1.
Backup Rings - PARKER 8-DASHS
Parker
Parbak® Contoured Continuous Back-up Rings
The Parker
Parbak is a supplement to a pressure seal such as an O-ring. It
is not a seal in itself.
The primary
reason for the use of a back-up ring is to reduce the clearance
gap on the low pressure side of an O-ring or similar type seal.
An O-ring and Parbak combination will withstand much higher pressures
than an O-ring alone.
Parker Seal's
Parbak back-up rings are outstanding for several reasons. To begin
with, Parbaks are molded of a hard rubber compound in one continuous
circle, yet they can be stretched easily into place. Because they
are not split or spiraled, Parbaks do not cause the localized
wear on O-rings characteristic of back-up rings of that type of
construction.
Parbaks have
proved to last longer with greater reliability than all other
types of back-up rings tested. They are lower in cost than competitive
products.
Parbaks extend
the operating pressure range of O-rings or other types of seals.
Some additional benefit such as increased lubrication of the O-ring
may also be obtained because the Parbak will trap small amounts
of lubricant between itself and the O-ring.
The use of
Parbaks permits a far greater metal-to-metal clearance between
moving parts. This helps overcome difficulties encountered with
wide or out-of-tolerance bores and shafts.
The elastic
nature of the O'ring seal and the clearance reducing capability
of the Parbak offers an important cost reduction opportunity.
In many applications, machining tolerances can be increased at
a considerable dollar savings.
Advantages:
- Easy to
assemble
- Cost reduction
item
- Shaped
for better performance
- Low in
price
- Increased
O-ring life
- Improved
lubrication
- Resist
higher pressures
- Uniform
materials and sizes
- Total Diametral
Clearance
- Parbak
Gland Design

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Custom | Leather
| Parker 8-Dashs | Rubber
| Teflon |
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