A nuclear plant buys valves in two different worlds. The conventional island — circulating water, feedwater, balance-of-plant steam — is standard industrial duty and the selector answers it directly. The nuclear island is a different discipline: safety-class design, qualification and quality-assurance regimes are project matters that no catalogue tool should pretend to cover.
The box below runs a conventional-island reference duty. For nuclear-island service, use the inquiry channel and the duty goes to manufacturers with the relevant qualifications — the recent awards this site has reported show that market is real and active.
Typical duties
| Circulating water (conventional island) | Seawater/fresh water · 6–16 bar · ambient · DN300–800 |
|---|---|
| Balance-of-plant steam and feedwater | Steam/water · 25–60 bar · 120–260 °C · DN50–300 |
| Nuclear island (safety class) | Outside this tool's scope — engineering review |
25 bar · 120 °C · DN200 on Clean Water (liquid): Ball Valve (floating / trunnion-mounted) · body Carbon steel (ASTM A216 WCB) · Class 300.
bubble-tight quarter-turn isolation is the modern default for this duty
/* r11 P3-6 (user-approved): the duty-specific caution (e.g. class utilisation) belongs ON the page, not only in the unlocked report — the last boilerplate line stays report-only */Watch: Pressure-temperature ratings are screening values from published ASME B16.34 tables; flange standard, face-to-face dimension, fugitive-emission class and actuation sizing are all stated for the manufacturer to confirm, not decided here.
What to watch
- Conventional-island duties answer like any water or steam duty — same KB, same class tables.
- Safety-class valves (Class 1/2/3) involve design qualification and QA documentation this tool does not model.
- Chinese nuclear projects are a live market — see the reported awards linked below for the shape of recent packages.
Where this connects on this site
- Reported: main-steam relief and isolation valves for an HPR1000 project
- Reported: a nuclear gate-valve package at the Xiapu HPR1000 project
- Gate valves — the nuclear-package mainstay
- Globe valves — the regulation side
Boundary rule: this page states single-point conclusions from the site's knowledge base — no supplier names, no matrices. The full 40-medium library lives in the selector.