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07

2017-07

On what criteria should valve positioners be selected?

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2017-07-29

A valve positioner (also known as a pneumatic 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 positioner via a mechanical linkage, and the valve position is transmitted to the higher-level control system in the form of an electrical signal. In a wide range of control applications, the valve positioner is one of the most important accessories for control valves. In particular, when selecting the most suitable valve positioner for a specific application, the following factors should be carefully considered: 1) Valve positioning

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08

2017-08

What is the function of an electric valve positioner?

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2017-08-03

An electric valve positioner is a key accessory for control valves. It uses the valve stem displacement signal as the feedback measurement input and the controller output signal as the setpoint, comparing the two. When a deviation exists, it adjusts the output signal to the actuator, thereby driving the actuator to operate and establishing a one-to-one correspondence between the valve stem displacement and the controller output signal. Next, we will introduce the functions of an electric valve positioner: 1. Electric valve positioners are essential for control systems that demand high control quality, as they help improve the positioning accuracy of control valves and enhance their reliability. 2. Installation is recommended when the pressure differential across the valve exceeds 1 MPa.

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08

2017-08

What are the shortcomings of conventional valve regulators?

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2017-08-04

Control valves are the final elements in a control system; once they fail, the safe operation of the unit is directly compromised, with significant adverse effects on the production process. The use of smart valve positioners can enhance the flow characteristics and performance of control valves by enabling digital communication with DCS systems or fieldbus devices, thereby improving the enterprise’s process control capabilities and ensuring the safe and stable operation of the unit. Shortcomings of Conventional Positioners 1) Conventional positioners generally operate on the principle of mechanical force balance, employing a nozzle–flapper mechanism with numerous moving parts. As a result, they are highly susceptible to disturbances such as temperature fluctuations and external vibrations, exhibiting poor environmental robustness; moreover, the spring constant of the return spring is

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08

2017-08

Introduction to the Principle of Intelligent Valve Positioners

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2017-08-08

Smart valve positioners are primarily used to control and regulate control valves by acquiring the current control signal output from the controller and using pneumatic signals to adjust the valve. Once the control valve actuates, the valve stem undergoes a certain displacement, which is then transmitted as a feedback signal to the valve positioner. The positioner compares and analyzes the input control signal with the valve-position feedback signal; if the two signals differ, it activates the valve’s actuating mechanism until the signals match. When the two signals are identical, the actuating mechanism ceases to adjust the valve position. Smart electric valve positioners offer advantages such as high control accuracy, robust self-diagnostic capabilities, and high efficiency. Smart electric valve

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08

2017-08

Principles and Structural Standards of Valve Positioners

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2017-08-09

After adopting an electro-pneumatic valve positioner, the 0–10 mA or 4–20 mA DC current signal output by the electric controller can be used to operate the pneumatic actuator. An electro-pneumatic valve positioner performs the dual functions of an electro-to-pneumatic transducer and a pneumatic valve positioner. As shown in the figure, this is the schematic diagram of the operating principle and the actual physical view of a ZPD-2000 electro-pneumatic valve positioner. (1) The valve positioner comprises a torque motor assembly consisting of a permanent magnet 1, a magnetic core 2, a coil, an armature (i.e., the main lever 3), and an air gap; this assembly serves as the conversion element that transforms electrical current into force (torque). The magnetic core and the armature are made of high-permeability material.

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08

2017-08

Analysis of the Operating Principle of Valve Positioners in Regulating Output Air Supply Pressure

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2017-08-11

An electric valve positioner is one of the key accessories for pneumatic control valves, serving to convert the electrical signal output by the control unit into a pneumatic signal that actuates the valve. It provides valve positioning functionality by both overcoming stem friction and compensating for unbalanced forces caused by changes in process pressure, thereby enabling the valve to track the control signal rapidly and accurately, achieving fast valve positioning and enhancing control performance. Operating principle of intelligent electric valve positioners for regulating the output air supply pressure: 1) Output pressure regulation employs PID pulse-width modulation (PWM) technology, ensuring rapid and precise response. Due to the CPU’s ability to…

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