the rotor 3 blocks liquid flowing through to the tube 2 as there is always at least one compressing element 4 pressing on the tube 2 and thereby closing it in the example shown the rotor 3 of the peristaltic pump 1 has eight compressing elements 4 the rotor 3 of the peristaltic pump 1 is driven by a dc motor 5 via a transmission 6 and a drive shaft 7 the dc motor 5 is controlled by an electronic controller 8 for example a microprocessor that monitors by means of a sensor 9 rotation of the rotor 3 and thereby the infusion rate the infusion device shown in fig1 comprises a mechanical stop facility for stopping the pump 1 by mechanically blocking pump motion the stop facility comprises a locking plate 11 which is connected to the drive shaft 7 and a locking member 12 which interacts with the locking plate 11 in order to lock the drive shaft 7 the locking member 12 engages a recess of the locking plate 11 the locking member 12 is biased by spring 13 against the locking plate 11 when the locking member 12 has engaged the locking plate 11 the drive shaft is locked and the stop facility has to be reset by the controller 8 to continue an infusion only after the stop facility has been reset further pumping motion is possible in the example shown the controller 8 resets the stop facility by means of an actuator 14 for example a solenoid in order to reset the stop facility the actuator 14 moves the locking member 12 out of its engagement position in which it protrudes into the recess of.