Wafer and lug / single-flange
Compact body configurations are catalog-listed across selected size ranges. Confirm flange compatibility, face-to-face, shaft interface and allowable differential pressure.
Offset butterfly valve range
High-Performance Butterfly Valves
Offset soft-seat and metal-seat configurations for ASME Class 150 and Class 300 projects, available with wafer, lug and flanged body options.
Design intent
Offset geometry separates sealing contact from most of the opening stroke
The offset disc-and-shaft arrangement reduces sealing contact through most of the opening stroke. Replaceable seat construction, an anti-blowout stem detail and direct actuator mounting support industrial isolation and control packages.
- SSoft-seat configurations
RPTFE or PPL seats are available with selected carbon- or stainless-steel body combinations.
- MMetal-seat option
Metal-seat configurations use their own geometry and material set for higher-demand project conditions.
- AActuation routes
Manual, worm-gear, pneumatic and electric packages are listed, subject to torque and interface review.
Model range
Model, pressure class and size coverage
Choose the model family by connection style, pressure class, size and material combination.
| Catalog model / table | Pressure class | Published dimensional range |
|---|---|---|
| DBA8150 wafer | Class 150 | DN50-DN1000 |
| DBA8300 wafer | Class 300 | DN50-DN600 |
| DBA5150 single-flange | Class 150 | DN65-DN1500 |
| DBA5300 single-flange | Class 300 | DN80-DN600 |
| DBA4150 double-flange | Class 150 | DN80-DN800 |
| Metal-seat dimensional table | Confirm by connection | DN80-DN600 |
Product range
High-performance valve selection data
Availability is confirmed by model, pressure class, connection, material combination and actuation.
| Product configurations | Offset soft-seat and metal-seat butterfly valve optionsThe metal-seat section uses conflicting double- and triple-offset terminology. Confirm the geometry on the approved drawing. | Range |
|---|---|---|
| Published size coverage | Selected configurations DN50–DN1500; metal-seat dimensional tables DN80–DN600Availability varies by pressure class, connection and model. | Range |
| Published pressure tables | ASME Class 150 and Class 300Confirm pressure class, connection and dimensional table for the selected model. | Range |
| Connection options | Wafer, lug / single-flange and double-flange catalog configurations | Range |
| Operator routes | Bare stem, manual, worm gear, pneumatic and electric; hydraulic is listed for selected metal-seat configurations | Range |
| Common body references | ASTM A216 WCB, CF8 or CF8M in selected catalog material combinationsConfirm the bill of materials for the requested model and service. | Range |
| Common trim references | CF8M disc, 17-4PH shaft and RPTFE or PPL soft-seat options in selected combinationsMetal-seat construction uses a separate bill of materials. | Range |
Connection & class
Use the project flange standard to narrow the model
The principal configurations cover ASME Class 150 and Class 300.
Double-flange configurations
Flanged configurations have their own size and dimension tables. Request the exact drawing rather than substituting dimensions between model families.
Standards
Design and inspection references
State the required design, inspection, flange and fire-test standards in the project specification.
| Design reference | API 609 | Standard |
|---|---|---|
| Inspection reference | API 598 | Standard |
| Face-to-face / flange references | ASME and MSS references listed by configuration | Standard |
| Fire-test requirement | API 607 may be specified where applicable; confirm with the selected configuration | Standard |
Selection support
Match the pressure class and construction to the duty.
Include the pressure class, nominal size, flange arrangement, medium, temperature, differential pressure, shutoff requirement, actuation and project test specification.