Spiral seals consist of a strip, most often made from stainless steel but sometimes from other materials depending on use, profiled in a V shape and wound in a spiral with tape (generally graphite) inserted between turns to suit the fluid pressure and temperature.
Seals with graphite tape inserts show very good creep and pressure resistance while having excellent elastic recovery. They achieve far greater leak tightness than seals cut from fibre and compressed elastomers and also require less compression.
There are two main types of seal which are both standardised:
- C/O type with external centering ring
- C/I type with external centering ring and inner ring
| Thickness of spiral |
4.5mm |
| Thickness of centering ring |
3.2mm |
| Pressure resistance |
400 bar |
| Temperature resistance |
-200 à +700°C1000°C
in non-oxidising medium |
| Resistance to chemicals: |
oil water, air, steam, organic and inorganic acids, alkalis, solvents. Not suitable for powerful oxidising agents. |
Other seal materials
A broad variety of materials can be used both for the centering ring (other stainless steel grades, nickel alloy, inconel, titanium, etc.) and for the spiral (graphite, PTFE, ceramic). Please enquire.
Fields of application
Chemicals, petrochemicals, industrial, food processing, etc.
Steam circuit pumps, valves, fittings, etc.
Low pressure pipelines, diesel engine exhausts, etc.
Identification
The different seal types are identified by a standardised colour code located on the seal edge.
For 316L + graphite seals, the edge must be green.
|
