Mechaflex R.S.T. P868

Single cartridge seal

The P868 series is a single cartridge seal intended to provide an excellent sealing performance for pumps. As one of the members of RST Mechanical Seals, P868 is designed to operate in a wide range of process fluids. P868 particularly exhibits high performance in the operation of critical process fluids of non-hydrocarbon, non-flashing hydrocarbon and flashing hydrocarbon.

The improvements in design reliability and robustness are made possible by the utilisation of sophisticated Finite Element Analysis (FEA) Engineering Software. These features are further verified by the usage of ProEight’s high-end testing equipment, the patented mechanical seal static tester – AccuTEST.
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R.S.T Series

The R.S.T Mechanical seals are known for its design which were made using ProEight’s in-house FEA programs, SIGMA-FEA and CELC-FEA combined with ANSYS

These software programs analyze combined seal distortion due to pressure, temperature, stress distortion and face loadings. Steady-state and transient conditions coupled with various possible sealing environments gave a clear overview of the mechanical seals’ performance.

Design Features

  • High flow pattern and distributed flush system
  • Uniform-load Multispring compression unit
  • RST Optimized Seal Face Design
  • Emission Restrictive Throttle Bushing
  • Low-temperature including face (ARCAF)®
    (Subject to design requirements & compatibility)
  • Bolted Auxiliary Gland


- 40 C to 210 C / - 40 F to + 500 F
Up tp 69 bar / 1000 psig
Up to 25 m/s / 5000 fpm

Seal Application

  • Centrifugal Heavy Duty Pumps
  • Centrifugal API Process Pumps
  • Centrifugal General Purpose Pumps
  • Positive Displacement Pumps

Industrial Application

Oil & Gas Production
Petroleum Refining
Pulp & Paper
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