Nitto Seiko Type BF
| Nominal size symbol | 20 |
| Volume symbol | A |
| Measured fluid | Cold water & Hot water |
| Nominal size | 20A |
| Liquid viscosity | Viscosity equivalent to 1 mPa･s |
| Liquid temperature | General: 110celcius or Less |
| High temperature: 110~200celcius | |
| Liquid pressure | 2.0 MPa or less |
| Accuracy | Within ±1% |
| Standard Connection | Flange |
| Nominal size symbol | 25 |
| Volume symbol | A, B |
| Measured fluid | Cold water & Hot water |
| Nominal size | 25A |
| Liquid viscosity | Viscosity equivalent to 1 mPa･s |
| Liquid temperature | General: 110celcius or Less |
| High temperature: 110~200celcius | |
| Liquid pressure | 2.0 MPa or less |
| Accuracy | Within ±1% |
| Standard Connection | Flange |
| Nominal size symbol | 40 |
| Volume symbol | A, B |
| Measured fluid | Cold water & Hot water |
| Nominal size | 40A |
| Liquid viscosity | Viscosity equivalent to 1 mPa･s |
| Liquid temperature | General: 110celcius or Less |
| High temperature: 110~200celcius | |
| Liquid pressure | 2.0 MPa or less |
| Accuracy | Within ±1% |
| Standard Connection | Flange |
| Nominal size symbol | 50 |
| Volume symbol | A, B |
| Measured fluid | Cold water & Hot water |
| Nominal size | 50A |
| Liquid viscosity | Viscosity equivalent to 1 mPa･s |
| Liquid temperature | General: 110celcius or Less |
| High temperature: 110~200celcius | |
| Liquid pressure | 2.0 MPa or less |
| Accuracy | Within ±1% |
| Standard Connection | Flange |