Statotherm V Cover seal V901/…

Statotherm V Cover seal V901/…

Statotherm V Cover seal V901/…


Statotherm V cover seals V901 (self-sealing) are precision-made seals made from permanently elastic, expanded graphite (purity ≥ 99%) without binders or fillers. Cover seals are successfully used as self-sealing closures in high pressure valves, e.g. for power stations at high temperatures and up to 1,000 mm diameter.


  • Easy to assemble and disassemble
  • No damage to the sealing surfaces
  • Long service life
  • Do not harden
  • Optimized sealing result
  • Minimum wear of the contact surface

Operating range

Pressure: p = 500 bar
Sliding velocity: vg = 2 m/s
  • Continuous operation:
    t = -200 °C … +500 °C
  • Steam: tmax+550°
Recommended surface roughness:
RZ = 10 - 40 μm
Chemical resistance: pH = 0 … 14
Resistant to almost all organic and inorganic acids, alkalis, oils and solvents.

Density (raw material): 0.7 or 1.0 g/cm3
V901/B5: density 1.3 g/cm3
V901/B6: density 1.4 g/cm3
V901/B7: density 1.6 g/cm3
V901/B8: density 1.8 g/cm3


Rectangular profile (without, or with one or with two end caps):
V901/R7, V901R7K, V901RKK, V901RWK

Outer chamfer (without, with one or with two caps):
V901/A7, V901A7K, V901AKK

Inner chamfer (without, with one or with two caps):
V901/I7, V901I7K, V901I
For applications in nuclear power plants, with a graphite purity > 99,85%:


Design and ordering information
The design of the cover seal depends on the pressure and dimensions. Please specify the operating conditions and profile shape with any enquiries or orders (example: pressure in bar, diameter d1 and d2, profile shape I, A or R).

Forms of supply

  • Die-pressed rings, to drawing, measurements or other agreement