Wipers of the series AS, AD and ADD serve to protect the downstream sealing system.  They prevent contaminants and foreign particles, which adhere to the piston rod, from coming into contact with the sealing system as the rod is retracted.

The wipers are essentially installed together with an O-ring as the preload element.  The elasticity of the O-ring ensures effective contact of the wiper lips with the mating surface while compensating for any deflection in the piston rod.

The type AS constitutes the classic design.  The wiping function is ensured by its profiled contour and the unilaterally extending wiper lip. 

The types AD and ADD are double wipers that serve to remove contamination from the retracting piston rod while also retaining any residual fluid film on the medium side so as to prevent entrainment by the extending piston rod.  This variant is used in conjunction with PTFE rod seals with hydrodynamic flow-back.  The profile shape of the type ADD is designed for heavy-duty applications in, for example, construction machinery, presses etc. 

The broad spectrum of material combinations available for the wiping element and selection of the appropriate material for the preload element ensure almost unlimited suitability in a wide range of different applications.

Advantages

• Outstanding sliding properties
• No stick-slip effect, even at low velocities
• High wear resistance, long service life
• Very good thermal and chemical resistance
• Effective compensation of rod deflection
• Very good wiping efficiency

Application ranges