| Technical Specifications | Product Scope |
|---|---|
| Product family | Full-lift boiler steam safety valves |
| Size Range | DN15-DN400; configuration-specific |
| Pressure Rating | Class150-4500SPL; model-specific |
| Selected series | PAT-7432F / PAT-748F and related PAT configurations |
| Service | Boiler, superheater and reheater steam protection |
| Materials | F92, F91, F22, A105 and other service-specific grades |
| Selection basis | Set pressure; relieving capacity; steam temperature; backpressure; connection and applicable code |
Selected disc designs use controlled thermal deformation to support sealing under changing steam temperatures.
Spring selection and adjustment establish valve opening and blowdown performance for the steam duty.
PAT-7432F examples include DN75 / Class 3500SPL and DN65 / Class 4500SPL arrangements.
PAT-748F examples include DN152 arrangements in Class 900 or Class 1500.
Steam overpressure protection at superheater systems.
Safety-valve service at reheater inlet and outlet systems.
Coordinated set pressures and discharge arrangements for boiler steam protection.
| Project Reference – Generating Units | Selected Specification / Material | Set Pressure (MPa) | Working Temperature (°C) |
|---|---|---|---|
| 2 x 660MW ultra-supercritical | DN75; Class3500SPL; WC9 | 35.26 | 445 |
| 2 x 660MW ultra-supercritical | 6"; Class1500; C12A | 6.76 | 603 |
| 1 x 700MW ultra-supercritical | DN75; Class3500SPL; WC9 | 35.88 | 489 |
Set pressure, opening, blowdown and relieving-capacity requirements define the performance and documentation scope.
Available project documentation can include valve drawings, model-specific datasheets, material records, inspection and test plans, test reports and operating instructions.
