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2017-11

What are the categories of valve positioners in pneumatic control valves?

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2017-11-29

Pneumatic control valves can be classified according to their actuation mode into linear-stroke and angular-stroke types; according to the signal type, into pneumatic and electric types; and according to the operating principle of the valve actuator, into single-acting and double-acting types. In addition, based on the operating principle of the positioner itself, various forms, specifications, and models can be further distinguished. Below, a valve positioner manufacturer will provide a detailed introduction. A pneumatic control valve uses compressed gas as its power source, employs a pneumatic cylinder as the actuator, and, with the aid of accessories such as valve positioners, transducers, solenoid valves, hold-off valves, gas storage tanks, and gas filters, drives the valve to achieve on–off or proportional control, thereby receiving commands from industrial automation control systems.

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12

2017-12

Solutions for Uncalibratable Valve Positioners

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2017-12-08

In practical applications, valve positioners sometimes cannot be calibrated using conventional adjustment methods. This is because, under normal operating conditions, the zero-position spring operates within its linear range, with a limited range of length variation; consequently, the mechanical travel of the span-adjustment mechanism is also constrained, which in turn limits the adjustability of both the zero-spring length and the amplification factor of the span-adjustment mechanism. Under such circumstances, if the control valve being adjusted has a very large or very small amplification factor, it becomes exceedingly difficult to properly calibrate the positioner—effectively rendering the standard adjustment methods ineffective. However, as shown in Equation (4), we still have two additional parameters that can be adjusted: the spring constant of the zero-position spring and the effective length of the feedback lever. Since the adjustment

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01

2018-01

What role does a valve positioner play in control valve regulation?

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2018-01-08

Valve positioners are classified, according to their structure, into pneumatic valve positioners, electro-pneumatic valve positioners, and smart valve positioners. They are essential accessories for control valves and are typically used in conjunction with pneumatic control valves. A valve 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 valve positioner via a mechanical linkage.

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01

2018-01

Common Fault Types of Valve Positioners

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2018-01-17

A valve positioner receives the output signal from the controller and uses this signal to control the pneumatic control valve. Once the control valve actuates, the stem displacement is fed back to the valve positioner via a mechanical linkage, and the valve position is transmitted to the higher-level system in the form of an electrical signal. Also known as a pneumatic valve positioner, the valve positioner is a key accessory for control valves and is typically used in conjunction with pneumatic control valves.

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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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