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Selection Criteria for Valve Positioners
Release time:
2026-04-07 15:22
In such a wide range of control applications, valve positioners have become one of the most critical accessories for control valves. Particularly in certain specialized applications, selecting a valve positioner that is well-suited or performs optimally involves considering numerous factors. Below, we will examine the criteria for making such a selection.
First, it is necessary to determine whether the valve positioner supports staged control. The ease and convenience of implementing staged control are important considerations: the presence of this function indicates that the valve positioner responds to a specific range of the control signal. Therefore, with staged control capability, operations can generally be tailored to actual needs; a single control-signal connection can be used to sequentially control two or more regulating valves. Thus, this point must be given close attention.
Another important consideration is whether zero-point and span adjustments can be performed easily and conveniently—specifically, whether these adjustments can be made without opening the instrument housing. However, it is crucial to note that, in order to prevent improper or unauthorized operations, such unrestricted adjustment capabilities should generally be prohibited. Therefore, there are many factors to consider when making a selection; it is advisable to evaluate and choose based on the performance characteristics of the valve positioner, so as to acquire a high-quality device.
2020-01-19
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