Single Spring Unbalanced/Balanced Mechanical Seals

LPS-021-U/LPS-025-U & LPS-031-B/LPS-035-B

LPS-021-U / LPS-025-U & LPS-031-B/LPS-035 series are internal mounted single spring unbalanced/balanced Mechanical Seals suitable for wide service applications. It is independent of direction of rotation, these seals driven by drive ring or drive collar, rotary is driven by the motion transmitted by shaft to spring, seals are having easy fitment & pushed with drive ring or drive collar support. As all parts are Interchangeable, one can convert this series LPS-021-U/ LPS-031-B to LPS-025-U/LPS-035-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-021-U: Viton, EPDM, Silicon, EPR, Kalrez, Aflas


Hardware & Spring:

SS 316, SS 304, Hastelloy – C, Monel, Alloy -20


  • Petrochemicals
  • High hydrocarbons
  • General chemicals
  • Petroleum refineries
  • Dirty water & slurry

Seal Characteristics:

  • Unbalanced / Balanced
  • Single acting
  • Inside mounted
  • 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 200°C
  • Shaft Speed : Up to 3000 RPM

Quick Contact