The figure shows a common form of lobe pump. A cavity is formed and the material is pushed along the interior of the case to the discharge. As the lobes mesh in the middle of the pump this prevents bypass or backflow of process material.
Translated into Telugu by <a href="//commons.wikimedia.org/wiki/User:Mekala_Harika" title="User:Mekala Harika">User:Mekala Harika</a>
2019-03-05
Own work by <a href="//commons.wikimedia.org/wiki/User:Jahobr" title="User:Jahobr">User:Jahobr</a>