How to determine the specific type of water ring vacuum pump to determine what series of pumps to choose, you can press the maximum flow, (in the absence of maximum flow, usually desirable 1.1 times the normal flow as the maximum flow), take 5% -10% margin After the lift of the two main parameters of performance, in the spectrum or series of characteristic curve to determine the specific model. The operation is as follows: Using the pump characteristic curve, find the required flow value on the abscissa and find the desired lift value on the ordinate, draw the vertical or horizontal lines from the two values ​​respectively, the intersection point of the two lines just falls in the characteristic curve Then the pump is the pump to be selected, but this ideal is generally very small. Usually encounter the following two situations: The first: the intersection point in the characteristic curve above, indicating that the flow to meet the requirements, but the lift is not enough, this time, if the lift is about the same, or a difference of about 5%, can still be used, if the head difference A lot, then choose the larger head pump. The second: the intersection point below the characteristic curve, in the fan characteristic trapezoidal trapezoidal range, the initial set under this model, and then according to head difference between the number to decide whether to cut the impeller diameter, if the head difference is small, do not cut, if According to its ns and cutting formula, cutting impeller diameter, if the intersection does not fall within the range of fan-shaped trapezoid, should choose a smaller head of the water ring vacuum pump.
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