Valvograph Rings V48

Composition

Flexible Mineral Graphite with varying degrees of purity and technical requirements, with ring densities ranging from 1.40 to 1.70 gr/cm3 according to the ring requirements and its dimension.

Characteristics

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.

Applications

Graphite die-formed rings for industrial Valves. They are suitable for a variety of industrial applications that require reliable and durable performance.

Valvograph Rings V48
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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
Temperature Range °C -200 ÷ 450 / 650 
pH - 0 ÷ 14

 

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%