Statotherm V Cover seal V881-…

Statotherm V Cover seal V881-…

Statotherm V Cover seal V881-…


Statotherm V cover seals V881 (self-sealing) consist of pure graphite rings (purity > 99%) with an embedded stainless steel reinforcement. They are used in particular in applications with large gaps and high pressures. For example, Statotherm V cover seals V881 are used successfully in power stations at high temperatures and with diameters of up to 1,000 mm.


  • Especially suitable for sealing large gaps
  • 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 = 800 bar
Sliding velocity: vg = 2 m/s
  • Continuous operation:
    t = -200 °C ... +500 °C
  • Steam: tmax = +550 °C
  • in a reducing or inert environment: tmax = +3.000 °C
Recommended surface roughness: Rz = 10 ... 40 μm
Chemical resistance: pH = 0 ... 14
Resistant to almost all organic and inorganic acids, alkalis, oils and solvents.

V881-B6: density 1.3 g/cm3
V881-B7: density 1.4 g/cm3
V881-B8: density 1.6 g/cm3


V881/R7 (rectangular)
V881/A7 (outer chamfer)
V881/I7 (inner chamfer)
V881/R7K (rectangular with one cap)
V881/A7K (outer chamfer with one cap)
V881/-I7K (inner chamfer with one cap)
V881/N7 (for applications in nuclear power plants, graphite purity > 99,85%)

Functional description

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).


Minimum surface pressure:
The seal and preloading are generally created by the working pressure, but there is a minimum surface pressure that must be achieved when the seal is installed.

Forms of supply

  • Die-pressed rings, to drawing, measurements or other agreement
  • Available in different densities and profiles

Similar products

Statotherm R profile rings R901/B..

Statotherm R profile rings R901/B are made from permanently elastic, expanded graphite (purity ≥ 99.85%, ash content ≤0.15 %, chloride content ≤20 ppm) without binders or fillers. Statotherm R profile rings R901/B are almost maintenance-free and are intended for exposure to extreme temperature cycling and/ or high or low temperature ranges which cannot be withstood by elastomeric O-rings.

Statotherm Tape 6750/INC

Statotherm tape 6750/INC is a braided tape made from graphite yarn reinforced with Inconel wires. It also has an adhesive backing.

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.

Inquire about individual solutions

We develop and produce customer-specific special and individual solutions for every application.

Inquire now Discover reference projects
Back to the overview