Page 3 | PD Pump Fundamentals, Design and Applications (Part Five): Metering Pumps

PD Pump Fundamentals, Design and Applications (Part Five): Metering Pumps - Page 3

Written by Hydraulic Institute PD Pump Members

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While convenience of flow rate adjustment can cause an engineer to initially consider variable capacity pump systems, the value diminishes quickly if the operator cannot depend on the pump repeatedly metering the same or planned variance of chemicals at the predetermined settings necessary to the process. The costs of compensating for variable capacity pumping systems that have low accuracy rates can be extremely high in the form of extra components in the system or poor quality results in the process (see Figure 4).

pd_m5_p23_fig4_web

Figure 4

Conclusion

Matching the right liquid end to the right drive mechanism is how this class of pumps provides operators with precise delivery of liquids. The metering pump has evolved from the original packed plunger heads to diaphragm liquid ends that incorporate sensors as a means of monitoring operation and accuracy.

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