Technical assistance request

2010-02-09View Original

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In the range of 0-100%, the valve stem of this control valve keeps moving up and down between 50%-55% only. Could everyone please help me understand what the cause of this is?

Reply #22010-02-10

Resonance is caused by the valve stem and the fluid; this usually occurs because the parameters necessary for proper selection calculations are not taken into account. In the case of valves with plastic lining, manufacturers consider only the valve body and the valve core, without accounting for factors such as the thickness of the plastic lining, which leads to vibration.

Reply #32010-02-10

Recheck the process conditions and have the manufacturer recalculate

Reply #42010-02-10

The phenomenon you mentioned isn’t very clear; I’m not sure what kind of valves you are using

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