Accumulator

An accumulator, comprising:

• a main cylindrical housing having a closed first axial end and a second axial end;
• a piston arranged in the main cylindrical housing and sealed to an inner surface of the main cylindrical housing, which piston is movable in an axial direction and provides with the main cylindrical housing and the closed first axial end of the main cylindrical housing a variable accumulating space;
• an urging device arranged between the piston and the second axial end of the main cylindrical housing configured to urge the piston towards the first axial end of the main cylindrical housing;
• a fluid supply opening arranged in the first axial end of the main cylindrical housing, which fluid supply opening is in fluid connection with the variable accumulating space;
• a protective cylindrical housing having a first and a second axial end, the protective cylindrical housing being arranged concentrically with and spaced apart from the main cylindrical housing, the protective cylindrical housing being arranged with its first axial end to the first axial end of the main cylindrical housing, and the second axial end of the protective cylindrical housing being closed and spaced apart from the second axial end of the main cylindrical housing, wherein a hole is arranged in the protective cylindrical housing;
• and
• a one way valve arranged in the hole.