In a positive displacement pump, what is effectively reduced to maintain flow?

In a positive displacement pump, the maintenance of consistent flow is primarily achieved by reducing pressure. This type of pump operates by trapping a fixed volume of fluid and then forcing that volume through the discharge. When the pump's operation is consistent and demands arise from the system, the pressure needs to be adjusted to ensure the flow remains steady while still accommodating the system's requirements.

As the system encounters changes in resistance or back pressure, a positive displacement pump can reduce the pressure to maintain that necessary flow rate. This adjustment is crucial because if the pressure increases beyond a certain point, it could lead to system failures or damage to pump components. Therefore, controlling pressure is essential for the effective operation of a positive displacement pump and for ensuring that fluid moves continuously through the system without interruption.