Centrifugal pump
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When the centrifugal pump is started, is it necessary to turn on the reflux valve? Will this affect the operation of the pump?
When starting a centrifugal pump, the outlet valve should be closed and then opened gradually. Recirculation only adjusts the required flow rate and does not affect the operation of the pump.
Should it be a cryopump or a room-temperature pump? If it’s a room-temperature pump, there’s no need to design a reflux system； If it is a cryopump, it is best to open it to a certain degree when starting up in order to create a pressure difference.
The outlet valve should be closed, then slowly opened. Recirculation only adjusts the required flow rate and does not affect the operation of the pump.
Multi-stage centrifugal pumps, or centrifugal pumps with high head and large flow rates, are typically equipped with a minimum flow line. This is done to ensure that a certain amount of flow passes through the pump when it is started, thereby preventing cavitation and resulting heat generation. Such pumps are often used in the transportation of liquid hydrocarbons. When starting the pump, the outlet should be closed while the minimum flow line is kept fully open; once the pump has stabilized after starting, the outlet can be gradually opened and the minimum flow valve can be reduced
Before starting the centrifugal pump, the outlet valve must be closed, and air must be exhausted to ensure the pump is properly filled (otherwise, no pressure will be generated; I have encountered situations where the pump did not produce pressure due to insufficient filling). Then, when starting the pump, the outlet valve should be opened slowly
If the medium is prone to vaporization, it is necessary to install vent lines; this is not required for others