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Wiper seals

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 (fig. 1).

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.

Press-in wiper seals

ProfileDescription
PA

Polyurethane press-in wiper seal; steel retaining ring; single-lip design; lip protrudes from head; small radial cross section
Additional information
Profile data
Size list metric [pdf]
MCW

Polyurethane press-in wiper seal; steel retaining ring; effective single lip design that sits flush with head; suitable for heavy duty applications
Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]
PAD

Polyurethane press-in wiper seal; steel retaining ring; double-lip design improves rod sealing system performance
Additional information
Profile data
Size list metric [pdf]
PADV

PAD design with a vent hole in the inside-facing lip
Additional information
Profile data
Size list metric [pdf]

Snap-in wiper seals

ProfileDescription
DTW

Polyurethane snap-in wiper seal; singlelip design; static seal lips on the outside surface and outside face; notches on inside edge of heel
Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]
DX

Polyurethane snap-in wiper seal with nitrile rubber O-ring; single-lip design; patented profile for heavy duty applications; notches on inside edge of heel
Additional information
Profile data
Size list inch [pdf]
HW

Polyurethane snap-in wiper seal; double- lip design improves rod sealing system performance
Additional information
Profile data
Size list metric [pdf]
Size list inch [pdf]
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