Displacement pumps

Displacement pumps are divided into two main groups:

• Oscillating pumps (e.g. piston or diaphragm pumps), which operate by means of oscillating or back-and-forth moving elements.
• Rotating pumps (e.g. gear, rotary piston or rotary vane pumps), which convey the medium by means of rotating mechanisms.

All displacement pumps are based on the same basic principle: with each stroke (in oscillating pumps) or each revolution (in rotating pumps), a constant volume is transported from the suction to the pressure area. Since the system has no natural pressure limitation, the installation of an overflow or safety valve is essential to prevent damage in the event of overpressure.

Advantages overview:

• High pressure capability: Ideal for applications with high differential pressures or delivery heads at low flow rates.
• Low-pulsation delivery: Despite the displacement technology, many models offer uniform flow thanks to their optimised design.
• Robustness under fluctuating conditions: They deliver constant volumes even when the pressure difference in the process varies – ideal for stable process control.
• High efficiency: Depending on the application and delivery principle, particularly efficient solutions can be implemented.