Peristaltic pump

A peristaltic pump comprising

• a casing which has a casing bottom, a casing cover and a casing wall extending from the casing bottom to the casing cover, which form a pump chamber, and a casing inlet and a casing outlet which respectively provide a communication with the pump chamber,
• a tube which connects the casing inlet to the casing outlet and is arranged within the pump chamber, and
• a displacement element which has at least two displacement members and is fixed to a rotor which is rotatable about a rotor axis so that in the rotary movement of the rotor each displacement member performs a movement in an operative plane, wherein the tube is arranged between the casing wall and the displacement element in such a way that due to rotation of the rotor the displacement members slide or roll on the tube so that the tube is squashed together and a medium to be conveyed which is in the tube is displaced in the direction of the casing outlet,
• characterised in that
• the displacement element is of a two-part structure comprising a first part which is fixed to the rotor and a second part which has a displacement member, wherein the second part of the displacement element in at least one position of the rotor relative to the first part of the displacement element can be reciprocated between an operative position in which the operative planes of the two displacement members are identical and a change position in which the operative planes of the two displacement members are arranged parallel to each other.