Class P unbalanced seals
P21, P22

Class P unbalanced seals
P21, P22

Class P unbalanced seals <br/>P21, P22
Drawing shows
P21 Mechanical seal

Class P unbalanced seals
P21, P22

Features

  • Rotating multi-spring pusher seals
  • Unbalanced
  • Compact in lenght
  • Available as O-Ring or wedge variants
  • Hard/hard seal face combination available
  • Uniform seal face loading
  • Exotic compatible metallurgy for hardware
  • Independent of direction of rotation
  • Available as single, dual and tandem arrangements

Advantages

  • Suitable for a wide range of abrasive and corrosive fluids
  • Over 35 years of running reference in the field
  • Narrow cross-section allows the seal fitment in narrow stuffing boxes
  • Lower inventory since all parts except seal ring composite are interchangeable with Class P balanced seals (P23, P24).

Operating range

Shaft diameter: d = 25 … 100 mm (1" ... 3.94")
Pressure: p = vacuum to 16 bar (232 PSI)
Temperature:
t = -75 °C ... +260 °C (-103 °F ... +500 °F)
Sliding velocity: vg = 25 m/s (82 ft/s)
Axial movement: ±0.5 mm

(Consult EB for applications outside above limits).

Materials

Seal ring: Carbon graphite resin impregnated,
Carbon graphite antimony impregnated,
Tungsten carbide, Silicon carbide
Mating ring: Silicon carbide, Tungsten carbide
Secondary seals: FKM, NBR, FFKM, PTFE
Springs: Hastelloy® C-4
Metal parts: SS 316, other materials on request.

Recommended piping plans

API Plans 01, 02, 03, 11, 12, 13, 14, 21, 22, 23, 31, 32, 41, 52, 53A, 53B, 53C, 54, 55, 61, 62, 65A, 65B, 66



Product variants

P22 mechanical seal with wedge

Similar products

Class E balanced seals E03, E04, E13, E14

  • Rotating single-spring pusher seals
  • Balanced
  • Robust seal design
  • Available as O-Ring or wedge variants
  • Hard/hard seal face combination available
  • Independent of direction of rotation
    (E13, E14)
  • Available as single, dual and tandem arrangements

Class E unbalanced seals E01, E02, E11, E12

  • Rotating single-spring pusher seals
  • Unbalanced
  • Robust seal design
  • Available as O-Ring or wedge variants
  • Hard/hard seal face combination available
  • Independent of direction of rotation
    (E11, E12)
  • Available as single, dual and tandem arrangements

Class P balanced seals P03, P04, P13, P14

  • Rotating multi-spring pusher seals
  • Balanced
  • Compact in length
  • Available as O-Ring or wedge variants
  • Uniform seal face loading
  • Circlip design for ease of assembly
    in P13 / P14 seals
  • Independent of direction of rotation
  • Available as single, dual and tandem arrangements
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