# ISO 15761 Compliant Manufacturing Process for Gate Valves

## Introduction to ISO 15761 Standard

The ISO 15761 standard specifies requirements for steel gate valves used in petroleum, petrochemical, and related industries. This international standard ensures that gate valves meet stringent quality, performance, and safety criteria for critical applications.

Manufacturers adhering to ISO 15761 demonstrate their commitment to producing reliable valves that can withstand demanding operating conditions while maintaining leak-tight performance throughout their service life.

## Key Stages of ISO 15761 Compliant Manufacturing

### 1. Material Selection and Verification

The manufacturing process begins with careful material selection according to ISO 15761 requirements:

– Valve bodies and bonnets typically use carbon steel or alloy steel
– Trim materials must be suitable for the intended service conditions
– All materials undergo rigorous chemical composition and mechanical property testing
– Material traceability is maintained throughout the production process

### 2. Precision Casting or Forging

Gate valve bodies are manufactured using either:

– Investment casting for complex geometries
– Sand casting for larger valves
– Forging for high-pressure applications

Each method must meet ISO 15761 dimensional tolerances and surface finish requirements.

### 3. Machining Operations

Critical machining processes include:

– CNC machining of flow passages and sealing surfaces
– Precision boring of seat areas
– Thread cutting for stem connections
– Surface grinding for flatness requirements

All machining operations maintain tight tolerances specified in the standard.

### 4. Assembly and Testing

The final assembly stage incorporates:

– Proper alignment of gate and seats
– Correct packing installation
– Appropriate bolting procedures
– Functional testing including:
– Shell test (1.5 times design pressure)
– Seat leakage test
– Operation torque test
– Additional tests as required by the standard

## Quality Assurance Measures

ISO 15761 compliance requires comprehensive quality control:

– Dimensional inspection at all manufacturing stages
– Non-destructive testing (NDT) including:
– Liquid penetrant testing
– Magnetic particle inspection
– Radiographic testing
– Ultrasonic testing

– Pressure testing documentation
– Final inspection and certification

## Benefits of ISO 15761 Compliance

Manufacturers following this standard provide customers with:

– Proven reliability in harsh environments
– Consistent performance across production batches
– Documentation for regulatory compliance
– Extended service life through proper material selection
– Reduced risk of premature failure

## Conclusion

The ISO 15761 compliant manufacturing process for gate valves represents industry best practices for producing high-quality, reliable valves. By adhering to this standard, manufacturers ensure their products meet the rigorous demands of petroleum and petrochemical applications while providing customers with documented quality assurance throughout the production process.