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STRAUB-STEP-FLEX<br />
The pipe connection for different pipe<br />
diameters<br />
STRAUB-STEP-FLEX overcomes large diameter differences<br />
from 10 to 30mm. In order to protect the sealing<br />
sleeve, a stainless steel strip insert is included.<br />
Because of the differences in diameter, internal forces<br />
(refer to the table of forces below) always press the<br />
STRAUB-STEP-FLEX coupling towards the smaller<br />
pipe diameter which therefore has to be prevented from<br />
slipping by appropriate measures; a coupling retainer<br />
is available on request. Such retainers are not required<br />
for non-pressurised applications.<br />
STRAUB-STEP-FLEX couplings are available in FLEX<br />
2 or FLEX 3 widths.<br />
• STEP-FLEX 2 from 250 up to 812.8 mm<br />
(LS, LU, LV, H, XS)<br />
• STEP-FLEX 3 from 914.4 up to 4064.0 mm<br />
(LS, LV, H, X)<br />
All STRAUB-STEP-FLEX specifications are identical to<br />
those of the respective STRAUB-FLEX devices.<br />
Type<br />
Pipe 1<br />
[mm]<br />
Pipe 2<br />
[mm]<br />
PS max.<br />
[bar]<br />
Compensation of diameter differences when installing controls<br />
and instruments<br />
F2<br />
Table of forces for coupling retainer → ← FR<br />
F1<br />
STRAUB-<br />
STEP-<br />
FLEX 2<br />
STRAUB-<br />
STEP-<br />
FLEX 3<br />
Coupling retainer<br />
(FR at PS max.)<br />
[N]<br />
PS min.<br />
[bar]<br />
Coupling retainer<br />
(FR at PS min.)<br />
[N]<br />
250.0 280.0 24.0 29960 12.0 14980<br />
323.9 353.0 25.0 38860 9.5 14690<br />
406.4 436.0 25.0 48940 7.5 14680<br />
609.6 639.0 25.0 72040 5.0 14410<br />
812.8 842.0 22.0 82938 3.5 13195<br />
1219.2 1249.0 17.0 98160 3.5 20210<br />
1600.0 1630.0 13.5 102690 2.5 19020<br />
2032.0 2062.0 10.0 96410 2.0 19280<br />
3048.0 3078.0 6.5 93770 3.0 43280<br />
4064.0 4094.0 5.0 96060 1.0 19210<br />
Intermediate values can be interpolated<br />
Example for ordering:<br />
STRAUB-STEP-FLEX 2LS 275 / 260 mm, EPDM/SS<br />
STRAUB-STEP-FLEX 3H 1190 / 1120 mm, EPDM/GALV<br />
←<br />
FR = (F2 - F1)<br />
Drawing STRAUB-STEP-FLEX 2<br />
Technical Manual 2012/01 37