Mechanical Seals

Style 78

Tandem Rotating Welded Metal Bellows Cartridge with Pumping Ring

Cartridges for the critical, toxic and fugitive emission applications where single seals are not acceptable.
Easy to install cartridge designs.
Incorporated pumping ring improves cooling of barrier fluid.
A tangential connection maximizes flow of barrier fluid.
Can be operated in pressurized or non-pressurized state.
Static O-rings throughout
Self-cleaning bellows action
Fits all ANSI standard and big bore pumps.
Metric sizes are available.
Retained faces eliminate troublesome drive pins.
Tandem design maintains product and barrier fluid on O.D. of both seals for increased safety and heat dissipation.
Hydraulically balanced design.
Double Ply available for higher pressure.
Shrouded face design for added protection.
API 682 Type B low temperature and Type C high temperature. Tandem Arrangement 2 and 3 available.

Operating Conditions

Max Temp - 400ºF (204ºC)
Max Speed - 4500FPM (22 m/sec)

Max Pressure
Inboard - 300 PSI (20 bar)
Outboard - 250 PSI (17 bar)

Style 76

Tandem Rotating Welded Bellows Cartridge

Cost effective version of Style 78, designed for applications in which pumping ring or tangential connection are not required.

Operating Conditions

Max Temp - 400ºF (204ºC)
Max Speed - 4500FPM (22 m/sec)

Max Pressure
Inboard - 300 PSI (20 bar)
Outboard - 250 PSI (17 bar)
Differential Pressure - 15-25 PSIG recommended.
Higher pressure is available consult Flex-A-Seal.