Fisher - Fisher's FAQs

Create Date: 2024-8-30 12:03:23|Source: Fisher

In the use of Fisher Valve Positioner Control Valve, we may encounter some different situations, such as: positioner signal conditioner force instability, pneumatic valve source regulator force instability, positioner without pneumatic valve, etc., the following editors will introduce these situations.

The Fisher Fisher Valve Positioner Regulator Signal Regulator is unstable, usually due to the inappropriate time constant of the control system, we can re-set the time constant and adjust it to the appropriate time constant. The instability of the valve positioner control valve is generally due to the leakage of the output line; The actuator is too small; The nozzle baffle of the amplifier is not parallel, and the baffle cannot cover the nozzle; The ball valve of the amplifier is not tightly closed by dirt wear, and the output oscillation will occur when the amount of pneumatic valve consumed is particularly increased; The friction resistance in the movement of the valve stem is large, and there is a blockage phenomenon with the contact part, etc., we can solve them one by one according to these reasons. The valve positioner has a signal, but the reason for no action: the spring of the actuator rusts due to long-term use; The spool and seat are stuck; Broken or bent stems; The spool falls off; Burnt dirt in the seat or frozen spool can be used to determine the cause of the non-action.

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