Method of changing flow rate of centrifugal high temperature

A.

For a pump, the characteristic curve does not change, while the line characteristic salt line does.

B.

When the flow provided by the working point of the pump can not meet the flow required under the new conditions, it should try to change the position of the working point of the pump, that is, the need for flow regulation.

C.

The methods of flow regulation are:

A regulating valve is installed on the outlet line of the centrifugal pump to change the opening of the valve, that is, to change the B value of the pipeline characteristic curve HE-A + BQE2. The valve is opened large and the working point is far away from the longitudinal axis.

The valve is closed, the working point is close to the longitudinal axis of the advantages of this adjustment method is simple and flexible.

The disadvantage is that when the valve is closed, the resistance in the pipeline increases.

Energy loss increases.

, so that the pump can not work in the highest efficiency area.

It's not economical.

Use the method of changing the valve opening to adjust the flow rate is often used in the flow rate adjustment range is not big, and often need to adjust the occasion.

Change the speed of the pump, that is, change the characteristic curve of the pump.

Turning the outside diameter of the impeller also alters the pump's characteristic epistaxis.