Teflon-Elastic-envelope gaskets with insert
Teflon-enveloped gaskets are used for a number of different applications. Depending on the construction (insert) they are suitable for use in many sectors.
The combination of a Teflon envelope and soft material / corrugated ring inserts provides high-level chemical resistance plus a wide range of applications.
Optimised design of stainless steel corrugated ring and the Teflon-envelope allows this sealing system to be used under simultaneous 40 bar pressure and 200°C temperature.
Other combinations such as Teflon-enveloped gaskets with graphite inserts have also proven their worth, particularly in enamelled flange connections.
Conditions which are often met within the enamelled area of sealing surfaces such as very aggressive media, low seating stress, unevenness and distortions in the flange sealing surface etc. make heavy demands on the sealing system which cannot be met by using a single-material gasket.
The dimensions and properties of the sealing designs listed and the materials are optimally adjusted for use in enamelled flange areas. Teflon envelope, which consists of Teflon with modified molecular chain, takes on the actual sealing function itself.
A 3/4 mm-wide inner diffusion barrier prevents cross-sectional diffusion.
As a further measure against bursting and blow-out, the system has been provided with a stainless steel corrugated ring insert covered by two inserts to provide added improvement to their compression and recovery rate.
Teflon-enveloped gaskets, with lathed, inner inside diffusion barrier and stainless steel corrugated ring |
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Application Steel flanges Operational conditions Pressure: 40 bar Fibre quality The envelope is made of Teflon and features a 4 mm inner diffusion barrier. The stainless steel (standard 1.4571) corrugated ring features a pitch of 3 mm and cross-sectional flat area at the inner diameter. |
Teflon-enveloped gasket, with lathed, inner diffusion barrier and graphite insert |
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Application Plastic, enamelled or rubber-lined flanges, steel flanges. Operational conditions Pressure: 20 bar Fibre quality The envelope is made of Teflon with 4 mm inner diffusion barrier. |
TEFLON - enveloped gasket, with lathed, inner diffusion barrier and compressed aramid fibre insert |
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Application Plastic, enamelled or rubber-lined flanges, steel flanges. Operational conditions Pressure: 20 bar Fibre quality The envelope is made of Teflon with a lathed, inner diffusion barrier and 3 mm compressed aramid fibre material as insert |
Teflon - enveloped gasket, with lathed, inner diffusion barrier, corrugated ring insert and 2 x graphite inserts |
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Application Plastic, enamelled or rubber-lined flanges, steel flanges. Operational conditions Pressure: 20 bar Fibre quality The envelope is made of Teflon with 3 mm lathed, inner diffusion barrier, corrugated ring insert (1.4571) and 2 x graphite inserts. The gasket features excellent compression and recovery behaviour. |
Teflon - enveloped gasket, with lathed, inner diffusion barrier, corrugated ring insert and 2 x compressed aramid fibre inserts |
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Application Plastic, enamelled or rubber-lined flanges, steel flanges. Operational conditions Pressure: 20 bar Fibre quality The envelope is made of Teflon with 3 mm lathed, inner diffusion barrier, a corrugated ring insert (1.4571) and 2 x compressed aramid fibre inserts. |
Electro-static discharge |
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Application In areas where electro-static discharge is required, all Teflon -envelope gaskets with a corrugated ring insert can be made with an earthing tab. |
