The outlet flow of centrifugal pump to adjust the valve closed small, vacuum gauge and pressure gauge change?
The flow rate decreases, the loss is small, the vacuum of vacuum table decreases, the head increases, and the pressure of outlet pressure gauge increases
Centrifugal pump outlet valve closed, the flow becomes smaller, according to the performance curve of the centrifugal pump lift up, the outlet pressure will rise;After the flow rate decreases, the inlet velocity decreases, the pressure loss of the inlet pipe decreases, and the vacuum decreases.
The centrifugal pump is generally through adjusting the outlet flow control valve, outlet valve closed after the small pump flow becomes smaller, in accordance with the pump performance curve is due to the increased lift, outlet pressure gauge pressure will increase, the centrifugal pump is generally not set the vacuum meter, if in order to control cavitation vacuum is provided at the entrance the table, then because the flow rate decreases, the flow of small vacuum gauge instructions will become smaller, it is lower vacuum (absolute pressure)
