Generally, the minimum flow rate of a centrifugal pump is 30% of the rated flow rate.
If the pump runs in a small flow area for a long time, the hazards that the pump housekeeper thinks of are:
1. The temperature in the small-flow pump increases for a long time, which is easy to cause cavitation and damage the impeller. The solution can be: install a return pipe, use the return pipe valve to control the actual flow rate, and prevent the pump from running under small flow conditions, which has served the purpose of protection.
2. Long-term operation with small flow, the pump is always in a pressure-holding state, which causes the pump to vibrate too much and shorten its life. If the deviation from the reasonable working area of the pump is too large, it will inevitably cause damage to the pump. The solution can be: cutting the impeller (the most economical and practical method).
3. Efficiency drops and power is wasted
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