Disc, seat & operation
Review disc and seat materials, pipe clearance and the end connection. Specify manual or actuated operation and any position-feedback requirements.
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| Position | Normally Open · Normally Closed |
|---|---|
| Available Sizes | DN50-DN300 |
| Connection Type | Wafer |
| Pressure Rating | 300PSI |
| Body Material | Ductile Iron |
| Disc Material | EPDM Encapsulated Ductile Iron |
| Working Temperature | -10 - 120°C |
| Size | DN50 · DN65 · DN80 · DN100 · DN125 · DN150 · DN200 · DN250 · DN300 |
| Approvals | FM |
Catalogue options. Operating limits depend on the selected size, materials and configuration.
NSBU-W gear-operated butterfly valve with wafer mounting between mating flanges, an EPDM-encapsulated ductile iron disc and electrical valve-position supervision. Available in DN50-DN300 for fire protection and sprinkler water systems; the catalogue configuration is 300 PSI.
Applications: Fire protection
For technical documentation or assistance with your selection, contact Nordic Valves.
NSBU-W gear-operated butterfly valve with wafer mounting between mating flanges, an EPDM-encapsulated ductile iron disc and electrical valve-position supervision. Available in DN50-DN300 for fire protection and sprinkler water systems; the catalogue configuration is 300 PSI.
FM Certificate of Compliance: FM 1112. Approval identification PR468420, granted 1 March 2024.
| Component | Material | Specification |
|---|---|---|
| Body | Ductile iron | ASTM A536 |
| Disc | EPDM fully encapsulated ductile iron | ASTM A536 + EPDM |
| Upper / lower shaft | Stainless steel | SS410 |
| O-ring | EPDM | - |
| Bushing | Bronze | ASTM B150M C63000 |
| Gland, washer and plug | Galvanized carbon steel | Surface passivation |
| Gearbox housing | Ductile iron | ASTM A536 |
| Gearbox fasteners | Galvanized carbon steel | Surface passivation |
Materials transcribed from the connection-specific NSBU datasheet. View the source drawing and table.
| Size | A (mm) | B (mm) | L (mm) | E (mm) | H (mm) |
|---|---|---|---|---|---|
| DN50 | 140.5 | 72 | 43 | 125 | 258.6 |
| DN65 | 152.5 | 78 | 46 | 125 | 270.6 |
| DN80 | 157.5 | 85 | 46 | 125 | 275.6 |
| DN100 | 176 | 105 | 52 | 125 | 294 |
| DN125 | 191 | 128 | 56 | 140 | 312 |
| DN150 | 202.5 | 140 | 56 | 140 | 322.6 |
| DN200 | 243.5 | 170 | 62 | 159 | 345.5 |
| DN250 | 273 | 205 | 68 | 159 | 401 |
| DN300 | 311 | 258 | 78 | 228 | 437 |
Dimension symbols match the drawing in the linked datasheet; verify the mating flange before ordering. View the source drawing and table.
Supervised isolation, check valves and sprinkler heads. Match the component to the system specification.
Explore application guidanceReview disc and seat materials, pipe clearance and the end connection. Specify manual or actuated operation and any position-feedback requirements.
Specify the system pressure, installation position and connection. Confirm the supervision arrangement where applicable and the product approvals required by the project.
Include the required installation drawing, material documentation and testing requirements. Confirm the final configuration and its operating limits with your enquiry.
Include the operating conditions in your enquiry. Add your medium, pressure, temperature and documentation requirements alongside the selected options.
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