Nuclear Valves: A Main Steam Relief Isolation Valve Ships for an HPR1000 Unit
A main steam relief isolation valve developed jointly by a Chinese utility's engineering arm and a Dalian valve maker has shipped to an HPR1000 unit, with design figures of 8.9 MPa and 316 °C.
Lead
A main steam relief isolation valve for the HPR1000 reactor design has shipped to a Chinese nuclear power unit, according to Chinese industry and regional press. The valve was developed jointly by China Nuclear Power Engineering Co., Ltd (CNPEC) and Dalian Dagao Valve Co. (大连大高阀门股份有限公司).
The two reports describe it as the first unit of its type developed in China with independent intellectual property.
Facts
What the valve does. It sits in the steam atmospheric relief system and carries residual-heat removal, overpressure protection and system isolation. (Source: China Industry News (中国工业新闻网), 2026-08-28.)
Who developed it. CNPEC and Dalian Dagao Valve Co. formed a joint team and worked on it for close to three years. The reports list five core technology areas and say the product passed an appraisal organised by the China Machinery Industry Federation. (Sources: China Industry News, 2026-08-28; Northeast News Network (东北新闻网), 2026-03-19.)
Where it went. The first unit shipped on 18 March 2026 to Unit 5 of the Lufeng nuclear power plant. Units 6 and other HPR1000 units are to follow, and each HPR1000 unit takes three valves of this type. (Source: Northeast News Network, 2026-03-19.)
The design figures the source gives. Design pressure 8.9 MPa, design temperature 316 °C (601 °F), design service life 60 years. (Source: Northeast News Network, 2026-03-19.)
What the developer says it changes. China Industry News states that procurement cost falls by 40% against the imported equivalent and that delivery lead time is compressed; it also states that the maker's core products are now in service on more than one hundred nuclear units under construction or in operation in China. (Source: China Industry News, 2026-08-28.)
Note on scope. A nuclear safety-class valve with a gas-hydraulic actuator is not one of the five general valve types this site screens. This item is recorded for the high-parameter isolation duty, not as a recommendation, and it is not certification advice.
Where this connects on this site
- How a duty at 8.9 MPa and 316 °C (601 °F) is resolved in order — function, then class and temperature, then material: Valve Selection Guide: From Function to Class to Material
- Why 316 °C (601 °F) puts the seat rather than the body on the critical path, and what a metal seat costs in tightness: Soft-Seated vs Metal-Seated Valves: Where the Temperature Line Is
- What a seat-leakage class actually permits once the seat is metal: ISO 5208 Rate A: What a Valve Seat-Leakage Class Does and Does Not Promise
- The selector: industrialvalveselect.com
Sources
| # | Fact | Source |
|---|---|---|
| 1 | Joint development by CNPEC and Dalian Dagao Valve Co. (大连大高阀门股份有限公司); close to three years of work; five core technology areas; appraisal organised by the China Machinery Industry Federation; first unit shipped to Lufeng Unit 5, with Unit 6 and other HPR1000 units to follow; procurement cost stated as 40% below the imported equivalent; products in service on more than one hundred Chinese nuclear units | China Industry News (中国工业新闻网) — https://www.cinn.cn/mp/2026/08-28/0X0t4Bqa.html |
| 2 | Shipment on 18 March 2026; design pressure 8.9 MPa; design temperature 316 °C; design service life 60 years; three valves per HPR1000 unit | Northeast News Network (东北新闻网) — https://liaoning.nen.com.cn/network/liaoningnews/lnshizhengnews/2026/03/19/889153976266658200.shtml |
Note on sourcing. Item 1 originates as an industry-press report; item 2 as regional press coverage of the shipment. We report the stated facts — who developed it, what the design figures are, where it went, and what the appraisal was — and we do not repeat performance claims beyond those stated.
What the source does not state
The two reports do not state the valve's nominal size, its pressure class designation, its body, seat or packing materials, the appraisal test programme or its acceptance criteria, or the number of units covered by the appraisal.
Update note
Append-only. Corrections marked Correction with date.