# ISO 15761 Compliant Manufacturing Process for Gate Valves
## Introduction to ISO 15761 Standard
The ISO 15761 standard specifies requirements for steel gate valves designed for petroleum, petrochemical, and related industries. Compliance with this standard ensures that gate valves meet stringent quality, performance, and safety criteria for critical applications.
## Key Stages in ISO 15761 Compliant Manufacturing
### 1. Material Selection and Verification
The manufacturing process begins with strict material selection according to ISO 15761 requirements. All raw materials undergo:
- Chemical composition analysis
- Mechanical property testing
- Non-destructive examination
- Material traceability documentation
### 2. Precision Casting and Forging
Gate valve bodies and critical components are manufactured using:
- Investment casting for complex geometries
- Closed-die forging for high-stress components
- Controlled cooling processes to achieve desired metallurgical properties
### 3. Machining and Dimensional Control
CNC machining ensures tight tolerances as specified in ISO 15761:
- Five-axis machining centers for complex profiles
- In-process dimensional verification
- Surface finish control per standard requirements
## Quality Assurance and Testing
### Pressure Testing Procedures
Every gate valve undergoes rigorous testing:
- Shell test at 1.5 times design pressure
- Seat leakage test per API 598 requirements
- High-pressure gas test for severe service valves
### Non-Destructive Examination
Critical welds and components receive:
- Radiographic testing (RT)
- Ultrasonic testing (UT)
- Liquid penetrant examination (PT)
- Magnetic particle inspection (MT)
## Certification and Documentation
Final products receive complete documentation package:
- Material test reports
- Inspection and test records
- Third-party verification certificates
- ISO 15761 compliance statement
Benefits of ISO 15761 Compliance
Manufacturing gate valves to ISO 15761 standards provides:
- Assured performance in critical applications
- Global acceptance in oil and gas projects
- Reduced risk of field failures
- Extended service life under demanding conditions
