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09

2019-09

Explanation of the Operating Principle of Valve Positioners

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2019-09-25

With the advancement of smart instrumentation technology, microelectronics has been widely integrated into conventional instruments, significantly enhancing their functionality and performance. The valve positioner is a key accessory for control valves and is typically used in conjunction with pneumatic control valves. It 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 valve positioner via a mechanical linkage, and the valve position information is transmitted to the higher-level system in the form of an electrical signal.

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09

2019-09

Basic Knowledge of Valve Positioners

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2019-09-02

Valve positioners come in a wide variety of designs, including pneumatic, electric, and smart models. Typically, the control valve is the most critical accessory for such positioners, as they are generally used in conjunction with pneumatic control valves. The positioner receives the output signal from the controller and uses this signal to regulate and operate the valve. Once the control valve is in operation, various feedback mechanisms can transmit information back to the valve positioner, which then reports this data to the higher-level control system.

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08

2019-08

Analysis of Two Common Issues with Smart Valve Positioners

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2019-08-31

Among the auxiliary devices for control valves, the intelligent valve positioner stands out as both critical and primary; it is an accessory specifically designed for control valves. Thanks to its positioning capability, it can counteract imbalances caused by pressure fluctuations resulting from the process medium. Conversely, it enables the valve to respond rapidly and accurately, thereby delivering precise control signals. Consequently, whether in smart or electronic applications, the use of valve positioners is extremely widespread, significantly enhancing their functionality and performance.

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08

2019-08

Pipeline pneumatic valves can be used in conjunction with valve positioners to achieve proportional control.

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2019-08-26

Why is it said that valve positioners can be used in conjunction with pipeline-type pneumatic valves? Pipeline-type pneumatic valves refer to various pneumatic components in a pneumatic system that control the pressure, flow rate, and flow direction of compressed air, thereby ensuring the normal operation of pneumatic actuators or mechanisms. Components that control and regulate compressed-air pressure are called pressure-control valves; those that control and regulate compressed-air flow are called flow-control valves; and those that change and control the flow direction of compressed air are called directional-control valves.

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07

2019-07

Introduction to Common Fault Analysis of Intelligent Valve Positioners

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2019-07-24

The valve positioner has signal input but no output pressure signal: for electro-pneumatic positioners, there is a foreign object between the armature and the coil frame; the constant orifice is blocked; the nozzle-flapper assembly is improperly fitted or the nozzle-flapper is damaged; the diaphragm in the amplifier (whether metal or rubber) is damaged; there is an incorrect air-line connection (including the amplifier); the positive and negative terminals of the electro-pneumatic positioner’s input signal cable are reversed; the diode inside the positioner’s input junction box is open-circuited or the wiring is faulty; the air-supply pressure does not meet the specified requirements; the amplifier’s air consumption exceeds its rated value by too much; the polarity of the magnet in the electro-pneumatic positioner is installed incorrectly; the preloading force of the amplifier is excessive; or the spool in the spool-type amplifier is obstructed by a foreign object.

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07

2019-07

Common Faults of Valve Positioners and Their Root Cause Analysis

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2019-07-11

What is a valve positioner? It is a critical accessory used to regulate valves and is typically employed in conjunction with pneumatic control valves. The basic operation involves the positioner receiving signals from the controller and, in response, precisely controlling the pneumatic control valve. As the valve stem moves, mechanical feedback is sent back to the positioner, which then relays this information to the higher-level control system. Next, we will discuss some of the common faults that can occur in valve positioners.

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