# ISO 15761 Compliant Manufacturing Process for Gate Valves

## Introduction to ISO 15761 Standard

The ISO 15761 standard specifies the 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. Manufacturers adhering to ISO 15761 demonstrate their commitment to producing reliable and durable valves for critical applications.

## Key Stages of ISO 15761 Compliant Manufacturing

### 1. Material Selection and Verification

The manufacturing process begins with careful selection of materials that meet ISO 15761 requirements:

– Carbon steel or alloy steel for valve bodies
– Stainless steel for trim components
– Verification of material certificates and chemical composition
– Mechanical property testing

### 2. Precision Casting or Forging

The valve body manufacturing follows strict procedures:

– Pattern making and mold preparation for cast valves
– Controlled forging processes for forged valves
– Non-destructive testing (NDT) including radiographic and ultrasonic examination
– Heat treatment to achieve required mechanical properties

### 3. Machining Operations

Precision machining ensures dimensional accuracy:

– CNC machining of flow passages and sealing surfaces
– Thread cutting for stem and bonnet connections
– Surface finishing to specified roughness values
– Dimensional inspection at each machining stage

### 4. Assembly and Testing

Final assembly incorporates quality checks:

– Proper alignment of gate and seats
– Torque verification for bolted connections
– Hydrostatic shell and seat tests per ISO 5208
– Functional testing of operation mechanism

## Quality Assurance Measures

ISO 15761 compliance requires comprehensive quality control:

– Documented procedures for all manufacturing steps
– Traceability of materials and components
– Third-party inspection options
– Final documentation package including:
– Material test reports
– NDT reports
– Pressure test certificates
– Dimensional inspection records

## Benefits of ISO 15761 Compliance

Manufacturers and end-users gain significant advantages:

– Assurance of valve reliability in demanding services
– Interchangeability with other compliant valves
– Reduced risk of premature failure
– Compliance with international procurement specifications
– Enhanced safety in hydrocarbon processing

## Conclusion

The ISO 15761 compliant manufacturing process for gate valves represents the industry benchmark for quality and performance. By following this standardized approach, manufacturers ensure their products meet the rigorous demands of oil, gas, and petrochemical applications while providing customers with confidence in valve reliability and longevity.