U/D Series Pusher Seal

The UC Series seals are balanced pusher seals with a massive single coil spring that give great performance in the most demanding applications such as refineries, pipelines and petrochemicals. UC seals fully comply with API 682, Type A standards.

The U/D Series Pusher Seal are based on the UC Series and include a pumping ring incorporated into the rotating seal face body, which creates a distinctive Plan 23 cooling chamber around the seal faces. U/D Series Pusher Seal excel in high-temperature boiler feed water and hot hydrocarbon applications.

U/D Series Pusher Seal Applications

Benefit

• Prolonged support durability in demanding applications is guaranteed by a sturdy, one-pusher seal that uses components with a thick cross-section.
• A large, low-spring-rate single coil spring can accommodate axial setting dimensions and reduces the likelihood of particulates clogging and hanging up the spring, resulting in increased reliability.
• The strong U-cup seal and spring support ensure sustained seal face contact.
• A silicon carbide revolving face on a graphite ring in UC and UCQ seals enables low-emissions performance. This maintains the seal’s face flat and prevents shrink fit deformities.
• The silicon carbide spinning face of the O-ring provides high pressure performance in UO, UOP, D and DP seals. This maintains the seal’s face flat and prevents shrink fit deformities.
• The combined pumping ring in D and DP seals forms a unique Plan 23 cooling chamber around the seal faces, saving money by eliminating the requirement for cold injection systems.

Specification

API 682

Temperature:

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

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)

Speed: up to: 23 m/s (75 fps)

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

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

Related Industries

• Oil & Gas
  • Midstream Transportation
  • Downstream Processing
•  Power
  • Nuclear
  • Conventional Steam
  • Biomass & MSW

Mechanical Seal Quick Ship Flyer

Seals Designed for All Fluid Management Challenges Brochure

UC Series Seal Brochure

Upgrade your sealing solutions with the U/D Series Pusher Seal. Contact us today to explore how it can enhance performance.