Wipers

Wipers

Wipers are installed in the sealing configurations of hydraulic cylinders to prevent contaminants such as dirt, dust and moisture from entering the cylinder as they retract back into the system.

Contamination can cause significant damage to the rod, cylinder wall, seals, and other components, and is one of the primary causes of premature seal and component failure in a fluid power system.

Hallite offer a wide range of hydraulic wipers in High Performance Hallite® 361 polyurethane, Nitrile®, Hythane® 181 and other polyester based materials, along with press-fit metal caged ranges.

The wiper seal is the most undervalued seal type in the hydraulic cylinder in relation to its important function. Particular attention should be drawn to its selection, the surrounding environment and service conditions must also be taken into special consideration.

Wipers

  • 33 33 Max pressure
    Temp range -30°C to 100°C
    Max speed 4m/sec
    33
    33 Temp range -30°C 100°C Max speed 4m/sec

    The Hallite 33 wiper has a lip designed to remove lightly adhered dirt from the rod i.e. mud, dust or moisture.

    The wiper is manufactured from a hard nitrile rubber suitable for installing in a grooved housing. Rod diameters (d1) of 20mm and below require a two piece housing.

    To prevent dirt passing the outside of the wiper and to reduce the pumping action, the outside diamter is an interference fit with the housing. Certain sizes of the standard Hallite 33 metric range are suitable for ISO6195 Housing Type A.

    It should be noted that the Hallite 33 inch profile differs from the metric profile. Many of the metric sizes are also available as polyester wipers - see Hallite 38.

  • 38 38 Max pressure
    Temp range -40°C to 120°C
    Max speed 4m/sec
    38
    38 Temp range -40°C 120°C Max speed 4m/sec

    The Hallite 38 wiper has been designed so that the proportions of the wiping lip ensure it maintains contact with the rod surface to remove heavily deposited mud, ice etc. The outside diamter contacts the housing and has a seealing lip to prevent moisture entering the groove.

    A polyester based material is used to provide a tough abrasion reistant wiper for the difficult conditions usually found in mining or earth moving applications. All the range can be used with a split housing, however, the majority can be installed in a blind housing with care.

  • 335 335 Max pressure
    Temp range -30°C to 100°C
    Max speed 5m/sec
    335
    335 Temp range -30°C 100°C Max speed 5m/sec

    The Hallite 335 is an O-ring energised double lip wiper, which is designed to exclude dirt from entering the cylinder and to collect traces of fluid passing the rod seal. The standard design is made from bronze filled PTFE, activated by an NBR O-ring.

    A number of other material options can be provided to extend operating conditions . Please ensure that the correct part number is specified for the material option as indicated. The housing sizes listed meet ISO6195D.

    NB:  A vent between the seal and wiper is recommended to avoid a pressure trap.

  • 831 831 Max pressure
    Temp range -45°C to 110°C
    Max speed 4m/sec
    831
    831 Temp range -45°C 110°C Max speed 4m/sec

    The Hallite 831 wiper is designed to snap into a standard housing and provide reliable medium duty dirt exclusion. The proportions of the precision trimmed wiping lip ensure that it remains in contact with the rod surface to remove all deposits of mud and other forms of contamination except for those found in heavy duty industrial applications.

    The outside diameter of the seal incorporates a 'crush lip' to provide interference fit with the housing and a 'face bead' to ensure that the crush lip os not trapped in the corner of the housing. The inside diameter of the seal is provided with ribs to prevent the possibility of blow-out due to pressure trapping of the main rod seal.

    The Hallite 831 is precision moulded in polyurethane for maximum wear resistance and is interchangeable with many common European wiper styles.

  • 834 834 Max pressure
    Temp range -45°C to 110°C
    Max speed 4m/sec
    834
    834 Temp range -45°C 110°C Max speed 4m/sec

    The Hallite 834 wiper is designed to snap into a standard housing and provide reliable medium duty dirt exclusion. The proportions of the wiping lip ensure that it remains in contact with the rod surface to remove all deposits of mud and other forms of contamination except those found in teh heavy duty environment such as steel works and cement factories.

    The inside diameter of the seal is provided with ribs to prevent the possibility of blow out due to pressure trapping of the main rod seal.

    The Hallite 834 is precision moulded in Hythane® 181 for maximum wear resistance.

  • 839 839 Max pressure
    Temp range -45°C to 110°C
    Max speed 4m/sec
    839
    839 Temp range -45°C 110°C Max speed 4m/sec

    The Hallite 839 wiper is precision moulded in Hallite's high performance polyurethane - Hythane® 181 for maximum wear resistance, and is designed to exclude dirt and moisture from entering the cylinder and to collect traces of fluid passing the rod seal.

    Opposite the wiper lip are two sealing lips accurately produced and proportioned to collect fluid passing the rod seal. To obtain stability and improve the seal the outside diameter is in interference with the housing.

    The Hallite 839N wiper is designed to suit popular Asian housing and has a textured wiping lip for improved performance. A vent between the seal and the wiper is recommended to avoid a presure trap.

  • 839N 839N Max pressure
    Temp range -45°C to 110°C
    Max speed 4m/sec
    839N
    839N Temp range -45°C 110°C Max speed 4m/sec

    The Hallite 839 wiper is precision moulded in Hallite's high performance polyurethane - Hythane® 181 for maximum wear resistance, and is designed to exclude dirt and moisture from entering the cylinder and to collect traces of fluid passing the rod seal.

    Opposite the wiper lip are two sealing lips accurately produced and proportioned to collect fluid passing the rod seal. To obtain stability and improve the seal the outside diameter is in interference with the housing.

    The Hallite 839N wiper is designed to suit popular Asian housing and has a textured wiping lip for improved performance. A vent between the seal and the wiper is recommended to avoid a presure trap.

  • 842 842 Max pressure
    Temp range -45°C to 110°C
    Max speed 4m/sec
    842
    842 Temp range -45°C 110°C Max speed 4m/sec

    The Hallite 842 rod wiper is designed to prevent the ingress of foreign particles and moisture into the cylinder. The profile has been specially developed for harsh environments, in particular the longall mining industry.

    The special feature is the flap on the wiping lip which covers the gland housing, preventing the water/slurry trap so common with conventional wipers and thus ingress of contamination around the outside of the wiper. The internal ribs on the inside diamter prevent the possibility of pressure trapping between the gland seal and the wiper and ensure correct support and guidance of the wiping lip, even in cases of high eccentricity as can occur between the outer stage gland and the inner cylinder of a roof support leg.

    The Hallite 842 is manufactured in Hallite's high performance polyurethane Hythane® 181. The material has excellent compression set characteristics, excellent wear and abrasive resistance, proven compatability with HFA (95/5) fluids, as used in longwall mining equipment, and with mineral oil.

    A number of sizes, indicated by *, do not have an interference fit between the outside diameter of the wiper and the wiper housing bore ØD1. They float on the retaining lip.

  • 844 844 Max pressure
    Temp range -45°C to 110°C
    Max speed 4m/sec
    844
    844 Temp range -45°C 110°C Max speed 4m/sec

    The Hallite 844 wiper has been specifically developed for cylinders used in demanding off-highway applications. It is a double lip wiper designed for use with venting U-rings such as the Hallite 663 rod seal. The special feature is the flap on the wiping lip which covers the gland housing, preventing the water/slurry trap so common with conventional wipers and thus ingress of contamination around the outside of the wiper. The design minimises the oil transfer out of the ram on the cylinder rod and prevents dirt contamination and moisture entering the cylinder though the rod gland. The design is also particularly tolerant to rod deflection.

    The standard range is made from the high-performance Hallite 361 polyurethane. The wiper is also available in other Hallite polyurethane grades, if required.

  • 846 846 Max pressure
    Temp range -45°C to 110°C
    Max speed 4m/sec
    846
    846 Temp range -45°C 110°C Max speed 4m/sec

    The Hallite 846 wiper is designed to exclude dirt and moisture from entering the cylinder and to collect traces of fluid passing the rod seal.

    One special feature of the wiper design are the thin membranes which burst when excessive fluid pressure is trapped between teh wiper and the rod seal and prevent the wiper being forced out of its housing. After release of this pressure, the membranes close to protect against contamination from the outside. This feature removes the requirement for an expensive vent hole in the gland.

    A second feature is the sealing flap on the wiping lip that completely seals the metal housing groove, preventing the ingress of dirt and moisture around the outside diameter of the wiper.

    Precision moulded in Hallite's high performance polyurethane, Hythane® 181, for maximum wear resistance and temperature range, the wiper is designed to remove lightly adhered dirt, dust and moisture from the rod.

  • 860 860 Max pressure
    Temp range -40°C to 100°C
    Max speed 1m/sec
    860
    860 Temp range -40°C 100°C Max speed 1m/sec

    The Hallite 860 is a metal cased wiper, designed to press-fit into open groove housings. Hallite's 860 wiper comprises a precisely trimmed polyurethane wiping element which is securely bonded to a metal case treated with rust inhibitor. Capable of operating in dirty conditions, the proportions of the polyurethane wiping lip allow it to follow the side movement of the rod and to clear away heavily deposited dirt.

    Suitable for light, medium and heavy duty applicaions, the wiper has been designed to provide ease of installation and offers excellent durability in service. The Hallite 860 offers a range of sizes suitable for ISO 6195 type B housings and a range for standard Asian housings.

  • 864 864 Max pressure
    Temp range -45°C to 110°C
    Max speed 1m/sec
    864
    864 Temp range -45°C 110°C Max speed 1m/sec

    The Hallite 864 is a double lipped metal cased wiper, designed to press-fit into open groove housings. Hallite's 864 wiper comprises a specially textured polyurethane wiping lip which is securely bonded to a nitrided metal case, eliminating the potential for rust. Opposite the wiping lip are two sealing lips accurately produced and proportioned to collect the fluid passing through the rod seal. Capable of operating on dirty conditions, the proportions of the polyurethane wiping lip allow it to follow the side movement of the rod to clear away heavily deposited dirt. The Hallite 864 wiper is designed for use with venting U-rings such as teh Hallite 663 rod seal.

    Suitable for light, medium and heavy duty applications, the wiper has been designed to provide ease of installation and offers excellent durability in service.