Driv Inc.’s new family of highly tunable add-on valves for automotive original equipment manufacturers (OEMs) feature stroke-dependent dampening (SDD) valve technology to improve the performance of passive dampers.

Driv’s new Monroe RideRefine SDD valve works in concert with the main valve in a passive damper. Hydraulic fluid is fed to the add-on valve via a bypass from the main valve. The small valve suppresses vibrations and harshness with a small tunable stroke. The main valve takes over when limitations of the Monroe RideRefine SDD valve have been breached.

SSD acts as a filter for a passive damper. It eliminates vibrations and harshness introduced by uneven surfaces and minor road imperfections. Integration of the add-on valve is also facilitated by the design, as it is easily attached below the piston of the main valve.