Under what circumstances is a bypass needed at the pump outlet?
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I would like to ask everyone: Under what circumstances is it necessary to have a bypass at the pump outlet?
If bypass backflow is used to regulate flow, then all positive displacement pumps must have a bypass backflow for flow regulation. Centrifugal pumps should also have a bypass return when there are large variations in the operating flow rate; moreover, a bypass return is necessary when the pump is used to transport slurries, to prevent pipe blockage due to too low flow rates.
Besides control valves, there are generally three situations； 1) The temperature of the medium being transported is high; to prevent high-temperature liquid from returning during pump shutdown ； 2) Protect the outlet check valve when the high-pressure pump is started ； 3) When transporting high-viscosity liquids.
In many cases, it is necessary to install a return system for pumps used in certain industries; for example, in the case of cryogenic pumps, return valves and return pipelines are generally required at the outlet of positive displacement pumps to prevent overpressure. If the flow rate required at the downstream end varies greatly, a return pipeline is also needed. In short, there are many such situations. To ensure better operation of the pumps, it is usual to require the installation of return pipelines
Are the return pipeline and bypass you mentioned the same thing?
In my designs, I create branch paths solely to enable pumping for circulation or to direct flow to various locations; I haven’t considered backflow. I hope someone experienced can explain this in more detail so I can learn from it properly
Do you mean small-diameter pipelines?
I want to learn *it a bit; are there any specific things? I seek advice from experts!
The functions of the minimum return line and the bypass are different; the bypass is provided to regulate flow and protect the outlet check valve. It still depends on the medium being transported.
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