Dual-tube shock absorbers have two tubes. The working cylinder is located in the inner tube and is divided into two chambers by the working piston. The oil displaced by the piston rod fills an equalizing chamber between the inner and outer tubes. This equalizing chamber is connected to the working cylinder by the foot valve. The damping valves are normally located on the working piston for the extension stage and in the foot valve for the compression stage. A low-pressure gas area above the oil column in the equalization chamber ensures correct operation of the damper even at high temperatures.

 

Advantages:

• Short overall length

• Low friction

• Outer tube can also accommodate attachments (spring plate, stabilizer brackets, …)

• Particularly suitable for McPherson spring strut