Key Specifications / Features
This large-diameter butterfly valve packing set is engineered for reliable sealing in high-performance valve applications. With dimensions of ID 170 mm x OD 186 mm, the packing is constructed from anti-oxidation graphite and reinforced with braided Inconel 600 wire for superior thermal resistance and mechanical strength. Compliant with ISO 15848-1 and API 622 standards, it ensures low emissions and long service life, making it ideal for critical service valves in industries such as oil and gas, petrochemical, and power generation.
- Model No.: MV-20250710-GP-03
- Hits: 9
- Categories: Graphite Packing , PTFE Packing
- Tags: Large-Diameter Valve Packing, Butterfly Valve Packing, Graphite Valve Packing
Detail Information
Product Name: Low-Emission Packing Set for Large-Diameter Butterfly Valves
Model: M641
Size: ID 170 mm * OD 186 mm (single-side width 8 mm)
Material Properties:
Graphite Purity: ≥99.5 %
Construction: Anti-oxidation graphite + braided Inconel 600 wire (20 %)
Sulfur Content: ≤50 PPM
Chlorine Content: ≤20 PPM
Certifications: ISO 15848-1, TA-Luft, API 622
Operating Conditions: –45 °C to +425 °C
Operating Parameters
Speed: 2 m/s
Temperature Range: -200°C to +400°C (for most media), -200°C to +550°C (for steam)
pH Value: 0 to 14
Pressure: 25 MPa
Media: Suitable for most chemical substances (solvents, hydrocarbons, acids, alkalis, steam, alcohol, oil)
Except for strong oxidizing acids, such as sulfuric acid and nitric acid.
Key Benefits
The packing compensates for large stem diameters and narrow packing widths.
High rebound and deformation ensure tight seal despite micro-movements.
Full compliance with international low-emission standards.
Design Challenge & Solution
Narrow Width + Large Stem: With only 8 mm side width, the packing must compensate for stem micro-movement (less than 0.8 mm at 10 % graphite rebound) while allowing for machining tolerances (about 0.15–0.2 mm).
Special Geometry: A butterfly (convex-concave) and upper/lower V-ring configuration is adopted to:
1. Increase graphite expansion capability.
2. Provide greater radial deformation for large-size packings.
High-Density End Rings (2.5-2.6 g/cm³): Transmit bolt preload rapidly to the centre pure-graphite rings, causing immediate deformation and sealing.
Sequential Deformation: Centre rings reach min 1.6 g/cm³ to end rings deform to stable, self-reinforcing seal (validated by extensive testing and field use).
