An expansion joint design with self-sealing rubber bulges and swivel backing flanges is available for types without, with single and multiple arches. The rubber flange of the bellows is designed as a sealing bulge with an embedded steel core.
The sealing bead eliminates any requirement for gaskets between mating flanges.
Flanges of glass reinforced epoxy piping (GRP) cannot withstand the required tightening torques of full-faced rubber expansion joint fixed to without cracking depending from design pressure and pipe standard. In order to avoid special measures on the GRP pipe flange ditec has developed a special sealing technology in the bellows rubber flange to lower the torques by approx. 50 %. This also eliminates the need for any grooves for O-rings in the GRP flange and the most economic flat face GRP flange can be applied.
Expansion joints in GRP pipelines with collar flange fixing and backed steel rings the rubber flange surface shall have a raised face up to the outer diameter of the GRP stub to avoid cutting of sharp edges into the rubber. Rubber expansion joints with sealing bead and swivel flanges installed in GRP pipelines do not require any special measure because of the small sealing width of the bead.
We can furnish all our expansion joint types meeting the following drilling/flange standards, among others.
For custom drilling or flange data not shown, please contact us.