| Technical Specifications | Product Scope |
|---|---|
| Product family | HP heater inlet / outlet three-way bypass valves |
| Size Range | DN150-DN600; series-specific |
| Pressure Rating | Class1500-3000; series-specific |
| Selected series | J764Y / H761Y and related configurations |
| Body example | WB36 integral forged construction |
| Actuation | Hydraulic / electric, depending on design |
| Selection basis | Feedwater pressure / temperature; inlet / outlet arrangement; bypass duty; protection logic |
WB36 designs use integral forgings for demanding high-pressure feedwater service.
Hydraulic operation and internal throttling are integrated with the selected flow-routing arrangement.
Engineered piston and seat sealing work with mechanical locking provisions in the designs.
J764Y inlet and H761Y outlet configurations form coordinated heater isolation and bypass arrangements.
Feedwater flow routing at the heater inlet.
Outlet isolation coordinated with the inlet and bypass arrangement.
Feedwater routing during normal operation, heater upsets and bypass operation.
| Project Reference – Generating Units | Selected Specification / Material | Design Pressure (MPa) | Design Temperature (°C) |
|---|---|---|---|
| 2 x 1000MW ultra-supercritical | DN350; PN420; WB36 | 39 | 300 |
| 2 x 660MW ultra-supercritical | DN400; PN450; WB36 | 39.56 | 310 |
| 3 x 145MW supercritical | DN225; Class2100SPL; WB36 | 35 | 295 |
Inlet, outlet and bypass operation, hydraulic actuation and locking functions define the operating checks.
Pressure and leakage testing cover the selected valve pressure boundary and sealing arrangement.
Available project documentation can include valve drawings, model-specific datasheets, material records, inspection and test plans, test reports and operating instructions.
