Datasheet

© Freudenberg Simrit GmbH & Co. KG | Technical Manual 2007562
Technical Principles | O-Rings and Static Seals
Pneumatics – axial movement –
without ISC O-Ring compression under
pressure (float-mounted fitting)
The float-mounted fitting is especially suitable for the
sealing of pistons. The cross-section of the ISC O-Ring
is not deformed by this. The advantage of this type of
installation lies in its ease of movement and the minimal
wear of the ISC O-Ring. During the pressure build-up a
little bit of air can escape before the ISC O-Ring closes
the gap between the piston and cylinder wall.
When determining the ISC O-Ring the following should
be considered:
The outside diameter of the ISC O-Ring should be
2% - 5% greater than that of the cylinder diameter.
The inside diameter of the ISC O-Ring may not abut
against groove base.
r
2
r
1
t
-
0
,
0
5
b
1
d
9
f
7
Ø
d
4
H
8
Ø
Fig. 7
ISC O-Ring groove dimensions for fitting
in pneumatics - axial movement - without
compression under pressure
d
2
d
1
Ø
d
2
Groove depth
t + 0,2
Groove width
b
1
+ 0,2
1,78 2,1 2,1
1,80 2,1 2,1
2,40 2,7 2,8
2,62 3,0 3,0
2,65 3,0 3,1
3,00 3,4 3,5
3,53 4,0 4,0
3,55 4,0 4,0
5,30 6,0 6,0
5,33 6,0 6,1
5,70 6,4 6,5
6,99 7,9 7,9
7,00 7,9 7,9
Tbl. 11
Processing
If possible, the mounting grooves for ISC O-Rings
should be square. If necessary due to reasons of
manufacturing compatibility, the flanks can be angled
up to 5°.
The surface area of the mounting groove must always
be larger than that of the ISC O-Ring cross-section
(≈25%) in order that the pressure can be distributed
across a relatively large portion of the ring surface and
so that there is sufficient room in the installation space
for a possible increase in volume caused chemical
influences.