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CMS API Standard Cartridge


Our Standard CMS API Cartridge balanced and designed according to API 682 / ISO 21049, can be single or double:

- Double seal with API Plan 52/53 (CMSAPI-DAP)
- Unique seal with API Plans 11 and 61 (

The sealing faces are embedded and solid, while the springs are protected from the product. This type of mechanical cartridge seal adapts shaft deflections and process fluctuations. In addition, it has a good heat dissipation, a low space requirement and a pre-assembled unit ready to install. It is usually used for pressure inversion.

We also have available the version of this closure with independent rotation direction.

Industrial Applications:
  • Chemical industry
  • Light volatile and highly viscous hydrocarbons
  • Low solids content and low abrasive media
  • Media with poor lubrication properties Oil and gas industry
  • Petrochemical industry
  • Toxic and hazardous media
  • Standard pumps
  • Vertical and horizontal ANSI chemical pumps

Technical characteristics

  • Sizes: d1 = Upto110 mm (Upto 4.250’’) other sizes on request
  • Pressure: p1 = 22 bar (319 PSI)
  • Temperature: t = -40 °C … 260 °C (-40 °F ...500 °F)
  • (>220 °C (428 °F) please enquire)
  • Speed = 23 m/s (75 ft/s)


  • Seal face: Carbon graphite antimony impregnated (A), Silicon carbide sintered pressureless (Q12)
  • Seat: Silicon carbide sintered pressureless (Q1)
  • Secondary seals: FKM (V), FFKM (K), NBR (P), EPDM (E)
  • Springs: Hastelloy® C-4 (M)* and C-276 (M5)
  • Metal parts: CrNiMo steel (G)
  • Factory and Headquarters
  • Sealmek Factory
  • Official Distributor