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Long Catch Bolt<br />
Long catch bolts help installing the STRAUB-OPEN-<br />
FLEX 3, 3.5, and 4 types. During installation, a standard<br />
bolt is replaced by a long catch bolt (ideally located<br />
in the middle of the lock).<br />
This bolt is used to tension the coupling until the<br />
standard bolt can be installed into the studs. Then<br />
the longer catch bolt is removed and replaced by the<br />
standard bolt.<br />
Earthing Conductor<br />
The STRAUB earthing conductor replaces the external<br />
jumper cable. If required, an electrical jumper cable<br />
from pipe to pipe can be established using a metallic<br />
earthing conductor placed in the coupling. In contrast<br />
to STRAUB-GRIP couplings, STRAUB FLEX and<br />
STRAUB-OPEN-FLEX couplings have no electrical<br />
conductivity and should be considered as insulating<br />
connections.<br />
• Explosion protection (prevents static charging)<br />
• Corrosion protection<br />
• Electrically conductive connection between metallic<br />
pipes<br />
• Earthing connection for cable conduits<br />
Our earthing conductor system has been tested by<br />
the SEV (Swiss Association for Electrical Engineering,<br />
Power and Information Technologies) on the basis of<br />
SEV 04 ATEX 0167 (EN 1127-1:2007 and EN 13463-<br />
1:2009)*.<br />
*The ATEX name refers to the French abbreviation for<br />
“Atmosphère explosible” and is used as a synonym for the<br />
directives of the European Union in the field of explosion<br />
protection.<br />
Stiffening Rings<br />
1<br />
2<br />
1 = Housing<br />
2 = Earthing conductor<br />
(available from Ø 73 mm)<br />
3 = Sealing sleeve<br />
Typical for pipes made of PE / PP materials are the deformation and thermal stretching characteristics. The<br />
material tends to flow under pressure and temperature influences. This process is largely dependent on time.<br />
External radial loading on the pipe requires the use of a STRAUB internal stiffening ring, e.g. with STRAUB-<br />
PLAST-GRIP or STRAUB-FLEX, which also inhibits the tendency of the plastic to flow over the course of time.<br />
The stiffening rings are available in slotted design from 40 mm up to 315 mm and in welded design from 355 up to<br />
1600 mm. They are made of stainless steel (AISI 316 L / DIN 1.4435). When ordering, the exact inner diameter,<br />
SDR number or the wall thickness of the pipe is required.<br />
Plastic pipes (PVC, ABS and CPVC) do not require stiffening rings if the temperature of the medium is below 30°C.<br />
3<br />
Technical Manual 2012/01 45
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