A rotary vane pump is a type of positive displacement pump that uses a rotating mechanism to move fluids. It consists of a rotor with several vanes that slide in and out of slots as the rotor turns. This action creates a vacuum that draws fluid into the pump and then pushes it out through an outlet. These pumps are commonly used in various applications, including vacuum systems, air conditioning, and automotive systems. They are known for their ability to handle a wide range of viscosities and provide a steady flow rate, making them versatile and efficient for many industrial processes.