What are Positive Displacement Pumps?
Positive displacement pumps move liquids through valves and piping that enclose fixed volumes of fluids and then transfer them through a system. They cyclically pump these measured capacities, driven by diaphragms, gears, lobes, pistons, screws, vanes, or other implements. They’re generally used for applications involving viscous liquids, such as oils or slurries. Positive displacement pumps are especially desirable when these viscous fluids are highly pressurized, such as what happens in the processing of emulsions, certain types of food, and biological fluids, or when precise measurements are required.