Regarding the backflow issue of the pump
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Is it necessary to have a small amount of backflow at the pump outlet as well, in addition to the large amount of backflow?
Is it necessary to have a small amount of backflow at the pump outlet as well, in addition to the large amount of backflow?
It’s not necessary anymore; I think just having sufficient reflux is enough!
What are large reflux and small reflux? Generally, if the flow rate of the pump you choose is too high, you can calculate what the return flow rate should be based on the ratio of the diameters of the main pipe and the return pipe; or conversely, you can determine the diameter of the return pipe based on the flow rate.
The question posed by the original poster isn’t very clear. Generally speaking, pumps require a minimum backflow rate; a pump protection valve, also known as an automatic control backflow valve, can be used to ensure this rate and thus maintain the proper operation of the pump. Does the poster mean that there should be a separate large backflow pipeline controlled by a separate control valve, and is it still necessary to have the low-flow protection provided by the automatic control backflow valve?
Any pump that feeds into an intermediate container should have a small backflow. By \"large backflow\" is meant a situation in which the pump’s outlet flows through certain devices before returning to the pump’s inlet (this is how we refer to it in our factory), and especially those pumps with flow control mechanisms must have a small backflow.
I haven’t understood the original poster’s question yet. Does “minor backflow” refer to mistaking the heat pump line for a backflow line? I hope the original poster can express the issue more clearly.
I think the term \"large return flow\" used by the original poster refers to the line that leads from the outlet to the tank or the buffer tank; this is usually found on the high-pressure pump and represents the minimum flow rate. As for the \"small return flow\", it refers to the preheating line, which is used to preheat the pump – I can’t think of any other meanings for it
It depends on the specific circumstances and the particular pump. I hope the original poster can explain in detail.
Generally, only one return flow is needed. Of course, if the large recirculation flow cannot meet the pump’s minimum continuous operation flow requirement, a smaller recirculation flow may need to be considered. You need to explain this in detail.
If it is necessary to adjust the backflow, there should be a lower level of backflow, as this makes adjustment easier; a high level of backflow makes adjustment difficult.