| Model |
QT - Mflct8 |
| Type |
Double - acting mechanical seal |
| Application |
Ideal for use in high - pressure pumps, agitators in pharmaceutical and pulp & paper industries |
| Operating Temperature |
-30°C to 200°C |
| Operating Pressure |
0 to 4 MPa |
| Shaft Diameter |
25 mm - 120 mm |
| Rotational Speed |
Up to 3600 RPM |
| Sealing Face Materials |
Tungsten carbide (Hardness: HRA 88 - 92; Density: 14.5 - 15.5 g/cm³) paired with alumina ceramic (Hardness: HRA 85 - 88; Density: 3.8 - 4.0 g/cm³) |
| Secondary Sealing Element |
Ethylene - propylene rubber. Compression set: ≤ 30% (70h at 120°C); Tensile strength: ≥ 8 MPa; Elongation at break: ≥ 180% |
| Spring Material |
Inconel 625. Elastic modulus: 205 GPa; Yield strength: ≥ 345 MPa |
| Housing Material |
Stainless steel 316L. Tensile strength: ≥ 485 MPa; Yield strength: ≥ 170 MPa; Hardness: ≤ 217 HB |
| Leakage Rate |
≤ 3 ml/h under standard operating conditions |
| Friction Coefficient |
0.08 - 0.15 between the sealing faces |
| Wear Rate |
Face wear rate: ≤ 0.03 mm/year; Secondary seal wear rate: ≤ 0.08 mm/year |
| Installation Dimensions |
Overall length: 60 - 180 mm (varies with shaft diameter); Outer diameter of housing: 70 - 140 mm (varies with shaft diameter) |
| Axial Movement Tolerance |
± 0.6 mm |
| Radial Movement Tolerance |
± 0.25 mm |
| Chemical Resistance |
Resistant to a wide range of chemicals including weak oxidizing acids (e.g., nitric acid up to 10% concentration), strong alkalis (e.g., potassium hydroxide up to 30% concentration), and many organic solvents like toluene and xylene |
| Seal Life |
Expected service life of 3 - 5 years under normal operating conditions |
| Balance Ratio |
0.65 - 0.75 |
| Torque Requirement |
2 - 8 Nm for installation (depends on shaft diameter) |
| Static Sealing Force |
150 - 600 N (depends on pressure and shaft diameter) |
| Dynamic Sealing Force |
300 - 1000 N (depends on pressure, speed, and shaft diameter) |
| Surface Finish of Sealing Faces |
Ra ≤ 0.15 µm for tungsten carbide face; Ra ≤ 0.1 µm for alumina ceramic face |
| Coefficient of Thermal Expansion |
Tungsten carbide: (4 - 6)×10 /°C; Alumina ceramic: (6 - 8)×10 /°C |
| Noise Level |
≤ 55 dB(A) during normal operation |
| Vibration Level |
≤ 4 mm/s during normal operation |
| Heat Dissipation Rate |
50 - 150 W/m²K |
| Assembly Tolerance |
Concentricity: ≤ 0.05 mm; Perpendicularity: ≤ 0.03 mm |
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