Flowserve’s D Series seals are based on the UC Series, that are a balanced pusher seal with a pumping ring built into the rotating seal face body that establishes an exclusive Plan 23 cooling chamber around the seal faces. Flowserve’s D Series excel in high temperature boiler feed water and hot hydrocarbon services.
Based on Flowserve’s UC Series are a balanced pusher seals with a substantial single coil spring that provides exceptional performance in the most demanding services including refineries, pipeline and petrochemicals services. UC seals are fully compliant with API 682, Type A requirements.
Features
- Rotating seal face body integrates a pumping ring to maximize circulation flow through a Plan 23 Seal cooler and return the flow directly at the seal interface, eliminating the expense of cool injection systems.
- Tungsten Carbide rotating face is mounted and driven in an optimal, low stress configuration to remain flat under all operating conditions for very low leakage performance.
- Large, low spring rate single coil spring tolerates axial setting variations common to high temperature pumps.
- Robust U-cup seal flexibly mounts the rotating seal face while compensating for minor misalignment of the shaft and maintaining consistent seal face contact.
- Spring holder enables a strong drive linkage from the sleeve to the seal face while isolating the spring from torque.
- Seal installation is simplifies with cartridge seal assembly or, as special equipment requirements demand, the seal can be installed by components.
Operating Parameters
| Pressure | D: Up to 1000 psi (69.0 bar) DP: Up to 1500 psi (103.4 bar) |
| Temperature | -100 to 650°F (-73 to 343°C) |
| Specific Gravity | 0.45 and higher |
| Shaft Speed | up to 75 fps (23 m/s) |
| Shaft Size | 0.525 to 5.400 inch (13.3 to 137.2 mm) |
Materials of Construction
| Metal Components | 316 Stainless Steel |
| Rotating Face | Silicon Carbide, Tungsten Carbide |
| Stationary Face | Carbon |
| Gaskets | Fluoroelastomer, Perfluoro-elastomer, Nitrile, EPDM |
| Spring | 316 Stainless Steel |
Industrial Applications
- Oil & Gas
- Midstream Transportations
- Downstream Processing
- Power
- Conventional Steam
- Biomass & MSW
- Processing Units
- Hydrotreating
- Hydrocracking
- Catalytic Cracking
- Delayed Coking
- Alkylation
- Boiler & Steam Systems
- Boiler Circulation Systems
- Boiler Feedwater Systems
- Steam Systems
- Water Management
- Water Handling & Treatment
- Water Injection
- Condensate Systems
- Pipeline & Transportation
- Crude Pipeline
- Products Pipeline
- Logistics and Tank Farm
- Cooling Systems
- Cooling Systems
- Heavy Oil & Upgrading
- Miscellaneous Services
- Distillation
- SAGD (Steam-Assisted-Gravity-Damage)
Specialized designs for specific applications
| DQ | High balance face satisfies low hydrocarbon emissions levels |
| DP | Custom designed stationary face for high pressure services up to 1500 psi (103.4 bar) |
| DZ | Shot axial length design for short seal chambers |
