Mechanical Seal Carbon Bushings: Key Technical Parameters (English Version)
Parameter Category | Specifications | Reference |
---|---|---|
Material Composition | High-density carbon graphite (C) with anti-friction additives | 26 |
Inner Diameter Range | 10-120 mm (Standard) | Customizable up to 300 mm |
Operating Temperature | -50ºC ~ 350ºC (Dry conditions) -20ºC ~ 200ºC (Lubricated wet environments) | 26 |
Pressure Tolerance | ≤2.5 MPa (Static) ≤1.0 MPa (Dynamic rotating applications) | 37 |
Hardness | 80-100 Shore A (Graphite base) 120-140 HV (Carbon composite variants) | 36 |
Thermal Conductivity | 40-60 W/m·K (Enhances heat dissipation in high-speed seals) | 67 |
Surface Finish | Ra ≤0.4 μm (Polished sealing surface) Axial parallelism tolerance: ±0.02 mm | 37 |
Chemical Compatibility | Resists acids, alkalis, and hydrocarbons (e.g., HSO, NaOH, crude oil) | 26 |
Wear Rate | ≤0.05 mm/1000h (Under ISO 18134 abrasive particle test) | 37 |
Key Applications | Centrifugal pumps, compressors, mixers, and reactors in: - Petrochemical plants - Power generation turbines - Food processing equipment | 27 |
Critical Design Features
Self-Lubricating Properties
Carbon bushings reduce friction without external lubrication, ideal for dry or semi-dry operations6.Thermal Shock Resistance
Low thermal expansion coefficient (4.3×10/ºC) ensures stability in rapid temperature cycling3.Customizable Profiles
Available in split designs for easy maintenance or solid rings for high-pressure sealing7.Anti-Galling Design
Carbon-graphite matrix prevents adhesion to mating metal surfaces (e.g., stainless steel shafts)6.
Maintenance Guidelines
- Installation: Ensure shaft radial runout ≤0.05 mm to avoid uneven wear3.
- Storage: Keep in dry environments to prevent moisture absorption (max. humidity 60%)7.
- Compatibility: Avoid pairing with brass/bronze components in chloride-rich media










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