China Deep Well Pumps Manufacturers

The intersection of the pump characteristic curve Q-H and the pipeline characteristic curve Q;h is the limit operating point of the pump when the valve is fully opened. Frequency conversion speed regulation The deviation of the working condition point from the high-efficiency zone is the basic condition for the pump to need speed regulation.

2. This method is easy to operate, continuous in flow, and can be adjusted between flow and zero at will, and no additional investment is required, and it is applicable to a wide range of occasions. When the valve is fully closed, it is equivalent to infinite resistance and zero flow.

Obviously, compared with valve throttling, the energy saving effect of frequency conversion speed regulation is very prominent, and the working efficiency of horizontal multistage centrifugal pumps is higher. When the valve is closed, the local resistance of the pipeline increases, the pump operating point moves to the left, and the corresponding flow decreases. It can be seen that when the valve is closed to control the flow, the water supply capacity of the multi-stage centrifugal pump itself remains unchanged, the head characteristics remain unchanged, and the pipe resistance characteristics will change with the change of the valve opening. At this time, the pipeline characteristic curve coincides with the ordinate. , Thereby eliminating the destructive water hammer effect to a large extent, greatly extending the life of the pump and piping system..

The simple way to change the flow rate of a centrifugal pump by valve throttling is to adjust the opening of the pump outlet valve, while the speed of the horizontal multistage centrifugal pump remains unchanged (generally the rated speed), which is essentially to change the pipeline characteristics The position of the curve changes the working point China Deep Well Pumps Manufacturers of the pump. When the rotation speed of the multistage centrifugal pump changes, the valve opening remains unchanged, the pipeline system characteristics remain unchanged, and the water supply capacity and head characteristics change accordingly

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