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SFK WIPER SEALS

SKF SLC produces over 30 million seals each year in close to 50,000 part numbers.

Hydraulic cylinders operate in a variety of applications and environmental conditions, including exposure to dust, debris or outside weather conditions. To prevent these contaminants from entering the cylinder assembly and hydraulic system, wiper seals (also known as scrapers, excluders or dust seals) are fitted on the external side of the cylinder head.

Wiper seals maintain sealing contact to the piston rod when the equipment is stationary (static, no reciprocating motion of rod) and in use (dynamic, reciprocating rod), whereas the tolerance for the rod diameter d is determined by the rod seal. Without a wiper seal, the retracting piston rod could transport contaminants into the cylinder. The outside static sealing of the wiper seal within the housing is also important to avoid moisture or particles from entering around the outside of the wiper seal.

SKF PRESS-IN WIPER PROFILES

Product

Profile

Description

Datasheet

PA

Polyurethane press-in wiper seal; steel retaining ring; single-lip design; lip protrudes from head; small radial cross section

MCW

Polyurethane press-in wiper seal; steel retaining ring; effective single lip design that sits flush with head; suitable for heavy duty applications

PAD

Polyurethane press-in wiper seal; steel retaining ring; double-lip design improves rod sealing system performance

PADV

PAD design with a vent hole in the inside-facing lip

SKF PRESS-IN WIPER PROFILES

Product

Profile

Description

Datasheet

DTW

Polyurethane snap-in wiper seal; singlelip design; static seal lips on the outside surface and outside face; notches on inside edge of heel

DX

This D series wiper is similar to the DS series wiper, but has the added dust lips to prevent contamination for entering the system from the static side.

HW

Polyurethane snap-in wiper seal; double- lip design improves rod sealing system performance

STD Seal

STD rod seal profiles can also be used as snap-in wiper seals. STD profiles are made of LUBRITHANE (TPU). They are suitable for pressures up to 400 bar (5 800 psi) in medium duty applications and can also be used as a heavy duty static seal or a snap-in wiper seal. These profiles are available in inch sizes where narrower seal housings are used.