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» SOLID GRAPHITE

Graphite Packing
GRAPHITE is characterised by a high level of chemical resistance and thermal stability as well as an excellent sealing effect and constant elasticity. Regardless of temperature cycle this material will not be subject to cold flow, shrinkage or aging. GRAPHITE fulfills the purity requirements for seals in nuclear power station valves (content of soluble chlorides < 20 ppm).

1. Types

GRAPHITE foil material Approved for use in oxygen applications for pressures up to 250 bar and temperatures up to 200 °C by BAM ( German Federal Institute for Material Testing, Berlin ). Approved for use in food processing industries by the Chemical and Technical Testing Office, Stuttgart, Ger¬many. Tested by DVGW (German Association of Gas and Water Industry) according to the KTW (plastics - drinking water) recommendations of the BGA (Federal Health Office) for use as sealing elements Dl and D2.

GRAPHITE rings Preformed GRAPHITE rings are supplied in densities between 1,4 and 1,85 g/cm3.

GRAPHITE tape is used to make rings for repair purposes. In order to stabilise the material and to ensure ease of handling the material has a surface pattern and a W-profile.

GRAPHITE cover seals are supplied as preformed rings and have shown their advantages in self-sealing covers, e.g. heavy-duty valves, high-pressure feedwater pre-heaters. GRAPHITE remains elastic even with continually changing temperatures and pressures up to 200 N/mm2 surface compression. It can bridge the large sealing gaps which occur in self-sealing covers up to 0,3 mm without difficulty.

Typical Forms:






2. Application
Valves

3. Operating Conditions
Pressure: 1000 bar
Temperature:
- 200°C to +550 °C1)
- 200°C to +700 °C2)
- 200°C to + 2500 °C3)

pH value: 0-14

1) most media and air
2) steam
3) inert gas

4. Media
Hot water and feed water, steam, heat transfer oils, hydro-carbons and many other media. Exceptions: strongly oxidizing media.