How a Self-Retaining Static Seal Efficiently Seals Bores in Non-Pressurized Applications

What can be done if a bore requires radial sealing but lack of a lead-in chamfer prevents the installation of a seal? A situation like this occurs for instance when an existing bore should be closed with a cover and the space around the bore is too small for a classic flange seal. A seal would not survive an attempt to install it in a bore without a lead-in chamfer. Part of the seal would be sheared off at the edge of the bore even if the edge were chamfered or rounded.

The principle: rolling instead of sliding

The Roll2Seal® concept solves this problem. Instead of destructively squeezing the seal at the critical edge it is simply made to roll across it. This is achieved by providing the cover with a geometry which, together with the edge of the bore, forces the seal to rotate. Subsequently, the triangular cross section of the seal makes it possible for the seal to roll off at the dangerous edge of the bore with a minimum seal height and thus without risk of seal damage.

Roll2Seal® – the self-retaining static sealing solution for easy and reliable closure of bores

Innovative geometry
No lead-in chamfer
No deburring
No lubrication
Immune to unbroken edges of the bore
Metal or plastic cover
Available in pre-assembled condition
Easy installation
Suitable for repeated and overhead installation
Space- and cost-saving

Applications are found

where bores already exist for subsequent installation of additional component assemblies but require effective temporary or permanent sealing (e.g. for test runs or shipping),
where lubrication during the assembly process is not possible,
where non-pressurized systems require reliable sealing without screw connections.

Additional information:

Posted by Samuel Brenner, application engineer, Engineered Materials Group Europe, Prädifa Technology Division