M7N Mechanical Seal

Features

  • For plain shafts
  • Single seal
  • Unbalanced
  • Super-Sinus-spring or multiple springs rotating
  • Independent of direction of rotation
  • Variant with PTFE secondary seals for high chemical resistance (M78N)

Advantages

  • Universal application opportunities
  • Efficient stock keeping due to easily interchangeable faces
  • Extended selection of materials
  • Insensitive to low solids contents
  • Flexibility in torque transmissions
  • Self cleaning effect
  • Short installation length possible (G16)
  • Pumping screw for media with higher viscosity (M7..F)

Operating Range

  • m7 mechanical seal webShaft diameter: d1 = 14 ... 100 mm (0.55 " … 3.94 ")
  • 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 25 mm: ±1.0 mm
    • d1 = 28 up to 63 mm: ±1.5 mm
    • d1 = from 65 mm: ±2.0 mm

Materials

  • Seal face: Special cast CrMo steel (S), Silicon carbide (Q1, Q2), Aluminium oxide (V)
  • Seat G9: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B), Silicon carbide (Q1*, Q2*)
  • Seat G4: Silicon carbide (Q1*, Q2*)
  • Seat G6: Silicon carbide (Q1*, Q2*)
  • Seat G13: Carbon graphite antimony impregnated (A), Carbon graphite resin impregnated (B)
  • Secondary seals: EPDM (E), NBR (P), FKM (V), FFKM (K)
  • Springs: CrNiMo steel (G) Metal parts: CrNiMo steel (G), Duplex (G1)

* Cannot be combined with seal face made of S

Standards and Approvals

  • EN 12756