Hallite
The Hallite 730 double-acting piston seal features a four part assembly.

Hallite 730 Double-Acting Piston Seal Benefits Heavy-Duty Applications

Jan. 27, 2023
The 730 piston seal is compatible with hydraulic oils and water-based fluids, enabling use in various applications.

The Hallite 730 double-acting piston seal features a four-part assembly and is designed for use in heavy-duty applications. It is beneficial for use in applications requiring position-holding capabilities.

Key features of the piston seal include:

  • face seal comprised of wear-resistant thermoplastic polyester elastomer (TPE)
  • suitable for maximum pressures of 700 Bar
  • compatible with various fluids including hydraulic oils and water-based fluids
  • contains a pair of rectangular polyacetal anti-extrusion rings.

Durable Design Aids Use in Harsh Applications

Use of a tough TPE material for the face seal ensures suitability for both roller-burnished and honed tubing. Alternate materials can be provided when needed such as lubricated polyester and PTFE. 

The face seal is also pre-loaded by a profiled nitrile rubber energiser, helping to provide further durability for piston sealing. A pair of rectangular polyacetal anti-extrusion rings are included on the 730 piston seal as well, again aiding durability and sealing capability. 

Benefiting the seal's use in various heavy-duty applications is its operating temperature range of -40 to 110 degrees C when used with hydraulic oils and 0 to 60 degrees C with water-based fluids. It also features a maximum speed of 0.3 m/sec.

Hallite first introduced the 730 in 1980 to bring new sealing technology for mining leg cylinders to the market. It included polyester face rings combined with NBR energizers like the current design, indicating the lasting applicability of these sealing technologies. The company specifies the 730 double-acting piston seal suits use for longwall mining roof support applications and large diameter crane cylinders, demonstrating its capabilities in these heavier duty, harsher applications.

About the Author

Sara Jensen | Executive Editor, Power & Motion

Sara Jensen is executive editor of Power & Motion, directing expanded coverage into the modern fluid power space, as well as mechatronic and smart technologies. She has over 15 years of publishing experience. Prior to Power & Motion she spent 11 years with a trade publication for engineers of heavy-duty equipment, the last 3 of which were as the editor and brand lead. Over the course of her time in the B2B industry, Sara has gained an extensive knowledge of various heavy-duty equipment industries — including construction, agriculture, mining and on-road trucks —along with the systems and market trends which impact them such as fluid power and electronic motion control technologies. 

You can follow Sara and Power & Motion via the following social media handles:

X (formerly Twitter): @TechnlgyEditor and @PowerMotionTech

LinkedIn: @SaraJensen and @Power&Motion

Facebook: @PowerMotionTech

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