Lionpak^® graphite moulded rings

• Outstanding sealing performance over long adjustment-free periods
• Excellent chemical resistance
• Very wide temperature range

Valves and rotary equipment handling virtually any media. These rings are ideal for duties with high-temperature steam, demineralised water, heat transfer media, petroleum products, inorganic and organic acids, alkalis, hot waxes and oils.

Valve stem duties

• Maximum operating temperature in steam: +650°C (+1202°F)
• Maximum operating temperature in oxidising conditions: +500°C (+932°F)
• Maximum operating temperature in non-oxidising conditions: +1000°C (+1832°F)
• Minimum operating temperature: -200°C (-328°F)
• Maximum system pressure: 25 MPa/250 bar (3626 psi)

Certain rotary equipment

• Dependant on application, please contact James Walker for further details for rotary duties

Recommended ring densities

• For valve stem duties: 1.6 g/cm3 (SG 1.6)
• For rotary duties: 1.5 g/cm3 (SG 1.5)
• For special applications: mixture of ring densities

• Compatible with media in the range pH 0 -14
• Sulphur content (typical): ≤ 300 ppm
• No loss of volatiles at high temperature
• Lower limiting temperatures apply when used with oxidising agents, e.g. nitric acid
• Thermal conductivity, ring of density 1.4 g/cm3: (SG 1.4): axial: 400 W/mK; radial: 6 W/mK
• Coefficient of friction to steel: 0.05

• Precision moulded rings in endless form, or with single split or matched scarf-split halves. Sections 1.5 mm to 40 mm (¹/₁₆" to ¹⁹/₁₆"); diameters 2 mm to 1200 mm (or ³/₃₂" to 47 ¹/₄")