Description
API 6D / BS 1868 Flanged Swing Check Valve
The WDL Valve API 6D swing check valve is designed to allow flow in one direction and automatically prevent reverse flow when the upstream pressure decreases. It protects pumps, compressors and other pipeline equipment from backflow and pressure reversal.
The valve features a swing-type disc and a straight-through flow passage for low flow resistance. Depending on the selected design and flow direction, it can be installed in horizontal piping or vertical piping with upward flow.
Design Features
- Swing-type disc provides automatic non-return operation.
- Straight-through flow passage helps reduce pressure loss.
- Internal hinge pin construction reduces potential external leakage points.
- Bolted cover construction provides convenient inspection and maintenance.
- Pressure-seal cover construction is available for Class 900 and higher-pressure configurations.
- Renewable or welded seat surfaces are available according to material and service requirements.
- RF, RTJ and butt-weld end connections can be supplied.
- Carbon steel, stainless steel and special-alloy materials are available.
Applicable Standards
| Item | Applicable Standard |
|---|
| Design and Manufacture | API 6D, BS 1868 and ASME B16.34 |
| Face-to-Face Dimensions | ASME B16.10 |
| Flange Dimensions | ASME B16.5 / ASME B16.47 where applicable |
| Butt-Weld Ends | ASME B16.25 |
| Pressure-Temperature Rating | ASME B16.34 |
| Inspection and Testing | API 598 |
Pressure Test Data
| Pressure Class | Shell Test | Water Seat Test | Air Seat Test |
|---|
| MPa | psi | MPa | psi | MPa | psi |
|---|
| Class 150 | 3.1 | 450 | 2.2 | 315 | 0.5–0.7 | 60–100 |
| Class 300 | 7.8 | 1125 | 5.6 | 815 |
| Class 600 | 15.3 | 2225 | 11.2 | 1630 |
| Class 900 | 23.1 | 3350 | 16.8 | 2440 |
Available Materials
| Component | Available Materials |
|---|
| Body and Cover | ASTM A216 WCB, ASTM A351 CF8, CF8M, CF3 and CF3M |
| Disc and Hinge | WCB, CF8, CF8M, CF3, CF3M or Monel |
| Hinge Pin | F6a, F304, F304L, F316, F316L or Monel |
| Disc Seating Surface | 13Cr, 304, 304L, 316, 316L, Stellite or Monel |
| Body Seat Surface | 13Cr, 304, 304L, 316, 316L, Stellite or Monel |
The final body, trim and seating materials should be selected according to the medium, chloride concentration, operating temperature, pressure and corrosion conditions.
Class 150 Main Dimensions
| NPS | 2″ | 2-1/2″ | 3″ | 4″ | 5″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ |
|---|
| DN | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 |
|---|
| L (mm) | 203 | 216 | 241 | 292 | 330 | 356 | 495 | 622 | 699 | 787 | 864 | 978 | 978 | 1275 |
|---|
| H (mm) | 142 | 166 | 178 | 236 | 252 | 266 | 314 | 368 | 429 | 455 | 410 | 560 | 600 | 880 |
|---|
Class 300 Main Dimensions
| NPS | 2″ | 2-1/2″ | 3″ | 4″ | 5″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ |
|---|
| DN | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 |
|---|
| L (mm) | 267 | 292 | 318 | 356 | 400 | 444 | 533 | 622 | 711 | 838 | 864 | 978 | 1016 | 1346 |
|---|
| H (mm) | 165 | 185 | 205 | 228 | 250 | 275 | 325 | 378 | 410 | 480 | 530 | 575 | 630 | 860 |
|---|
Class 400 Main Dimensions
| NPS | 2″ | 2-1/2″ | 3″ | 4″ | 5″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ |
|---|
| DN | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 |
|---|
| L (mm) | 292 | 330 | 356 | 406 | 457 | 495 | 597 | 673 | 762 | 889 | 902 | 1016 | 1054 |
|---|
| H (mm) | 190 | 203 | 229 | 267 | 292 | 330 | 381 | 406 | 457 | 528 | 546 | 597 | 635 |
|---|
Class 600 Main Dimensions
| NPS | 2″ | 2-1/2″ | 3″ | 4″ | 5″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ | 18″ | 20″ | 24″ |
|---|
| DN | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 | 450 | 500 | 600 |
|---|
| L (mm) | 292 | 330 | 356 | 432 | 508 | 559 | 660 | 787 | 838 | 889 | 991 | 1092 | 1194 | 1397 |
|---|
| H (mm) | 203 | 229 | 235 | 286 | 292 | 330 | 381 | 457 | 584 | 835 | 684 | 752 | 975 | 1111 |
|---|
Class 900 Main Dimensions
| NPS | 2″ | 2-1/2″ | 3″ | 4″ | 5″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ |
|---|
| DN | 50 | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 |
|---|
| L (mm) | 368 | 419 | 381 | 457 | 559 | 610 | 737 | 838 | 965 | 1029 | 1130 |
|---|
| H (mm) | 216 | 254 | 292 | 318 | 343 | 368 | 432 | 546 | 660 | 782 | 838 |
|---|
Class 1500 Main Dimensions
| NPS | 2-1/2″ | 3″ | 4″ | 5″ | 6″ | 8″ | 10″ | 12″ | 14″ | 16″ |
|---|
| DN | 65 | 80 | 100 | 125 | 150 | 200 | 250 | 300 | 350 | 400 |
|---|
| L (mm) | 419 | 470 | 546 | 673 | 705 | 832 | 991 | 1130 | 1257 | 1384 |
|---|
| H (mm) | 193 | 246 | 288 | 324 | 373 | 466 | 536 | 857 | 950 | 1020 |
|---|
Dimension tables are for preliminary product selection. Final dimensions may vary with flange facing, end connection, body material, pressure-seal construction and customer requirements. Always refer to the approved WDL Valve drawing.
Typical Applications
- Oil and natural gas transmission pipelines
- Petroleum refining and petrochemical processing
- Chemical and fertilizer plants
- Power generation and steam systems
- Water treatment and industrial water systems
- Marine and offshore piping systems
- High-pressure and high-temperature process lines
Ordering Information
When requesting a quotation, please provide the nominal size, pressure class, body material, trim material, flange facing, service medium, operating pressure, operating temperature and required inspection documents.
WDL Valve can supply material certificates, dimensional drawings and pressure test reports according to the agreed order requirements.
Reviews
There are no reviews yet.