Composition
The gaskets are made of
- expanded mineral graphite
- Nickel metal insert.
- Middle rings: expanded mineral graphite (V48Z OXY)
- Top & bottom rings: expanded mineral graphite with nickel metal insert (V48ZN OXY)
Characteristics
These gaskets made of variable density expanded graphite with anti-extrusion rings are specifically designed for high-temperature applications on ball valve seats.
The CONTROLLER BACK1 OXY is configured to provide a compression of 10–20%, ensuring a high recovery capability.
Reference certificates:
- ZV48ZN OXY – no. 2-1948 2014E
- ZV48Z OXY – no. 2-1949 2014E
Applications
Gaskets ideal for ball valves intended for oxygen service, covering a wide range of pressures up to Class 1500 psi.
Expanded mineral graphite can operate over the entire pH range, at very low as well as high temperatures.
For applications with oxygen concentration < 100% and for non-oxidizing applications, the following limitations and exclusions must be considered:
- With mildly oxidizing agents, hot air and combustion gases, the temperature must be limited to 450°C.
- With non-oxidizing agents, the maximum continuous operating temperature is 600°C, with a peak limit for short exposures of 650°C.
- Graphite is not compatible with strong oxidizing agents.
- Graphite is suitable for cryogenic applications and oxygen service, with temperature limitations depending on concentration.
- The metallic insert must be compatible with the service fluid.
