Mechanical Seal Style SB

Single Stationary Welded Metal Bellows Cartridge with Circulation Gland

Mechanical Seal Style SB


  • Part of Flexaseal’s integrated/platform single cartridge seal design;
  • Patented (Patent Number US 7,979,986) Plunger-Lock drive;
  • Easy cartridge installation;
  • Sleeve is isolated from product;
  • Stationary bellows design – maximizes face alignment;
  • Hydraulically balanced design;
  • Even face loading;
  • No dynamic elastomers;
  • Only two static O-rings – cost savings are substantial when perfluorelastomer are required;
  • Flush position maximizes face cooling;
  • Shrouded rotary seal ring for maximum face protection and reliable start-up;
  • Uniform 360° transfer of torque to the primary rotating face;
  • No pins to break or hang up;
  • Fits ANSI standard and big bore pumps;
  • Faces, metallurgies and elastomers are easily upgradeable;
  • Faces designed for optimum heat dissipation;
  • Metric sizes are available.

SB3 with Circulation, Vent & Drain Gland

  • All the benefits of the SB 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 Parameters

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 Flexaseal Engineered Seals and Systems, LLC if in doubt.


For more information on the SB

Quote Request

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