What is the minimum opening degree at the outlet of a centrifugal pump? Does the outlet of a variable-frequency centrifugal pump generally need to be fully open? What is the meaning of three inlet ports and one outlet port for the pump? Please have an expert explain it!

The outlet of the centrifugal pump can be adjusted to the minimum flow rate point (according to the pump’s flow curve). The outlet of a variable-frequency centrifugal pump generally cannot be opened fully, but there is a control valve downstream that allows it to be opened to full capacity. I don’t understand what your third point means at all.

1. If the outlet valve of a centrifugal pump is closed completely, over time this kinetic energy is not discharged, which causes the temperature of the fluid to rise gradually. Even up to the boiling point. Therefore, during actual operation on site, as long as the temperature of the medium rises to a level that does not cause it to vaporize and remains within the maximum temperature range permitted for the pump’s components, the opening degree of the outlet valve will be at its minimum allowable value. Explanation of knockoffs. The curve requirements still prevail. 2. The opening degree of the centrifugal pump outlet valve should be determined with reference to the rated current range. Because, without considering system pressure, the greater the flow rate, the greater the current. Everything is controlled in accordance with the parameters set for the entire system; remember not to go to extremes. Pursuing pressure without regard for flow rate, or pursuing flow rate without considering pressure or the limits of temperature and current. Article 3 is difficult to understand and hard to figure out; provided for reference only.

There was a typo in question three; it should be that the centrifugal pump is equipped with 3 inlet lines and 3 outlet lines. What significance does such an arrangement have for adjusting and adapting to various process flows?

For variable-frequency centrifugal pumps, if the outlet does not need to be fully open, is 50% an appropriate setting? If the current does not exceed its limit at the maximum speed, can the outlet be set to its maximum level? Is there an inevitable connection with the fluid medium?

For non-voltage-variable centrifugal pumps, to what extent should the outlet valve be opened in order for oil to flow out?