Stainless steel centrifugal pump flow control - what are the methods

stainless steel centrifugal pumps are widely used products, widely used in petroleum, petrochemical, chemical, steel, electricity, food and beverage, pharmaceutical and water treatment industries. How to control the economy effectively pump output flow caused much discussion. Once popular entirely through frequency conversion to control the output flow rate, and cancel all flow control valve control type. Widely used at present, the market there are four kinds of methods: export regulating valve, by-pass valve adjustment, impeller diameter adjustment and speed control. Now let's analyze and discuss the characteristics of each method.

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shenzhen centrifugal pump manufacturers recommend stainless steel centrifugal pump flow of common control methods:

1, the outlet valve opening adjustment

in this method, and export pipeline pump regulator series. Its actual effect as if adopted a new pump system. Large output of pump pressure head did not change, but the flow curve attenuation.

2, by-pass valve adjustment

in this method, valve and pump in parallel connection. Its actual effect as if adopted a new pump system. Change large pump output pressure head, flow curve characteristics also change. Flow curve is more close to linear.

3, adjust the impeller diameter

this method without using any external components, and the flow characteristic curve changes as the change of diameter.

4。 Speed control

changes in the velocity of the impeller directly change the flow curve of the pump, and the characteristics of the curve remains the same. When reduced speed, the curve flattens, head and large flow rate is reduced.

1) The overall efficiency of pump system

outlet valve adjustment and by-pass adjustment method can increase the pipeline pressure loss, and reduce the efficiency of the pump system. The adjustment of the impeller diameter has little influence on the efficiency of the pump system, as long as the speed of less than 50% of the normal speed, speed control method basic does not affect the efficiency of the system.

2) Energy levels

hypothesis through the above four methods will pump output flow from 60 m3 / h to adjust to the 50 m3 / h, when the output is 60 m3 / h power consumption is 100% ( The head is 70 m) Several control methods, what is the effect of flow of the pump power consumption?

( 1) Adjust export valve opening, energy consumption is 94%, the greater the flow rate, the lower energy consumption.

( 2) The bypass regulation. Bypass valve cut the head of the pump to 55 m, this can only be done by increasing the flow of the pump head, led to a 10% increase in energy consumption.

( 3) After adjusting impeller diameter, reducing the impeller diameter, reduce the output flow and pressure of pump will be reduced to 67% of energy consumption.

( 4) Speed control, speed is reduced, the pump flow rate and pressure head is reduced, energy consumption reduced to 65%.