Shock absorber for vehicles

A shock absorber aranged to damp relative movement between moving parts of vehicles, wherein ends of the shock absorber are connected to fixing devices attached to the moving parts and further comprise:

• a main piston;
• and
• a piston rod arrangement arranged in a hydraulic damping medium filled internal volume separated by the main piston in a compression volume and an expansion volume, and surrounded by an arrangement comprising two concentric inner and outer tubes separated by a space, wherein the damped movement between the moving parts is settled by a valve arrangement comprising:
• first adjustment devices connected to the compression volume;
• and
• a second adjustment connected to the expansion volume,
• wherein a first pressurized volume is created in a volume in a pressure maintaining accumulator by a pressure-generating piston separating the fluid damping medium from a compressible medium,
• wherein the first pressurized volume is arranged in a part forming a damper head attached to the inner and outer tubes, and
• wherein the second adjustment further comprises:
• a first damping force generating valve and first non-return valve placed in a pipe between the compression volume and the first pressurized volume;
• and
• a second damping force generating valve and first non-return valve placed in a pipe between the expansion volume and the first pressurized volume.