a technical consultation question I encountered a few days ago, and in response I have outlined several possible causes of surge in valve positioners along with corresponding solutions. The following information focuses on the potential causes of surge in mechanical valve positioners and the methods for troubleshooting them. As for smart valve positioners, one possible cause is improper initialization settings; this can be resolved by referring to the relevant manufacturer’s operating manual. Valve positioner surge can be caused by a variety of factors: The first possibility is that the actuator air chamber is too small and the positioner sensitivity is set too high, leading to surge. This occurs because, when the input signal changes, the positioner’s output air pressure rises far beyond the required level.

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09

2017-09

What is the principle of a valve positioner?

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2017-09-14

Principle of the valve positioner: The feedback lever detects changes in the valve opening position. When the electromagnetic torque generated by the input signal equals the torque produced by the positioner’s feedback system, the force-balance system of the positioner reaches equilibrium, and the positioner stabilizes. At this point, the input signal is proportionally related to the valve position. However, if the input signal changes or external forces such as fluid flow act on the system, the equilibrium of the force-balance system is disrupted, resulting in an imbalance between the force exerted by the magneto-electric assembly and the force generated in the feedback loop due to changes in the valve stem position. As a result of the action of the nozzle and baffle, the output pressure of the positioner’s air supply changes, thereby affecting the actuator.

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