Hydraulic device

A hydraulic device comprising a rotor and a port member including a high-pressure port and a low-pressure port, wherein an outer surface of the rotor faces an outer surface of the port member and is rotatable with respect to the port member in a rotational direction about an axis of rotation, wherein the rotor is provided with a plurality of cylinders located at angular distance from each other about the axis of rotation and cooperating pistons which are movable within the respective cylinders, wherein the cylinders communicate with respective open ends at the outer surface of the rotor wherein each of the open ends alternatingly communicates with the high-pressure port and the low-pressure port under operating conditions, wherein each two successive cylinders of the plurality of cylinders are interconnected via a fluid displacement member having a first opening that communicates with one of the two successive cylinders, a second opening that communicates with the other one of the two successive cylinders and a closure element that is freely movable between the first and second openings and configured such that the closure element substantially obstructs either the first opening or the second opening if under operating conditions the pressure in the cylinder that communicates with the second opening is higher or lower than the pressure in the cylinder that communicates with the first opening, respectively, wherein in the rotor at a distance from each open end a flow resistance is provided, wherein the first opening and the second opening of each two fluid displacement members which communicate with one cylinder are fluidly connected with that cylinder at opposite sides of the flow resistance.