Features For plain shafts Dual seal Unbalanced Rotating multiple springs Independent of direction of rotation Seal concept based on the M7 range Variant with pumping screw available (M74F-D) Advantages Efficient stock keeping due to easily interchangeable faces Extended selection of materials Flexibility in torque transmissions EN 12756 (For connection dimensions d1 up to 100 mm (3.94")) Operating range Shaft diameter: d1 = 18 ... 200 mm (0.71" … 7.87") Pressure: p1 = 25 bar (363 PSI) Temperature: t = -50 °C ... 220 °C (-58 °F … 428 °F) Sliding velocity: vg = 20 m/s (66 ft/s) Axial movement: d1 up to 100 mm: ±0.5 mm d1 from 100 mm: ±2.0 mm Materials Seal face: Silicon carbide (Q1) Seat G9: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1) Seat G4, G6 (Q1, Q2), Seat G13 (A, B) Secondary seals: EPDM (E), FKM (V), FFKM (K) Springs: CrNiMo steel (G) Metal parts: CrNiMo steel (G), Duplex (G1)