are pumps based on the replacement principle. They are self-priming and the fluid is transported via the membrane. A piston or an eccentric screw behind the membrane is responsible for the movement and can control the size of the piston stroke and adapt the delivery to current process requirements. The single-use quattroflow pumps produced by the company Almatechnik Maschinenbau are based on four-piston membrane technology 45. These single-use pumps can be easily exchanged as the whole pumping chamber is disposable.