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Parker Packing Division (EPS
Division)
The U-Cup (U-Packing or U-Ring) is the most compact and versatile of the many
lip type seals available. In its several configurations, it may be
utilized as an ID - Rod Seal, or an OD - Piston Seal.
The U-cup with long thin lips has very low dynamic friction and can accommodate
out-of-round or eccentric components. Other configurations with short
heavy lips provide a more reliable seal at low pressures and are better suited
for sealing at high pressures. These variations in design, coupled with
the broad range of available Parker materials results in a a very versatile line
of sealing devices.
Parker Packing produces a full line of U-Cups ranging from standard AN geometry
to the Parker BT U-Cup, a third-generation product with superior qualities.
Many U-Cups allow seepage, Parker's BT U-Cup however, includes a buffer ring,
which keeps the primary seal dry through even the most stringent service. The
unique BT U-Cup is made from Parker 4300, a new, low compression set
polyurethane material which meets the requirements of most Original Equipment
Manufacturer's specifications.
PolyPaks are patented, precision-molded, multi-purpose sealing devices combining
an O-Ring type O-Spring with a conventional lip seal. This produces a unique
product which seals in vacuum, high or low pressure.
The PolyPak design offers many unique advantages including superior sealability
-- providing an excellent seal from hard vacuum to more than 60,000 psi*. The
PolyPak won't leak under low pressure like many conventional U-Packing seals and
maintains lip loading on the I.D. and O.D. interface during temperature
extremes.
When combined with one of Parker's high performance urethanes or other sealing
materials, the PolyPak is an unbeatable combination of unique design geometry
and seal material capable of solving almost any hydraulic sealing problem.
Parker Rod Wipers are available in many styles and
compounds. The primary lip of a typical rod wiper provides a gentle but
effective wiping action during each stroke of the cylinder rod to remove foreign
material such as dust and grime from the exposed metal while still maintaining
an adequate lubricating film on the rod to prevent excess wear on the primary
seal. It protects the rod from scoring and the primary seal from damage.
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