An outpatient infusion apparatus is described which includes a pump lead unit (2), a valve lead unit (1) and a control unit (40). the pump driver unit (2) includes a pump driver (20) and a pump driver (21), wherein the pump driver (21) is designed for coupling to a piston (302) of a pump unit. measurement (30) to transmit pump driving force and / or pump driving torsional force from the pump driver (20) to the piston (302). The valve driver unit (1) includes a valve driver (10) and a valve driver (12) coupled to the valve driver (10), wherein the valve driver (12) is designed for coupling to a valve unit. valve (31) to transmit a valve switching force and / or valve switching torsional force from the valve driver (10) to the valve unit (31). control unit (40) is configured to control repeated execution of a sequence of: a. operating the valve driver (10) to switch the valve unit (31) to a fill state； B. operating the pump driver (20) to move the piston (302) in the retracting direction； ç. operating the pump driver (20) to move the piston (302) to forward direction, wherein the forward direction is opposite the retraction direction at a clearance compensation distance； d. operating the valve driver (10) to switch the valve unit (30) from fill state to a drain state； and is. operation of the pump driver (20) to further displace the piston (302) in the forward direction in a series of gradual steps over an extended period of time.é descrito um aparelho de infusão de ambulatório, que inclui uma unidade condutora de bomba (2), uma unidade condutora de válvula (1) e uma unidade de controle (40). a unidade condutora de bomba (2) inclui um acionador de bomba (20) e um condutor de bomba (21), em que o acionador de bomba (21) é projetado para acoplamento a um pistão (302) de uma unidade de bomba de medição (30) para transmitir força de condução de bomba e/ou força de torção de condução de bomba do acionador de bomba (20) para o pistão (302). a unidade condutora de válvula (1
