A diaphragm pump is a type of positive displacement pump that uses a flexible diaphragm to move fluids. When the diaphragm moves up and down, it creates a vacuum that draws fluid into the pump and then pushes it out through a discharge valve. This design allows for efficient pumping of various liquids, including those that are viscous or contain solids. These pumps are commonly used in industries such as chemical processing, water treatment, and food and beverage. They are known for their ability to handle corrosive fluids and provide a leak-free operation, making them suitable for applications where contamination must be avoided.