Patent ID: 7866333

Claim:
A fluid transfer system for transferring fluid from a reservoir ( 2 ) to a receiving device, the fluid transfer system comprising: a through flow device ( 6 ) adapted to receive fluid from the reservoir ( 2 ) and transfer fluid through the system and comprising a measuring unit adapted to measure the amount of fluid being transferred from the reservoir to the receiving device, a controllable shut-off valve ( 9 ) arranged upstream of the receiving device and downstream of the through flow device ( 6 ), a controlling unit controlling at least the state of the shut-off valve ( 9 ) wherein the controlling unit is adapted to control the state of the shut-off valve so that the delivered amount corresponds to a demand in such a way that the controlling comprises operating the shut-off valve in PWM-mode (pulse width modulation-mode), and wherein the controlling unit is adapted to determine the accumulated demand for a given interval, accumulate the delivery during at least part time of the interval by the measuring unit and adapt the width(s) of one or more pulses in said interval so that the accumulated delivery in said intervals equals the accumulated demand.