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Flowserve-Flowserve-OEM and Special Duty Seals - Circpac MD Circumferential Bushing

OEM and Special Duty Seals - Circpac MD Circumferential Bushing

BRAND: Flowserve

Circpac MD seals are a segmented circumferential seal designed for fans, blowers, dryers, turbines, centrifuges and other rotating equipment. Circpac MD seals come packaged in a convenient split housing for easy installation. Standard designs consistently outperform packing, bushings, labyrinths, and felt seals with lower gas consumption over a wider range of operating conditions.


  • Oil & Gas
  • Water
  • General Industry

industry sectors

  • Downstream Processing
  • Waste Water
  • Steel & Primary Metals
Operating Parameters

Pressure: vacuum to 6.9 bar (100 psi)

Temperature: -40 to 593°C (-40 to 1100°F)

Speed: up to: 46 m/s (150 fps)

Sizes: 35 to 457 mm (1.375 to 18.000 inches)

Features & Benefits
  • Floating circumferential rings are hydraulically balanced with hydrodynamic surface topography to minimize wear at high speeds and pressures
  • Standard radially split seal housing enables installation without dismantling equipment or requiring equipment modifications
  • Multiple ring configurations are available for higher pressures, process venting or draining, inert gas purging, reduced emissions, and emergency backup
  • Companion inert gas support panels are available to provide adequate flow and pressure of nitrogen or other barrier gases to achieve near zero emissions

Single ring
Low pressures

Tandem rings
Process vent or drain

Double rings
Inert barrier gas injection

Triple rings
Inert barrier gas injection
Lower barrier gas consumption rate

Quadruple rings
High pressure
Multiple vent, drain, or barrier gas injection ports


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