I have a tower kettle pump with a control valve at its outlet; when the flow rate is high, the control valve vibrates. This vibration stops when a bypass is used. What is causing this?
Thread Content
I have a tower kettle pump with a control valve at its outlet; when the flow rate is high, the control valve vibrates. This vibration stops when a bypass is used. What is causing this?
Control valves come in electric, pneumatic, and self-acting types. Vibrations can occur in pneumatic valves; they may be related to fluid pressure, resulting from a conflict between the forces acting on the valve stem and the signal pressure in the valve cylinder, or caused by impacts between the valve head and the fluid at certain points. This is provided for reference only.
The selected control valve might be too small, resulting in vibrations due to sudden throttling
The valve operates at a low pressure and has a small diameter.
The poster said that the valve with high flow rates vibrated; by opening a bypass, the vibration stopped once the flow rate decreased. It’s likely that the actuator chosen is too small, resulting in insufficient thrust and stiffness.