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Valve Positioner Selection Guide
Release time:
2026-04-07 15:22
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.
Among the many control applications, valve positioners are one of the most critical 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) Can the valve positioner implement “split-ranging”? Is it easy and convenient to implement split-ranging? The presence of the split-ranging 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-ranging is available, it is possible—based on actual needs—to use a single input signal to sequentially control two or more control valves.
2) Is it easy and convenient to adjust the positioner’s zero point and span? Can the zero and span adjustments be made without opening the enclosure? However, it is important to note that, in order to prevent incorrect or unauthorized operations, such unrestricted adjustment capabilities should sometimes be prohibited.
3) What is the stability of the valve positioner’s zero point and span? If the zero point and span are prone to drift due to changes in temperature, vibration, time, or input pressure, the valve positioner will need to be frequently recalibrated to ensure accurate and reliable stroke operation of the control valve.
4) Under ideal operating conditions, the positioning accuracy of the valve positioner ensures that, for a given input signal, the trim components of the control valve—including the ball or valve plug, stem, seat, and other internal parts—are consistently and precisely positioned at the required setpoint, regardless of the direction of travel or the magnitude of the load borne by the trim components.
2020-01-19
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