What does 7+3 on the pump’s nameplate refer to regarding flow rate?
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What does 7+3 on the pump’s nameplate refer to regarding flow rate? Generally, the nameplate shows just a number; I encountered a plus sign for the first time – could everyone please help me!
Which pump has this written on its nameplate?
The flow rate is very low, and there is no suitable pump type; therefore, it is necessary to increase the flow rate, taking into account both the minimum continuous flow rate and the rated flow rate
It is guessed that the rated capacity is 7 m3/h, with an additional 3 m3/h of backflow; thus the actual flow rate of the pump is 10 m3/h, as this value is quite low and close to the pump’s minimum flow rate.
Agree with the opinion above; 3 is the minimum return flow rate.
What is backflow, and why does a pump need backflow?
Agree with the fourth floor. . . Sometimes the data volume provided by the customer is too small. . . It is difficult for normal pump types to achieve this; therefore, choose a larger flow rate for backflow. I used to write it this way. .
Is it 10 m3 during normal operation, with 3 going back and 7 being sent downstream?
When this pump is in operation, there is no requirement specified for the minimum reflux level