A Positive Displacement Pump is a type of pump that moves fluid by trapping a fixed amount of it and forcing that trapped volume into the discharge pipe. This mechanism ensures a consistent flow rate, regardless of the pressure in the system. These pumps are commonly used for applications requiring precise flow control, such as in the food and beverage industry or for hydraulic systems. There are various types of positive displacement pumps, including gear pumps, diaphragm pumps, and piston pumps. Each type operates on the same basic principle but uses different methods to achieve fluid movement. Their ability to handle viscous fluids makes them ideal for applications like oil transfer and chemical processing.