Pure Flexible Graphite
The Valvograph department is able to produce tailor made die-formed graphite rings from 10.0 to 2,000.0 mm for different applications.
The gaskets are codified V48, V48R if energised and V48 OXY BAM approved for oxygen service.
Graphite die-formed rings for industrial Valves.
| Typical properties of the Valvograph rings Style V48Z | Units | Value |
|---|---|---|
| Density | g/cm³ | 1.40 ÷ 1.70 |
| Ash content | % | ≤ 0.15 |
| Carbon content | % | ≥ 99.85 |
| Chloride content | ppm | ≤ 10 |
| Fluoride content | ppm | ≤ 10 |
| Halogen content | ppm | ≤ 40 |
| Sulfur content | ppm | < 300 |
| Oxidation rate at 670°C | % | < 4 |
| Oxidation inhibitor | - | Y |
| Passive corrosion inhibitor | - | Y |
| Dimensions | mm | 10 ÷ 2300 |
| Tollerances (mm) | Out. D. | Inn. D. | Th. | Wall | Bulk Density |
|---|---|---|---|---|---|
| up to 250 mm | [-0,20 ÷ 0,00] | [-0,00 ÷ 0,20] | +/- 0,20 | [-0,20 ÷ 0,00] | +/- 5,00% |
| from 251 to 500 mm | [-0,25 ÷ 0,00] | [-0,00 ÷ 0,25] | +/- 0,20 | [-0,25 ÷ 0,00] | +/- 5,00% |
| from 501 to 750 mm | [-0,30 ÷ 0,00] | [-0,00 ÷ 0,30] | +/- 0,25 | [-0,30 ÷ 0,00] | +/- 5,00% |
| from 751 to 2300 mm | [-0,40 ÷ 0,00] | [-0,00 ÷ 0,40] | +/- 0,75 | [-0,40 ÷ 0,00] | +/- 7,00% |