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A Primer on Reciprocating Metering Pump Technologies

By Nils Kohlhase |

Understanding what technology is available is a first step towards selecting the right pump for metering applications Reciprocating metering pumps are problem solvers for difficult fluid-handling tasks and applications. Their main function is the metering of a precise fluid volume per stroke in a specified period of time. For this, the accuracy of the metering flow is the critical, value-added element of these pumps. They are used in different industries, such as the chemical, oil-and-gas and pharmaceutical industries for applications with partially specific properties. While operating pressures can range from atmospheric pressure to 3,500 bars, the properties of the fluids can be extreme. Examples are applications with very low or high temperature, very high or low viscosity, thixotropic fluid behavior, shear sensitivity, abrasiveness due to solid contents, toxic or corrosive behavior. Figure 1. These diagrams show the principle designs of a piston pump (left) and a diaphragm pump (right)[/caption] Basic constructions The pumps consist of two main elements: the drive element and the pump head, as shown in Figure 1. The drive element converts the electrical energy into the reciprocating movement of the plunger while the main task…
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