In an internal gear pump, how does the crescent seal function?

The crescent seal in an internal gear pump plays a critical role in the operation of the pump by maintaining the necessary separation between the meshing gears. It does not rotate, instead, it is fixed in position and serves as a barrier that helps create the suction and discharge chambers within the pump. This design ensures that the hydraulic fluid is effectively captured and moved through the system as the internal and external gears rotate around it.

By not rotating, the crescent seal remains effective in preventing backflow and maintaining pressure within the different sections of the pump. This allows the internal gear and external gear to mesh appropriately and facilitates the efficient transfer of fluid. Understanding the fixed nature of the crescent seal is key to grasping how internal gear pumps work and their effectiveness in various applications.