Flowserve U/D Series Pusher Seal

Product Brand

Flowserve

Type

Mechanical Seals

SubType

Pusher Seals

About this product

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.

Features and Benefitss

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

Specifications

API 682

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)

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

Industries

Power

Nuclear
Conventional Steam
Biomass & MSW

Oil & Gas

Midstream Transportation
Downstream Processing