What do I need to pay attention to when choosing a valve positioner?

When it comes to the valve positioner, I believe many people know that it is one of the most important accessories on many occasions. In the valve positioner market, there is no shortage of brands that do well. Our common brands are Siemens valve positioner, ABB valve positioner, Fischer valve positioner, Yamabu valve positioner and so on. No matter which brand of valve positioner, when we choose the valve positioner, we must follow the most basic principles and only choose the valve positioner that suits our own needs. At this time, we need to pay attention to the necessary matters when selecting the valve positioner! So, when choosing the valve positioner, what do we need to pay attention to?

Heavy load

Under ideal conditions, in response to a certain input signal, the internal parts of the regulator (TrimParts, including the ball/spool, stem, seat, etc.) should be accurately positioned in the required position each time, regardless of the direction of the stroke or the amount of load borne by the internal parts of the regulator.

How stable is the zero point and range of the valve positioner?

If zero points and ranges are prone to drift with changes in temperature, vibration, time, or input pressure, the valve positioner needs to be re-adjusted frequently to ensure that the stroke action of the regulator is accurate.

Is it easy and convenient to adjust the zero point and range of the positioner?

Can zero and range be adjusted without opening the lid? But it’s worth noting that sometimes, in order to avoid incorrect (or illegal) operations, this kind of arbitrary tuning needs to be prohibited.

Can the valve positioner achieve “Split_ranging”?

Whether the valve positioner can achieve “Split_ranging” is easy and convenient to achieve “splIT_ranging”; Having a “split range” function means that the valve positioner responds only to a certain range of input signals (e.g., 4 ~ 12mA or 0.02 ~ 0.06MPaG). Therefore, if you can “split”, you can control two or more control valves according to actual needs with only one input signal.

It is required to meet the field conditions and realize the requirements of intelligence

The selection of intelligent valve positioner is to obtain its intelligent function and improve the overall control performance. Therefore, under the condition of meeting the field conditions, intelligence is an important reference, including its communication function, online or offline fault diagnosis function.

In some special cases, ensure the normal operation of remote installation

Many large petrochemical enterprises use more and more joint central control rooms, so the distance from the control room to the field intelligent valve positioner may be very far, must consider the cable voltage drop, otherwise it will affect the valve positioner can not work normally.