Patent ID: 8635939

Claim:
An apparatus comprising: a series of units, each being capable of producing a volume flow, a first channel for supplying hydraulic fluid into the apparatus, a second channel for supplying hydraulic fluid from the apparatus, a first series of valves comprising at least one controlled valve for each unit, by means of which valves the supply of volume flow from each unit to the second channel can be prevented and allowed, a third channel for supplying hydraulic fluid from the apparatus, several controlled auxiliary valves, each being provided for one unit and used for preventing and allowing the supply of volume flow from said unit to the third channel, and wherein each unit is capable of receiving hydraulic fluid from the second channel by means of the first series of valves and from the third channel by means of the auxiliary valves, wherein: chamber operating by the principle of displacement, the chamber being connected by means of a line to at least one valve of the first series of valves and to at least one auxiliary valve of the auxiliary valves, and wherein the chambers are controllable for synchronized operation for producing a desired total volume flow to the second channel and to the third channel.