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Home > Seal Application Limits > Watery Substances
Mechanical Seal Application Limits
Typical PV – Limits of face material combinations in non-lubricating fluids, i.e. watery substances
PV = face pressure x velocity
Is an indicator for the severity of an application
Is limited in usefulness
For lubricating fluids multiply number by 1.5
| Primary Ring | Mating Ring | PV
Limit (MPa x m/s) |
PV
Limit (psi x ft/min) |
| Glass-Filled PTFE | Ceramic / Silicon Carbide | 6.13 | 25,000 |
| Carbon | Cast Iron | 24.52 | 100,000 |
| Carbon | Ceramic | 24.52 | 100,000 |
| Carbon | Tungsten Carbide | 122.59 | 500,000 |
| Carbon | Silicon Carbide | 147.11 | 600,000 |
| Tungsten Carbide | Tungsten Carbide | 24.92 | 120,000 |
| Silicon Carbide | Silicon Carbide | 85.81 | 350,000 |
Next: Typical angular misalignment limits
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