John Crane 58U multi-spring mechanical seal Unbalanced pump seal john crane 58u mechanical seal type for industrial pump Shaft diameter: d1=14...100 mm Pressure: p=0...1.7Mpa(246.5psi) Temperature: t = -40 °C ..+200 °C(-40°F to 392°) Sliding velocity: Vg≤25m/s(82ft/m)