HW wiper seals
HW seals are snap-in wiper seals with a double-lip design and an inner wiping lip that regulates the lubricating film on the rod. The inner lip wipes excess fluid film from the rod during the extension stroke and allows the excess fluid to return beneath the rod seal on the return stroke. Double-acting wipers therefore improve performance and extend the service life of rod sealing systems. SKF recommends using double-acting wiper seals in combination with a single-lip rod seal U-cup, such as the S1S profile, to ensure that pressurised fluid returns to the hydraulic system. These profiles are available in metric and inch sizes.