Duplex Strainer -- Twin Basket 3-Way Diverter WCB
Continuous Inline Filtration with Zero-Flow-Interruption Changeover
Document No.SV-DS-STR-002
RevisionRev A
DateMay 2026
ManufacturerSupreme Valves India, Ahmedabad, Gujarat, India
This datasheet describes duplex basket strainers with twin chambers and 3-way diverter plug for continuous pipeline filtration where shutdown for basket cleaning is not acceptable.
Technical Specifications
| Parameter | Specification |
|---|
| Valve Size Range | DN50 to DN300 (2" to 12") |
| Pressure Rating | PN16 / PN40 / Class 150 / Class 300 |
| Body Material | WCB carbon steel, CF8 (SS304), CF8M (SS316) |
| Basket Material | SS304 or SS316 perforated or mesh-lined |
| Diverter Plug Material | WCB or SS316, 3-way plug with lapped seats |
| Perforation | 1.5 mm, 3 mm, 6 mm standard |
| Mesh Option | 20 to 100 mesh SS316 wire mesh |
| Temperature Range | -29°C to +425°C (WCB) |
| End Connections | Flanged ASME B16.5 / BS EN 1092-1 |
| Changeover | Manual lever or gear operator; pneumatic / electric actuator optional |
| Interlock | Optional mechanical interlock prevents simultaneous isolation of both baskets |
Materials of Construction
| Component | Material |
|---|
| Body | WCB carbon steel, one-piece casting with two parallel basket chambers |
| Diverter Plug | WCB or SS316, 3-way taper plug with lapped seat surfaces and MoS2 lubrication |
| Basket | SS304 or SS316 perforated cylinder with mesh overlay and top/bottom reinforcing rings |
| Cover | Bolted flat cover per chamber, quick-opening clamp optional for frequent cleaning |
| Gasket | Spiral-wound SS316 + graphite for body/cover joints |
| Bearings | Oil-impregnated bronze sleeve bearings for plug trunnion support |
| Drain | 1/2" NPT drain plug per chamber with SS316 ball valve option |
Testing & Inspection
| Test | Requirement |
|---|
| Test Standard | API 598 / ISO 5208 |
| Certification | CE, ISO 9001 |
Applicable Standards
| Standard | Description |
|---|
| Design Standard | ASME B16.34 / BS EN 12516 |
Notes
- Diverter plug must be operated only when differential pressure across active basket is at least 0.5 bar to ensure seat lubrication.
- Mechanical interlock is highly recommended for unattended or remote installations to prevent dual-isolation human error.
- Basket chambers are not pressure-balanced during changeover; brief transient pressure spike of <0.3 bar is normal.
- For viscous fluids (>500 cSt), specify heated jacketed body or steam tracing to prevent solidification during standby.
- Automated changeover actuator must include torque-limiting clutch to prevent plug damage if debris jams the diverter.
