BACK-UP RINGS

BACK-UP rings prevent the extrusion and the damaging of the O-Rings due to high pressures and clearance.

 TYPES AVAILABLE

A  For heavy duty use.
For high and frequent pressure peaks and large clearance.
B For medium to high pressures and for frequent pressure peaks.
C For use in medium to less-demanding operational conditions.
D
Gap Recovering

HOUSING FOR O-Rings AS 568 - ISO 3601/1

Back-Ups are dimensioned according to the groove
Choose the largest groove housing widths  G  to go with greatest clearance and pressures.
OR
SECTION
GROOVE DEPTH
H
GROOVE WIDTH
G
STATIC SEAL DINAMIC SEAL
no backup
1 backup ring
2 backup ring
1.78
1.25 - 1.35
1.40 - 1.45
2.4 - 2.6
3.5 - 4.0
5.2 - 6.0
2.62
2.05 - 2.15
2.25 - 2.30
3.6 - 3.8
4.4 - 5.0
6.1 - 7.0
3.53
2.80 - 2.95
3.05 - 3.10
4.8 - 5.0
5.3 - 6.0
7.0 - 8.0
5.33
4.30 - 4.50
4.62 - 4.75
7.2 - 7.4
7.9 - 8.5
10.4 - 11.2
6.99
5.75 - 5.95
6.00 - 6.10
9.6 - 9.8
10.4 - 11.5
13.7 - 15.0

 
 
 

HOUSING FOR O-Rings metric series

Back-Ups are dimensioned according to the groove
Choose the largest groove housing widths  G  to go with greatest clearance and pressures.
OR
SECTION
GROOVE DEPTH
H
GROOVE WIDTH
G
STATIC SEAL DINAMIC SEAL
no backup
 1 backup ring
2 backup ring
1.0
0.65 - 0.70
0.75 - 0.80
1.4 - 1.6
2.4 - 2.6
3.4 - 3.6
1.5
1.15 - 1.25
1.30 - 1.35
2.0 - 2.2
3.1 - 3.6
4.2 - 5.0
2.0
1.55 - 1.70
1.80 - 1.90
2.7 - 2.9
3.6 - 4.1
4.8 - 5.6
2.5
2.00 - 2.20
2.20 - 2.35
3.4 - 3.6
4.2 - 4.7
5.4 - 6.2
3.0
2.40 - 2.55
2.70 - 2.80
4.2 - 4.4
5.6 - 6.0
7.5 - 8.2
4.0
3.20 - 3.40
3.60 - 3.70
5.4 - 5.6
6.8 - 7.5
8.5 - 9.0
4.5
3.60 - 3.90
4.20 - 4.30
 6.1 - 6.3
7.5 - 8.0
9.2 - 10.2
5.0
4.00 - 4.30
4.50 - 4.65
6.8 - 7.0
8.0 - 8.5
9.5 - 10.5
5.5
4.40 - 4.70
5.00 - 5.10
 7.4 - 7.6
8.7 - 9.
10.2 - 11.0
6.0
4.70 - 5.20
5.40 - 5.55
 8.1 - 8.3
9.3 - 10.0
11.0 - 12.0
8.0
6.40 - 6.80
7.20 - 7.40
 10.8 - 11.0
11.8 - 12.5
13.5 - 14.5
10.0
8.00 - 8.50
9.00 - 9.30
 13.5 - 13.7
14.0 - 15.0
15.5 - 16.5
For other measurements please contact the technical office.


HOW TO ORDER

HD BACKUP |_A_|x|_B_|x|_C_| |_D_| |_E_| |_F_| |_N_| |_S_|

where:
A = Largest diameter
B = Smallest diameter
C = Groove width      G
D = Profyle      A  B  C
E = O-Ring cross section
F = Material (normally NEUFLON-007 grade)
N = 1 or 2 Backup
S = Split ring      Yes/No
EXAMPLE: 
  • Static seal shaft  diameter 55 
  • Groove diameter  59,2
  • Groove width 4,6 
  • O-Ring cross section 2,62 
  • Profile B 
  • N.1 Back-up in NEUFLON - 007
  • Split ring
HD BACKUP 55x59,2x4,6 B 2,62 - 007 - 1 yes

© Copyright  HD Slippers srl  1998 all rights reserved

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