Used to move precise volumes of liquids in a designated time period in order to provide accurate flow rates, a metering pump has been doing its work for 75 years. In that time, more advancements have been made to this kind of pump than to any other. Almost all of the attention has been focused on controlled limitation of flow, and to this end, modern technology, including the use of robotics, has brought many improvements to the pump’s self-contained flow management system.
All About Discharge Pressure
Metering pumps are rated with the capability of pumping into a high discharge pressure. They are normally designed to meter at constant, or almost constant, flow rates within a range of discharge or outlet pressure conditions. The user should confirm that the pressure and temperature ratings are consistent with the application as well as the type of liquid to be pumped. An experienced supplier will be able to assist with the proper choice from among a selection of metering pumps. Click here to learn more about pump types and models.
How the Pump Works
There are two stages of operation: the suction stroke and the discharge stroke. During the suction stroke, liquid is pulled into the pump cavity, past the inlet check valve. During the discharge stroke, the inlet check valve shuts down and the liquid is ejected through an outlet valve. There is usually a pump head, driven by a motor, through which the liquid travels on its way in and out of the pump. The user can vary capacity automatically or manually as the process requires.
Drive Meets Accuracy
Accuracy is critical in controlled-volume metering pumps. Whether the user’s mission is to maintain constant flow or facilitate the delivery of additives to automated processes, a metering pump is a good choice. State-of-the-art technologies have contributed to capacity control, and different kinds of pump heads have resulted in new and different applications for which these pumps can be used. The drive system selection is also important because it is directly connected to accuracy, durability, automation levels, maintenance issues and cost.
The Need for Speed
The many versions and styles of controlled-volume pumps have evolved over the decades. The variety of metering pumps available in the marketplace today is largely the result of industries’ needs for accuracy in chemical dosing. Many controlled-volume pumps use stroke length coupled with stroke speed adjustments to deliver capacity variation. Nevertheless, state-of-the-art electronics that provide both pin-point accuracy and wider speed differentiation have almost eliminated the need to vary stroke length, thereby helping to avoid hydraulic issues when pumps are run at less than full stroke.
Going Confidently Into the Future
A metering pump is sought after in applications involving high system pressure or where a high accuracy feed rate is required. It is frequently used in the handling of corrosive or hazardous fluids. Although the metering pump has historically been considered a somewhat minor member of the pump family, it definitely has its niche and the advancements keep on coming. Tweaks to the pump’s self-contained flow management will continue and the automatic capacity correction feature that is now available is on track for further enhancement. It is anybody’s guess what advancements the next 75 years will bring.
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