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Hydraulic Piston Sealing Elements

  1. Hallite 730 PISTON SEAL Double-Acting
    26
    May

    Hallite 730 PISTON SEAL Double-Acting

    The Hallite 730 double-acting piston seal in a four part assembly is designed for use in heavy-duty applications where position holding ability is important, such as longwall mining roof support applications using water-based fluids and large diameter crane cylinders using standard hydraulic oils.

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  2. Hallite 51 Piston Seal
    26
    May

    Hallite 51 Piston Seal

    The Hallite 51 is a heavy duty piston seal which, when installed in pairs, provides an excellent double acting piston design. It is particularly suitable for difficult operating conditions such as pressure surging, vibration or some misalignment.

    The seal is an assembly of three parts, a male adaptor, a V ring and a female adaptor. Both the V ring and female adaptor are made from rubberised fabric which has a durability and strength, it also retains lubricant at the sliding surfaces so friction and wear are kept to a minimum. The V ring being the primar seal is more flexible than the adaptor whic supports it and prevents extrusion damage. At higher pressures the adaptor deforms and becomes a secondary seal.

    The polyacetal male adaptor has grooves across the face to ensure pressure is evenly applied to the V ring.

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  3. Hallite 65 Double Acting Seal
    25
    May

    Hallite 65 Double Acting Seal

    Ideal for light duty one piece piston applications, the Hallite 65 double acting seal is a simple, effective and economical design for pressures up to 160 bar/2500 p.s.i. its compact dimensions enable the designer to keep the length of the piston to a minimum. It is an assembly of a continuous rubber seal and two scarf cut bearings. The nitrile rubber seal is designed to be pre-loaded by the housing to ensure an effective seal at low pressure. The outward thrust of the rubber seal on the bearings as it reacts to increasing pressure prevents any extrusion damage in the sealing area. The polyacetal bearings are proportioned to support the piston and its side load.

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  4. Hallite 753
    25
    May

    Hallite 753

    Design
    The Hallite 753 is a compact assembly designed and developed specifically for one piece pistons.The assembly comprises a wear-resistant polyurethane slip ring which is loaded by an NBR ring. There are split 'L'shaped anti-extrusion bearings made from polyacetal resin on both sides of the seal.The proportions of the range have been determined to give a satisfactory performance when used with the recommended operating conditions.Hallite 753 is manufactured using two different profiles as illustrated below. The parts list clearly indicates which profile is used for each size.

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  5. Hallite 58 Double Acting Piston Seal
    25
    May

    Hallite 58 Double Acting Piston Seal

    The Hallite 58 double acting piston seal combines the Hallite 56 seal with bearing rings to give a very robust heavy duty seal assembly for split pistons. It enables the designer to use large clearances and, with the integral bearing rings, to restrict the piston length.

    The assembly comprises a seal and two L shaped bearings. The centre of the seal is rubber which is bonded to two ‘U’ section bases of rubberised fabric, and is compressed by the housing to obtain an effective low pressure seal. When the pressure increases the rubber energises the ‘U’ section and deforms it to the housing, increasingthe sealing area and improving the seal.

    Rubberised fabric is used to protect the rubber, because it has strength and durability which combines with its ability to retain lubricant to help keep friction low and reduce wear.

    Supporting the seal at either end is a polyacetal bearing proportioned to react to the pressure on the seal to prevent extrusion damage, and support the piston in its side load.

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  6. Hallite 755 Double-Acting Piston Seal
    25
    May

    Hallite 755 Double-Acting Piston Seal

    DESIGN
    The Hallite 755 double-acting piston seal is a compact, low friction seal for light to medium duty applications designed originally to fit North American NFPA groove standards. The Hallite 755 is comprised of a tough, wear-resistant thermoplastic elastomer face seal which is pre-loaded by a square cross-section NBR expander. The face material comes in a number of material options to extend operating conditions. The housing width allows a narrow width piston to be used. We  ecommend that an adequate bearing, such as the Hallite 506 or 87 bearing strip or the Hallite 533 molded bearing, is mounted on one or both sides of the seal. For further details of bearing grooves, please refer to the appropriate product data sheet

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  7. Hallite 606 PISTON SEAL
    25
    May

    Hallite 606 PISTON SEAL

    DESIGN
    The Hallite 606 single-acting, single lip asymmetric piston seal is designed with precision trimmed sealing lips to provide effective bore sealing in light and medium-duty applications. The seal can be considered for use in heavy-duty applications when used with a suitable full depth back-up ring. The sealing lips are trimmed at an angle to give optimal rod sealing performance. The range covers most standard housings used in Europe, North America and Asia. The Hallite 606 is designed to have an interference in the seal housing groove. The outer dynamic lip is shorter and more robust to improve sealing and compression set characteristics over conventional, symmetrical U-rings. The seal is recommended for use in single-acting piston seal applications. It can also be fitted back-to-back in separate grooves for use in double-acting applications. The Hallite 606 is moulded in Hythane® 181, Hallite’s high-performance polyurethane, for easy installation and excellent low temperature performance

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  8. Hallite 53 Double Acting Piston Seal (DAS)
    21
    May

    Hallite 53 Double Acting Piston Seal (DAS)

    A robust assembly designed specifically for one piece pistons, the Hallite 53 double acting seal uses a rubber sealing element which has proved itself in service to be extremely wear resistant and capable of working most effectively in a wide variety of medium duty applications. The seal is also suitable for two piece pistons.

    The assembly comprises a rubber seal, two split support rings and two split bearings, one of each located either side of the seal.

    The nitrile rubber seal is designed to have its section compressed by the housing, to ensure a low pressure seal and , when pressurised, be protected from extrusion damage by the extending lips of the support ring. The support ring is manufactured from a tough flexible polymer and scarf cut for assembly.

    The proportions of the range have been determined to give a satisfactory performance when used with the recommended operating conditions.

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  9. Hallite 754  PISTON SEAL Double-Acting Polyester Face with Pre-Loaded O-Ring
    19
    May

    Hallite 754 PISTON SEAL Double-Acting Polyester Face with Pre-Loaded O-Ring

    The Hallite 754 double-acting piston seal is a compact, low friction seal for light to medium duty applications. The Hallite 754 is comprised of a tough, wear-resistant thermoplastic elastomer face seal which is pre-loaded by a NBR O-ring. The face material comes in a number of material options to extend operating conditions. The housing width allows a narrow width piston to be used. We recommend that an adequate bearing, such as the Hallite 506 or 87 bearing strip, is mounted on one or both sides of the seal. For further details of bearing grooves, please refer to the appropriate product data sheet.

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  10. Hallite 780 Double Acting Piston Seals
    07
    May

    Hallite 780 Double Acting Piston Seals

    The Hallite 780 double-acting piston seal in a robust five part assembly is designed specifically for one piece pistons in a wide range of medium duty applications. The seal is also suitable for two piece pistons.

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