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# ISO 15761 Manufacturing Process for Gate Valves
Introduction to ISO 15761 Gate Valves
Gate valves manufactured under ISO 15761 standards are widely used in industrial applications for their reliable shut-off capabilities. This international standard specifies requirements for steel gate valves designed for petroleum, petrochemical, and related industries.
Key Manufacturing Stages
1. Material Selection
The manufacturing process begins with selecting appropriate materials according to ISO 15761 specifications. Common materials include carbon steel, stainless steel, and alloy steel, chosen based on pressure ratings and service conditions.
2. Casting or Forging
Valve bodies are typically produced through casting or forging processes. Forged bodies offer superior strength for high-pressure applications, while cast bodies are more economical for standard pressure ratings.
3. Machining Operations
Precision machining ensures proper sealing surfaces and dimensional accuracy. Critical components like the gate, seats, and stem undergo CNC machining to meet tight tolerances specified in ISO 15761.
4. Assembly Process
Components are carefully assembled with attention to:
- Gate alignment with seats
- Proper stem-to-gate connection
- Correct packing installation
- Bonnet sealing
5. Testing and Inspection
Each valve undergoes rigorous testing including:
- Shell test (1.5 times design pressure)
- Seat leakage test
- Operation torque test
- Material verification
Quality Assurance Measures
ISO 15761 mandates strict quality control throughout manufacturing. Documentation includes material certificates, heat treatment records, NDT reports, and test certificates. Final inspection verifies dimensional compliance and functional performance.
Conclusion
The ISO 15761 manufacturing process ensures gate valves meet international standards for performance and reliability in demanding industrial applications. From material selection to final testing, each step contributes to producing valves that provide leak-tight shutoff and long service life.