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T18

T18

Product catalog summary

Design Overview: The Hallite 18 is a medium to heavy-duty single-acting seal known for its robustness and effectiveness across various applications. It features a rubberized fabric U-form base bonded to a rubber energizer. The seal is pre-loaded by the housing to ensure low-pressure sealing, with increased pressure enhancing the sealing area and efficiency. It is not recommended for back-to-back use in piston applications to form a double-acting assembly. The seal is best suited for split housings, although certain sizes can fit grooved gland housings with careful assembly.

Operating Conditions: The seal operates at a maximum speed of 0.5 m/sec (1.5 ft/sec) and within a temperature range of -30°C to +100°C (-22°F to +212°F). It can withstand a maximum pressure of 500 bar (7500 psi). The maximum permissible extrusion gap varies with pressure, from 0.4 mm at 160 bar to 0.1 mm at 500 bar.

Surface Roughness: The dynamic sealing face for both rod and piston should have a roughness of 0.1 to 0.4 µmRa, while the static sealing face should not exceed 1.6 µmRa. Static housing faces should have a maximum roughness of 3.2 µmRa.

Chamfers & Radii: Specifications for groove sections and chamfers are provided, with minimum chamfer sizes ranging from 2.0 mm to 10.0 mm and maximum fillet radii from 0.2 mm to 2.4 mm.

Tolerances: Tolerances for rod and piston diameters are specified, with rod tolerances at f9 and piston tolerances at js11, ensuring precise fitting and performance.

Features: The Hallite 18 is highlighted as the original Hallite fluid seal, suitable for general purposes and known for its long life.

Technical Details: Detailed metric and inch specifications are provided for various sizes, including tolerances and part numbers, ensuring compatibility and proper selection for specific applications.

Catalog excerpts

A medium to heavy duty single acting seal, the Hallite 18 has shown itself over many years to be an effective and robust seal in a wide variety of applications. Design The seal comprises a rubberised fabric U form base to which is bonded a rubber energiser. The seal section is pre-loaded by the housing when installed to ensure effective sealing at low pressure. When the pressure increases the rubber energises the U form to increase the sealing area and hence the efficiency of the seal. The strength and durability of the rubberised fabric combines with its ability to retain lubricant keeping friction and wear to a minimum. In a piston application the Hallite 18 should not be used back to back to make a double acting assembly. The range should be fitted to split housings as shown, but sizes marked* can be fitted to a grooved gland housing, if assembled with care. NB: Size lists give "on line" tolerances for rod applications. • The original Hallite fluid seal • General purpose seal • Long life Technical details Operating conditions Maximum Speed Maximum Pressure Figures show the maximum permissible gap all on one side, for rod seals using minimum rod Ø and maximum clearance Ø and for piston seals using the minimum clearance Ø and maximum bore Ø. Refer to Housing Design section. Temperature Range Surface roughness Static Sealing Face – Rod ØD1 Dynamic Sealing Face – Rod Ød1 Dynamic Sealing Face – Piston ØD1 Static Sealing Face – Piston Ød1 Static Housing Faces L1 Chamfers & Radii Groove Section ≤ S mm Min Chamfer C mm rod/piston seals

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