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  Positive displacement pumps are a kind of vacuum pump that moves liquids at a constant speed. These pumps are used in wastewater treatment systems, but are not as effective at handling low-viscosity liquids as centrifugal pumps. To understand these pumps better, read on! :) Here are some important facts about them: Positive displacement pumps are a type of vacuum pump A positive displacement water pump works by transferring a constant volume of liquid in and out of a chamber. The liquid flows between two gears that mesh and are separated by a movable diaphragm. As the gears rotate, the pressure inside the pumping chamber decreases. This back pressure forces the fluid out of the discharge port. The pumping rate and pump speed are used to control the back pressure. Positive displacement water pumps are a type of liquid pump that use the principle of partial vacuum. They work by drawing a volume into a sealed chamber, expanding the chamber and exhausting the gases to the atmosphere. Pos