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Flowserve-Flowserve-Pusher Seals - U/D

Pusher Seals - U/D Series

BRAND: Flowserve

UC Series seals are balanced pusher seals with a substantial single coil spring that provides exceptional performance in the most demanding services including refineries, pipelines, and petrochemical services. UC seals are fully compliant with API 682, Type A requirements.

D Series seals are based on the UC Series, and add a pumping ring built into the rotating seal face body that establishes an exclusive Plan 23 cooling chamber around the seal faces. D Series seals excel in high temperature boiler feed water and hot hydrocarbon services.

Industries

  • Power
  • Oil & Gas

industry sectors

  • Nuclear
  • Conventional Steam
  • Biomass and MSW
  • Midstream Transportation
  • Downstream Processing
Standards

API 682

Operating Parameters

Pressure:

  • UC: up to 27.6 bar (400 psi)
  • UO and D: up to 68.9 bar (1000 psi)
  • UOP and DP: up to 103.4 bar (1500 psi)

Temperature:

  • U Series: -40 to 204°C (-40 to 400°F)
  • D Series: -73 to 343°C (-100 to 650°F)

Speed: up to: 23 m/s (75 fps)

Sizes: 14.1 to 148 mm (0.566 to 5.838 inch)

Features & Benefits
  • Extended service life in heavy-duty services assured by rugged single pusher seal with thick cross section components
  • Increased reliability via large, low spring rate single coil spring that tolerates axial setting dimensions while reducing opportunity for clogging and hang-up from solids
  • Consistent seal face contact provided by robust U-cup seal and spring holder
  • Low-emissions performance enabled by silicon carbide rotating face mounted on graphite ring in UC and UCQ seals, preventing shrink fit distortions and sustaining a flat seal face
  • High pressure performance in UO, UOP, D, and DP seals enabled by silicon carbide rotating face mounted on O-ring, preventing shrink fit distortions and sustaining a flat seal face
  • Cost-effective operation ensured by integrated pumping ring in D and DP seals that establishes an exclusive Plan 23 cooling chamber around the seal faces and eliminates the expense of cool injection systems
Configurations

Arrangement 1 single seal (Common Piping Plans 11, 13, 32, 62)

UC
UCQ
UO
UOP

Arrangement 1 single seal (Common Piping Plan 23)

D
DP

Arrangement 2 unpressurized dual seal with dry running backup (Common Piping Plans 72, 75, 76)

UCQ/GSL
UOP/GSL

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