In comparison to a smaller pump running at full / nominal speed, the larger diaphragm pump will not only benefit from fewer strokes for a given flow, but also running temperatures are reduced which provides advantages for both the motor and elastomers.ĭue to the nature of operation, a diaphragm pump supplies pulses of air rather than a linear flow. For example, a diaphragm pump with 12V DC motor can generally be run at 6 V providing approximately half the flow. If physical space allows, for applications requiring long life the designer should also consider selecting a larger diaphragm pump and running it at lower speed. As mentioned above, the elastomers of a diaphragm pump should also be selected depending on the application’s life requirements. And finally, the upper end of cost and life would be a diaphragm pump driven by brushless DC (BLDC) motor. Mid-range cost and life would be a diaphragm pump driven by a coreless motor. Lowest cost (and the associated lowest motor life) is a configuration of diaphragm pump which uses an iron core motor. The cost of a diaphragm pump is very sensitive to the choice of motor, since this is normally the most expensive component used in the pump’s construction. Applications range from systems which run 24 hours a day / 7 days a week to system where the diaphragm pump runs for just a few seconds per day. Matching the life requirements to a particular application is important when selecting the configuration of a diaphragm pump.
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