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DESIOR TECHNOLOGY CO.,LTD has served as the leading rubber component manufacturer in China.
BACK UP RING
Back-up rings are manufactured from extrusion resistant material as protection and support elements, normally with a rectangular cross-section.
For static applications they are used together with an elastomer seal – usually an O-ring – placed in the groove.
Because there is a tight fit between back-up ring and bore hole or rod it prevents the O-ring from extruding into the sealing gap under pressure.
Gap extrusion destroys the O-ring
Back-up ring supports the O-ring
Back-up Rings Can Be Used In Static Applications As Well As In Translational Movements Or Slow Rotations
If the pressure is one-sided, it is sufficient to install the seal on the side opposite the pressure.
With pressurization on alternate sides, two back-up rings should be used, one back-up ring on each side of the O-ring.
O-Ring Installation Clearance Details And Recommendations
Pressure direction <->
Pressure direction ->
Pressure direction <->
Back-up ring SU
– Rectangular profile
– For static and back and forth movements or slow rotations
Back-up ring SG
– Rectangular profile, split
– As alternative to unsplit back-up rings if these cannot be installed or in case a split groove is not possible
– For static and back and forth movements
– Oblique cut at 30°or 45°angles, the back-up ring is cut chipless so that there will be no gap when installed.
Back-up ring SKG
– Concave profile, split
– Mainly for static applications, possible use in back and forth movements
– Protects the O-ring against extreme deformations during pulsating pressures due to the larger contact surface.
– The form stability of the O-ring has a favorable influence on leak tightness and service life
– As alternative to the unsplit SKU back-up rings if these cannot be installed or in case a split groove is not possible
Back-up ring SP
– Back-up ring, spiral form
– As alternative to unsplit back-up rings if these cannot be installed or in case a split groove is not possible
– For static and back and forth movements
– Oblique cut at 30° or 45° angles
– Application under large temperature fluctuations
– Large tolerance variations are compensated through spiral contraction and expansion
Back-up ring SUQ
– Special designs made of PTFE (snap-back, quenched)
– Easy installation in enclosed groove areas due to the recovery property of the PTFE material
– Because the dimensions deviate from standard designs, these back-up rings are manufactured only on request based on drawings
O-Ring Installation Groove Dimensions For Static Applications
|
cord strength |
droove depth |
w/o back-up ring |
1 back-ring |
2 back-ring |
recommended back-up ring width |
|
ø d |
t ± 0,05 |
b + 0,25 |
b1 + 0,25 |
b2 + 0,25 |
|
|
1,50 |
1,10 |
2,10 |
3,10 |
4,10 |
1,00 |
|
1,78 |
1,35 |
2,50 |
3,50 |
4,50 |
1,00 |
|
2,00 |
1,56 |
2,70 |
4,20 |
5,70 |
1,50 |
|
2,50 |
2,05 |
3,30 |
4,80 |
6,30 |
1,50 |
|
2,62 |
2,18 |
3,50 |
5,00 |
6,50 |
1,50 |
|
3,00 |
2,52 |
3,90 |
5,40 |
6,90 |
1,50 |
|
3,50 |
3,00 |
4,40 |
5,90 |
7,40 |
1,50 |
|
3,53 |
3,00 |
4,40 |
5,90 |
7,40 |
1,50 |
|
4,00 |
3,40 |
5,00 |
6,70 |
8,40 |
1,70 |
|
5,00 |
4,25 |
6,30 |
8,00 |
9,70 |
1,70 |
|
5,33 |
4,53 |
6,70 |
8,40 |
10,10 |
1,70 |
|
5,70 |
4,85 |
7,10 |
9,10 |
11,10 |
2,00 |
|
6,00 |
5,10 |
7,50 |
9,50 |
11,50 |
2,00 |
|
6,99 |
5,94 |
8,80 |
10,80 |
12,80 |
2,00 |
|
7,00 |
5,95 |
8,80 |
10,80 |
12,80 |
2,00 |
|
8,00 |
6,80 |
10,00 |
12,50 |
15,00 |
2,50 |
|
10,0 |
8,50 |
12,50 |
15,00 |
17,50 |
2,50 |
Further application information:
The risk of gap extrusion is typical under high pressures or with small ring cross sections in static but also dynamic applications.
A back-up ring must always be used together with an O-ring. The back-up ring itself provides no sealing.
Materials
| ● TFE pure (CCN-01), standard material | ● NBR/VITON 90SH | ● PU | |
| ● PTFE + bronze | ● PTFE + glass fiber | ● JPTFE + carbon | |
| ● POM, PA, PEEK &hellip |
Application limits
> depends on back-up ring material and sealing gap
Dynamic Applications
| ● Translational motions: approx. up to 40 MPa | ● Rotation: approx. up to 15 MPa | ● Operating temperature: -200℃ to +200℃ |
Static Applications
| ● Approx. up to 250 MPa working pressure | ● Speed: approx. up to 2m/s |
For More Information Or To Request A Quote On Back-up Rings, Please Contact Us
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