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Single Stationary Multi-Spring Cartridge Mechanical Seal with Circulation Gland

Mechanical Seal Style SMS1

Strategic versatility

With common sleeves, glands, and seal parts for all designs, cartridge assembly is quick and fail-safe. Plus, it's easy to modify face material, metallurgy and elastomers. 

Single Stationary Multi-Spring Cartridge Mechanical Seal with Circulation Gland - Style SMS1


  • Part of Flexaseal’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 Specialised Seals if in doubt.

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