NB/T 47044
电站阀门 - Power Station Valves
Power station valves built to Chinese standards
What it covers
- Design, materials, manufacture and inspection of power station valves
- GB material grades and their application by temperature
- Test and acceptance requirements for Chinese-standard projects
- Marking and documentation requirements
What it does not cover
- ASME jurisdiction. A valve to NB/T 47044 is not automatically acceptable on an ASME project and vice versa.
- Exact equivalence with ASTM material grades - the equivalences are approximate and need to be confirmed case by case
This section exists because standards are routinely listed on valve datasheets in positions where they do not apply. Knowing the boundary is what makes the reference useful.
When this standard applies
Projects designed and built to Chinese standards - most domestic Chinese power and coal chemical projects, and export projects where the EPC is Chinese and the client has accepted GB/NB design. If your project is ASME-based, this standard is not the design basis, and a supplier offering NB/T 47044 compliance against an ASME specification is not answering the question.
Material equivalence is approximate
GB grades have ASTM near-equivalents, but "near" is doing real work in that sentence. Chemical composition ranges and mechanical property requirements differ, sometimes in ways that matter at temperature. Where a project needs a GB grade accepted against an ASTM specification or the reverse, that should be an explicit technical query, not an assumption on a datasheet.
How we handle dual-standard projects
We state the design standard applied per item. Where a client asks for equivalence between GB and ASTM grades, we provide the comparison with the differences identified, rather than a table implying the grades are interchangeable.
Products this applies to
Verify it yourself
We summarise what the standard governs. We do not reproduce its content - it is copyrighted and you should work from the current edition, not from a supplier's summary.
National Energy Administration, China (NB) - official source
If anything on this page conflicts with the current edition of the standard, the standard is right and this page is wrong. Tell us and we will correct it.