标题为：ISO 15761 Manufacturing Process for Gate Valves
# ISO 15761 Manufacturing Process for Gate Valves
Introduction to ISO 15761 Standard
The ISO 15761 standard specifies the requirements for the manufacturing process of steel gate valves designed for petroleum, petrochemical, and related industries. This international standard ensures that gate valves meet stringent quality, performance, and safety criteria for critical applications.
Key Stages in the Manufacturing Process
1. Material Selection and Preparation
The manufacturing process begins with careful selection of materials that comply with ISO 15761 specifications. Common materials include carbon steel, stainless steel, and alloy steel. Raw materials undergo rigorous testing for chemical composition and mechanical properties before being approved for production.
2. Casting or Forging of Valve Components
Gate valve bodies and bonnets are typically produced through either casting or forging processes:
- Casting: Molten metal is poured into molds to create valve components
- Forging: Metal is shaped under high pressure while in solid state
Both methods must meet ISO 15761 requirements for dimensional accuracy and material integrity.
3. Machining Operations
Precision machining is critical for ensuring proper sealing and operation of gate valves. Key machining processes include:
- Turning and boring of valve bodies
- Milling of flange faces
- Drilling and tapping of bolt holes
- Grinding of sealing surfaces
4. Assembly and Testing
The final assembly stage involves:
- Installation of the gate, stem, and sealing components
- Application of appropriate lubricants
- Pressure testing according to ISO 15761 requirements
- Final inspection and quality control checks
Quality Control Measures
Throughout the manufacturing process, multiple quality control measures are implemented:
- Non-destructive testing (NDT) including radiographic, ultrasonic, and liquid penetrant inspection
- Dimensional verification at critical stages
- Material certification and traceability
- Pressure testing to verify leak-tightness
- Functional testing of valve operation
Conclusion
The ISO 15761 manufacturing process for gate valves ensures consistent quality and reliability for critical industrial applications. By adhering to this international standard, manufacturers can produce gate valves that meet the demanding requirements of the petroleum and petrochemical industries while ensuring safety and performance throughout their service life.
