Valve repair
Thread Content
The valve manufacturer repaired and replaced the spare parts; the original closing degree was 30%. 25% traffic is quite high right now. I’m worried that the pump might get damaged; what could be the reason? Thank you
Don’t you check whether the on-site settings match those at the control room? Which pump could get damaged as a result of this?
After the valve is installed, its opening degree needs to be tested. At the zero, 50%, and 100% positions of the valve, it is necessary to check whether the actual opening degree of the valve matches the values indicated on the scale. Also, the operation should be based on process parameters, rather than the valve opening degree. The valve opening can only be a reference opening. For reference.
Please check whether the flow rate is correct; if it is, use that value as the standard, as the valve position can only be used for reference
The valve opening is only a reference value; if the outlet flow exceeds 30% of the pump’s rated flow, the pump will not be overloaded.
To determine whether there is pump cavitation, one needs to look at the flow rate; the opening degree of the valve affects the flow rate. As long as the flow rate is sufficient, there is no issue with pump cavitation. There is always some error in the valve’s opening degree. If your control valve has a feedback signal, it is possible to see that there is a discrepancy between the value output by the control valve and the actual value. A deviation of 5% is considered relatively large, but it is still within normal limits