Wiper rings, i.e. rubber or other synthetic seals that are fitted around a moving shaft to form a low-pressure seal. Contamination particles in the hydraulic system is the most common reason for breakdowns and short service life of seals. The choice of wiper rings should, however, be founded on as carefully drawn-up requirement specifications as the choice of piston and rod seals. The surrounding environment and service conditions must be taken into special consideration.
