Mechanical Seal Style SMS1

Single Stationary Multi-Spring Cartridge with Circulation Gland

Mechanical Seal Style SMS1


  • Part of Flex-A-Seal’s integrated/platform single cartridge seal design
  • Patented (Patent Number US 7,979,986) Plunger-Lock drive
  • Industry’s leading economical single stationary cartridge design
  • Homogeneous monolithic seal ring
  • Drive mechanisms located out of product, minimizing corrosion and stress-related failure
  • Unique shrouded rotary for maximum face protection and reliable startup
  • Uniform 360 degree transfer of torque to rotating face
  • Seal faces positioned in gland for maximum protection
  • Dynamic elastomer moves on nonmetallic surface eliminating fretting
  • Faces designed for optimum heat dissipation
  • Sleeve is isolated from product
  • Hydraulically balanced
  • Easy cartridge installation
  • Flush position maximizes face cooling
  • Metric sizes available

SMS3 with Circulation, Vent & Drain Gland

  • All the benefits of the SMS1 design plus vent and drain gland with throttle bushing
  • Pipe connections are made to different sizes to assure that correct piping plans are employed
  • Cost-effective upgrade


Operating Conditions

Max Temp:400°F (204°C)
Max Pressure:300 PSI (20 bar)
Max Speed:6000 FPM (30 m/sec)

Note: Max Temperature / pressure / speed indicate operating extremes independently and do not imply the seal will function at these extremes at the same time. Contact Flex-A-Seal if in doubt.


For more information on the SMS1


Depending on your specific needs and application, Flex-A-Seal can help you identify the ideal products. Contact us to tell us about your needs and request a quote.