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Cone-shape Floating Seals

The Reason Series 329 Floating Seals are a special type of
mechanical seal. They are predominantly used in sealing bearings
for earth moving and construction equipment or in industry which
operates with extreme conditions and is subject to heavy wear, also
known as lifetime seals, duo cone seals, toric seals, mechanical
face seals and heavy duty seals. 


The two main common types of  Reason Floating Seals are 319 and 329 series:
  • 319A Floating Seal which uses a “O” Ring as the secondary sealing element.
  • 319B Floating Seal which uses a diamond shaped elastomer as the secondary
    sealing element.
  • 329 series is the high temperature series.
Both the 319A and 319B are made with of two identical metal seal rings with lapped seal
faces which seal against each other. Special designs, such as 329C and 329D as in the
picture above are available upon request. All Reason Floating Seals can also be divided by
the use of different materials .

Design Principle

Floating seals consist of two metal seal rings with lapped seal faces which are mounted in
two separate seal housings with the two lapped seal faces, face to face. The secondary
elastomer sealing elements centre the seal in the housings.

Method of Operation

The elastomer secondary sealing element has three functions:
  • Generating a uniform axial face load due to their elasticity.
  • Acting as a static seal on the inner and outer diameters.
  • Preventing the seal ring from turning with the shaft and transmitting torque from the
rotating half through the faces to the static half. Floating seals have a wedge shaped gap from the ID to the sealing faces allowing access to lubricate the sealing faces.   Lubrication is necessary at all times.    

Reason Floating Seal Materials

All Reason Floating Seals are made from forged steel rings:
Type Metal Sealing
Sealing Element
319 319A FM01 OJ01
(Shore 60A)
-20℃—80℃ 3.5 Kg/cm2
329 329A FM02 OJ02
(Shore 60A)
-40℃—190℃ 3.5 Kg/cm2
Advantages of Forging over Casting:
Forging Casting
*Forged by hammering and extrusion
*Plastometric set, refined grain and fibrous joint
*No porosity, compact, excellent toughness and
better mechanical performance
* Widely used in spare parts production, such as
axis, gears, etc.
*Cast by pouring liquid metal into a mould cavity
and cooling
*Non-plastometric set, poor fibrous joint
*Porosity often occurs during molding process,
poor compactness and toughness
*Widely used in spare parts with low mechanical
performance, such as equipment shell, etc.
Forged metal is strongly suggested where high temperatures or other severe operating
conditions exist. Forged oil seals in-place of cast oil seals, is an international trend in upgrading of
equipment. All of Reason 319 (329) series floating seals are forged.