Medical apparatus for delivering fluid to a patient, comprising: a reservoir for a fluid; a first pump comprising first and second pump ports (14,15); and a valve assembly comprising first, second and third valve ports (28,29,30); wherein: the first valve port is in fluid communication with the reservoir; the second valve port is in fluid communication with the first pump port; the third valve port is an outlet for delivering fluid to a patient; the second pump port is in fluid communication with the reservoir; and characterized in that the first pump is reversible such that: in a recirculation mode, the valve assembly is configured to permit fluid flow from the first valve port to the second valve port but not to the third valve port, the pump being operated in one direction to draw fluid from the reservoir through the valve assembly to the first pump port and to recirculate the fluid from the second pump port to the reservoir; and in a fluid delivery mode, the valve assembly is configured to permit fluid flow from the second valve port to the third valve port but not to the first valve port, the pump being operated in an opposite direction to draw fluid from the reservoir to the second pump port and to deliver the fluid from the first pump port through the valve assembly to the third valve port. a reservoir for a fluid; a first pump comprising first and second pump ports (14,15); and a valve assembly comprising first, second and third valve ports (28,29,30); wherein: the first valve port is in fluid communication with the reservoir; the second valve port is in fluid communication with the first pump port; the third valve port is an outlet for delivering fluid to a patient; the second pump port is in fluid communication with the reservoir; and characterized in that the first pump is reversible such that: in a recirculation mode, the valve assembly is configured to permit fluid flow from the first valve port to the second valve port but not to the third valve port, the pump being operated in one direction to draw fluid from the reservoir through the valve assembly to the first pump port and to recirculate the fluid from the second pump port to the reservoir; and in a fluid delivery mode, the valve assembly is configured to permit fluid flow from the second valve port to the third valve port but not to the first valve port, the pump being operated in an opposite direction to draw fluid from the reservoir to the second pump port and to deliver the fluid from the first pump port through the valve assembly to the third valve port. the first valve port is in fluid communication with the reservoir; the second valve port is in fluid communication with the first pump port; the third valve port is an outlet for delivering fluid to a patient; the second pump port is in fluid communication with the reservoir; and characterized in that the first pump is reversible such that: in a recirculation mode, the valve assembly is configured to permit fluid flow from the first valve port to the second valve port but not to the third valve port, the pump being operated in one direction to draw fluid from the reservoir through the valve assembly to the first pump port and to recirculate the fluid from the second pump port to the reservoir; and in a fluid delivery mode, the valve assembly is configured to permit fluid flow from the second valve port to the third valve port but not to the first valve port, the pump being operated in an opposite direction to draw fluid from the reservoir to the second pump port and to deliver the fluid from the first pump port through the valve assembly to the third valve port. in a recirculation mode, the valve assembly is configured to permit fluid flow from the first valve port to the second valve port but not to the third valve port, the pump being operated in one direction to draw fluid from the reservoir through the valve assembly to the first pump port and to recirculate the fluid from the second pump port to the reservoir; and in a fluid delivery mode, the valve assembly is configured to permit fluid flow from the second valve port to the third valve port but not to the first valve port, the pump being operated in an opposite direction to draw fluid from the reservoir to the second pump port and to deliver the fluid from the first pump port through the valve assembly to the third valve port.