Multiple displacement pump

A multiple displacement pump having

• a pump housing that comprises a first lid (2) that lies on the outside and a second lid (3) that lies on the outside, and at least one intermediate piece (4) that is accommodated between the lids (2, 3),
• wherein at least a first fluid chamber (5) and a second fluid chamber (8) are formed between the lids (2, 3) and the at least one intermediate piece (4),
• wherein the first and second fluid chambers are divided, using at least one displacer element (11, 12), in each instance, into at least one propellant chamber (6, 9) and one media chamber (7, 10), and
• wherein the displacer elements (11, 12) of the first and second fluid chambers (5, 8) are connected, with force fit and releasably, to at least one lifting rod (14) by way of at least one connection element (13),
• wherein the at least one lifting rod (14) can extend the at least one connection element (13) through a first passage (16) of the adjacent first lid (2),
• wherein the lifting rod (14) is connected to a first mechanical actuator using releasable connection means (43), in such a manner, with force fit but releasably, that the drive can be removed and a different drive can be affixed to the lifting rod (14), wherein specifically either a pneumatic or an electric drive can be adapted, and
• wherein the first mechanical actuator is releasably connected to the first lid (2) on an outer side of the first lid (2), which faces away from the first fluid chamber (5).