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Hydraulic Sealing Products

Lion® Expanding - for rams, rods & glands

Description
Our Lion® Expanding packing set is highly proven on industry's most arduous applications. It has a sealing lip profile that is specially developed to withstand the massive side loads and high pressure peaks encountered on forging presses and other large metal-forming plant.

It provides efficient sealing on heavy-duty hydraulic systems and also gives 'bearing' support to the ram, which is particularly beneficial when the ram is horizontal. The 'bearing' role is a very successful feature that relies on the use of deep rings of robust construction to provide radial support to a large ram. 

Each Lion® Expanding set comprises a heavy-duty gland ring/female adapter, two or more intermediate rings, and a header ring. All sealing rings have double lips. A V-shape base on the intermediate rings ensures that the packing responds automatically to system pressure and gives wedging action under gland compression - which helps to keep equipment in service even with worn bushes or rams.

The sealing rings are moulded with an interference fit on the lips to give effective sealing at low pressure, which is augmented when system pressure is applied. The gland ring has a heavily reinforced base to resist extrusion; and individual rings are of very robust proportions to resist distortion under heavy side loads and high-pressure peaks.

Special features

  • Robust multi-lip packing that withstands heavy side loads and pressure peaks.
  • Available in split form for major downtime savings.
  • Tolerates the most aggressive working conditions to maintain plant efficiency.
  • Extrusion-resistant materials prevent seal damage in housing clearances. 
  • Available with Self-aligning Gland Ring.

Typical applications
A traditional heavy-duty ram seal for forging presses where high side loads and pressure peaks are encountered. Also for horizontal extrusion presses where the sealing rings will help to provide radial support..

Operating capabilities

  • Maximum operating pressure: 62MPa (8992psi).
  • Temperature range (standard materials): -20°C to +100°C (-4°F to +212°F).  
  • Maximum surface speed: 0.5m/s (98.4fpm). For higher speeds please consult our Technical Support Team.  

Materials of construction
Gland ring/female adapter
Standard material:
heavy-duty cotton fabric proofed with medium nitrile (NBR) rubber. 
Special materials: heavy-duty synthetic fabric proofed with hydrogenated nitrile (HNBR), butyl (IIR), or fluorocarbon (FKM) rubber.

Intermediate rings
Standard & Special materials:
as for gland ring.

Header ring
Standard materials:
Type 1 - nitrile/styrene-butadiene blend of 100 IRHD; Type 2 -  moulded or machined nylon; Type 3 - extruded nitrile of 85-95 IRHD.
Special materials: acetal; glass-loaded PTFE; or nylon.

Media capabilities
Standard materials are suitable for use with most mineral based hydraulic fluids, and most fire-resistant fluids of the water/oil emulsion or water/glycol types at temperatures up to 100°C (212°F). Also resistant to air, water, and most lubricating oils and greases.

Special materials considerably extend the range of applications in terms of temperature, fluid compatibility and abrasion resistance. Please ask our Technical Support Team for further information.

How supplied
Split packing sets to suit standard housing sections are available without tooling charges for ram diameters of 300mm to 1875mm, and 12 inch to 74 inch. We also have a substantial library of mould tools for split and endless sets. Other sizes manufactured to order, but tooling charges may be incurred. Fitting instructions are supplied with every set.

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