Mechaflex R.S.T. P838

Robust Single Cartridge Seal

The P838 series is a heavy duty single cartridge seal intended to provide an excellent sealing performance for pumps. As one of the members of RST Mechanical Seals, P838 is designed to operate in a wide range of process fluids. P838 particularly exhibits high performance in the operation of critical process fluids of hydrocarbon, boiler feed water, sour gas, propane and butane, non-flashing hydrocarbon and flashing hydrocarbon

The improvements in design reliability and robustness are made possible by the utilization 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 310 C / - 40 F to + 590 F
Up to 21 bar g/300 psig
Up to 170 bar / 2540 psig

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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