YB 4072-1991 in English
VALIDBlast furnace hot air valve
- Issued on:1991-09-18
- Implemented on:1992-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$194.00
| Standard No: | YB 4072-1991 |
| Document status: | VALID |
| Title in English: | Blast furnace hot air valve |
| Title in Chinese: | 高炉热风阀 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 1991-09-18 |
| Implemented on: | 1992-01-01 |
| Professional Classification: | YB-Metallurgy |
| Related Keywords: | hot blast valve
blast furnace valve body hot air valve introduction analysis |
Introduction
Analysis of standard technical framework
YB4072-91 standard defines the complete technical system of hot blast valve for blast furnace, and its core elements include:
| Technical module | Cast-welded structure (RF3) | Fully welded structure (RF4) |
|---|---|---|
| Nominal diameter tolerance | ±4~7mm | ±3~5mm |
| Applicable temperature | ≤1300℃ | |
| Working pressure | 0.25~0.5MPa | |
| Non-destructive testing requirements | JB1152 Level I standard | |
Key technical requirements
5.2 Material specifications
The valve body material must meet the mechanical performance indicators of GB700 carbon structural steel and GB3077 alloy structural steel, and the castings must meet the YB3220.1 standard.
5.4 Welding Inspection
Main butt welds shall be subjected to:
1. Ultrasonic flaw detection (JB1152 Level I)
2. Annealing to eliminate stress
Test and Inspection System
| Test Items | Parameter Requirements | Judgment Criteria |
|---|---|---|
| Pressure Test | 1.5 Times Working Pressure/15min | No Leakage |
| Seal Test | Working Air Pressure/5min | Pressure Drop≤8% |
| Action Test | Open and Close with Full Stroke | No Jam |
Implementation suggestions
Selection guide
Select the structure type according to the diameter:
RF3 cast-welded structure: Applicable to nominal diameter ≤1500mm
RF4 fully welded structure: Applicable to large-size valves of 1800mm with high precision requirements
Maintenance points
1. The refractory castables must be kept dry, with the surface 3-5mm lower than the sealing surface
2. Avoid open-air stacking during storage
3. Designated lifting points must be used for lifting
Standard evolution
When this standard was issued in 1991, it first clarified the classification system of welded structures of hot air valves, and subsequent industry standards were mostly developed on this basis.
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