Positive displacement pumps move fluids by trapping a fixed volume and displacing it through the system, ensuring a constant flow rate regardless of pressure changes. These pumps are ideal for viscous, shear-sensitive, and precise dosing applications. Common types include gear pumps, lobe pumps, diaphragm pumps, peristaltic pumps, and piston pumps. Used in food and beverage, pharmaceuticals, and chemical processing, they provide accurate fluid transfer while maintaining product integrity.