• Engineered Seals For Demanding Applications

PP – D

  • Dual seal configuration
  • Balanced design
  • Independent of direction of rotation
  • Semi-Cartridge construction
  • Double pressure balanced design
  • Designed with provision for internal barrier fluid circulation
  • No dynamic O-Ring on the shaft
  • Robust construction with shrink-fitted seal faces
  • Seal faces have a large clearance to the shaft
  • Static springs on both the sides

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Details

  • 1

    Seal face

  • 5

    Seat

  • 13

    Sleeve

  • 16

    Housing

  • 18

    Pin

  • 37

    Assembly fixture

  • 2, 12, 15, 22, 23, 24, 25

    O-Ring

  • 43

    Plug

  • Test

  • Seals can be operated with pressurized buffer fluid or with quench
  • O-rings are dynamically loaded to prevent shaft damage
  • Easy and trouble-free installation
  • Due to large radial clearance, the damage to the seal faces are avoided, in addition to the seal faces being protected by strong steel parts
  • Misalignment during installation and operations is reduced due to the static springs on both the faces
  • Dual seal can also be used as a single seal by removing the atmospheric seal parts
  • Pulp and paper industry
  • Chemical industry
  • Clean, abrasive or corrosive liquids
  • Stocks of various kind
  • Applications where crystallization is a problem
  • Seal face: Silicon carbide (Q12), Carbon (A)
  • Secondary seals: FKM (V), EPDM (E), FFKM (K)
  • Metal parts: CrNiMo steel (G), Grade 5A (4T), SMO 654 (4U)
  • Temperature: t = -20 °C … +140 °C (-4 °F … +284 °F) (180 °C (356 °F) with FFKM elastomers)
  • Pressure: p1 … 25 bar (363 PSI), p3
  • Speed= 20 m/s(66ft/s)
  • Non-flow operation: Temperature: t = +5 °C … +100 °C (+41 °F … +212 °F)
  • Pressure: p1 max. 10 bar (145 PSI), p3 > p1
  • Sliding velocity: vg … 20m/s (66 ft/s)
  • Ahlstar UP A MS21 range of pumps
  • Sulzer A, APP/APT pumps
  • Sulzer SL mixers
  • Metso conical refiners
  • Stock pumps

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