Hydraulic wiper, metric, soft, intelligent, polyurethane, T846, 25 x 33 x 4-8.7 mm, Hallite.

The 846 type double-lipped, snap-in rod wiper is developed specifically for cylinders applications on mechanical handling equipment, particularly those with long stroke, and designed for use with venting U-rings. The design minimises the oil transfer out of the ram on the cylinder rod by collecting traces of fluid passing the rod seal. The unique feature of the 846 is the Umbrella Wiper Technology, which is a protective debris guard flap on the wiping lip that entirely covers the gland housing and prevents the water/slurry trap that is common with conventional wipers. This feature offers added protection to the integrity of the hydraulic system by reducing corrosion and preventing the ingress of contamination into the wiper housing groove and hydraulic cylinder gland which will result in increased system life. Another special feature of the 846 wiper design is the thin membranes which burst when excessive fluid pressure is trapped between the wiper and the rod seal. This prevents pressure from ejecting the wiper out of its housing. After release of this pressure, the membranes close to protect against contamination from the outside without the need for an expensive vent hole in the gland. The 846 is moulded in Hythane 181, Hallite's high-performance polyurethane, for easy installation and excellent low temperature performance and has a textured wiping lip to provide improved dry rod performance, particularly for long stroking cylinder applications.