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EXECUTIVE SUMMARY
This report covers industrial-process control valves — specifically flow capacity sizing equations. GB/T 17213.2-2017 is IDT (identical) to IEC 60534-2-1:2011 with zero technical deviations. Procurement implication: no additional testing or modification required for cross-border use.
APPLICABLE CHINESE STANDARDS
| Standard No. | Title (Chinese) | Scope | Mandatory/Recommended | Status |
|---|---|---|---|---|
| GB/T 17213.2-2017 | 工业过程控制阀 第2-1部分：流通能力 安装条件下流体流量的计算公式 (Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions) | Defines sizing equations for liquid, gas, steam, two-phase flow | Recommended (GB/T) | Current |
| GB/T 17213.1-2015 | 工业过程控制阀 第1部分：控制阀术语和总则 (Industrial-process control valves - Part 1: Terminology and general principles) | Terminology and general principles | Recommended | Current |
| GB/T 17213.9-2005 | 工业过程控制阀 第2-3部分：流通能力 试验程序 (Industrial-process control valves - Part 2-3: Flow capacity - Test procedures) | Test procedures for flow capacity | Recommended | Current |
STANDARD TIER CLASSIFICATION
| Standard | Tier | Description |
|---|---|---|
| GB/T 17213.2-2017 | TIER 2 — Calculation Method | Defines equations for sizing control valves |
| IEC 60534-2-1:2011 | TIER 2 — Calculation Method | Identical scope — both are calculation standards, not product specifications |
SCOPE BREAKDOWN
Control valves — Flow capacity sizing equations
Chinese standard: GB/T 17213.2-2017: 工业过程控制阀 第2-1部分：流通能力 安装条件下流体流量的计算公式 (Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions)
International equivalent: IEC 60534-2-1:2011: Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions
Equivalence: IDT
Standard tier match: Both TIER 2 — valid comparison
| Parameter | Chinese Standard Value (Clause) | International Value (Clause) | Deviation | Mutual Recognition | Procurement Impact |
|---|---|---|---|---|---|
| Scope of equations | Liquid, gas, steam, two-phase flow (§1) | Liquid, gas, steam, two-phase flow (§1) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Flow coefficient definition (Cv) | US gpm water at 60°F, 1 psi ΔP (§3.1.1) | US gpm water at 60°F, 1 psi ΔP (§3.1.1) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Liquid sizing equation | Q = Cv × √((P1-P2)/Gf) (§4.1 Eq.1) | Q = Cv × √((P1-P2)/Gf) (§4.1 Eq.1) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Gas sizing equation | w = Cv × Y × √(x × P1 × ρ1) (§5.1 Eq.5) | w = Cv × Y × √(x × P1 × ρ1) (§5.1 Eq.5) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Pressure differential ratio factor (xT) | xT = f(valve geometry) (§5.2) | xT = f(valve geometry) (§5.2) | Identical | 直接互认 (Direct mutual recognition) | LOW |
| Two-phase flow method | Omega method (§7) | Omega method (§7) | Identical | 直接互认 (Direct mutual recognition) | LOW |
KEY DIFFERENCES SUMMARY
- No technical differences exist — GB/T 17213.2-2017 is a word-for-word translation of IEC 60534-2-1:2011. Mutual recognition: 直接互认 (Direct mutual recognition). Procurement impact: LOW.
REGULATORY LINKAGE TABLE (法规联动)
| Compliance Scenario | Chinese Regulatory Basis | International Regulatory Basis |
|---|---|---|
| Mandatory product certification | Not required for GB/T (recommended standard) | Not required for IEC standard |
| Engineering acceptance inspection | GB/T 17213.9-2005 (test procedures) | IEC 60534-2-3 (test procedures) |
| Import/export compliance | No mandatory inspection | Destination country customs standard |
| Designer/engineer obligation | N/A for product standard comparison | N/A for product standard comparison |
AUDIT FLAG RESOLUTION
- ✅ RESOLVED: Both A and B agree GB/T 17213.2-2017 is IDT to IEC 60534-2-1:2011. No technical deviations exist.
- ✅ FALSE POSITIVE (domain flag): GB/T 17213.2-2017 — flagged as potential TIER 1 product standard by B, but correctly classified as TIER 2 calculation method. Usage is valid because it defines equations, not product specifications.
PROCUREMENT VERDICT
- Accept GB/T 17213.2-2017 as direct equivalent to IEC 60534-2-1:2011 — no modification needed.
- Verify valve test reports reference GB/T 17213.9-2005 for flow capacity testing.
- Ensure valve nameplate shows Cv or Kv per GB/T 17213.2-2017 §3.1.
- No additional certification required for Chinese market (GB/T is recommended, not mandatory).
REFERENCE DOCUMENT CHECKLIST (配套调阅清单)
- GB/T 17213.2-2017 §4.1 — liquid sizing equation
- GB/T 17213.2-2017 §5.1 — gas sizing equation
- GB/T 17213.2-2017 §7 — two-phase flow method
FIELD INSPECTION CHECKLIST
- Verify valve nameplate shows Cv or Kv value
- Confirm test report references GB/T 17213.9-2005
- Check valve body material certificate matches order specification
- Verify actuator stroke matches sizing calculation
CONFIDENCE RATING
🟢 HIGH CONFIDENCE — data verified across two independent AI sources, all numeric values have clause references, no technical deviations exist.
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