Lion Expanding Packing
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Lion Expanding Packing , Traditional, robust multi-lip packing Description
This heavy-duty 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. A Lion Expanding Packing 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 aggressive working conditions
to maintain plant efficiency.
• Extrusion resistant materials prevent
seal damage in housing clearances.
• Available with Self-aligning Gland
Ring (see page 39).
Typical applications
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.
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 90 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 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 application in terms of
temperature, fluid compatibility and
abrasion resistance. Please ask our
Technical Support Team for further
information.
How supplied
(Also see Hydraulic sealing products —
Size charts, which can be downloaded
from www.jameswalker.biz)
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 have a substantial library of mould
tools for split and endless sets. Other
sizes are manufactured to order, but
tooling charges may be incurred.
Fitting instructions are supplied with
every seal.
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