Double-cone gaskets0 pages

Double-cone gaskets

Double-cone gaskets are radially compressed like a circular spring by the bolt pre-tensioning force. A pre-tensioning of
approximately 1/3 to 1/5 of the test pressure is generally
sufficient to achieve the necessary initial seal. So that the
gasket does not become
overloaded, only a limited
amount of clearance
should be left between the
cover and the gasket. After
pre-tensioning the gasket
will initially have contact inside to the cover. With the
application of pressure it
will then spring back by the
compressed amount and
if there is sufficient internal
pressure will expand elastically, so that it offers reliable sealing in all operating conditions due to its
optimal design shape.

07

We would be happy to carry out a cost-efficient check for
tracking and to determine the measurements of the doublecone gasket as part of our gasket estimate service. The
illustration above show the design principle.
The measurements of double-cone gaskets are not standardised. We can currently supply sealing rings up to
Ø 3200 mm. The sealing surfaces are conical surfaces with
a sloping angle α. A sloping angle of α = 30° is usual, but is
not suitable in every case.

The sealing layers should be no thicker than 1 mm. Aluminium, copper, nickel and silver layers from 0.5 mm to 1
mm in thickness have proven successful.
If the sealing layers can no longer be produced in one piece
from the semi-finished product, they will be welded. The thickness of the welded joint deviates from the layer thickness by
between +0.1 mm to -0.05 mm.
Profile AR16 has convex sealing surfaces. The convex model
has proven particularly reliable where the strains and curvatures of the component vary greatly, where layers of soft metal
are not suitable.
Gasket profiles
Profile

Cross-section

Material

k0
[mm]

Steel

-

A16

AR16

Steel

-

-

Cu, Ni,
A19
Al, Ag

bD

bD+5

* Recommended maximum roughness of the flange
surfaces.

Double-cone
gasket
Profile A16

There are frequently two or three grooves of a few millimetres wide and a few tenths of a millimetre deep on each
conical surface. The grooves fix the enclosed sealing layers
into position. The layers provide a better initial sealing behaviour.

Kempchen Dichtungstechnik GmbH · Tel. +49 (0)208 8482 0 · Fax. +49 (0)208 8482 285 · info@kempchen.de · www.kempchen.de

Double-cone gaskets

1,6
bis
3,2

Sealing layer
Profile A19

102

k1
RZ*
[mm] [µm]

3,2
bis
6,3
6,3
bis
12,5