Wave Spring Unbalanced/Balanced Mechanical Seals

LPS-121-U/ LPS-125-U & LPS—131-B/LPS/135-B

LPS-121-U/ LPS-125-U & LPS—131-B/LPS/135-B series are single wave spring unbalanced/balanced Mechanical Seals designed for most general applications. It is independent of direction of rotation, major advantage of this seal is due to use of single wave spring it is of compact design with reduced axial length, their compact design easy to install. These seals can also be used in dirty application as spring clogging does not occur; torque transmission from retainer shell to seal ring is through drive pin. All parts are interchangeable, one can convert this series LPS-121-U/LPS-131-B to LPS-125-U/LPS-135-B by changing only the dynamic ring and the secondary seal, this principle is ideal for stock rationalization, this seals are comfortable to use in wide range of application as below:

Material of Construction:

Seal Faces: (Dynamic & Stationary Ring)

Carbon, Ceramic (99.5%), Silicon Carbide, Tungsten Carbide & which are suitable for fluid

Secondary Seal:

LPS-121-U: Viton, Kalrez, Silicon, Aflas


Hardware & Spring:

SS 316, SS 304, Carpenter-42, Alloy-20


  • Hydrocarbons
  • Light sewage water
  • High viscosity fluids
  • Light abrasive slurry
  • General & Light chemicals

Seal Characteristics:

  • Unbalanced / Balanced
  • Single acting
  • Inside mounting
  • Wave spring loaded
  • Independent of direction of rotation

Operating Parameter:

  • Shaft diameter : 19 mm to 100 mm (0.75” to 4.0”)
  • Pressure : Up to 10 bar (kg/cm²)
  • Temperature : -45°C to 220°C
  • Shaft Speed : Up to 3000 RPM

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