ISO 15761 Standard Manufacturing Process for Gate Valves

# ISO 15761 Standard 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. This international standard ensures that gate valves meet stringent quality, performance, and safety criteria for critical applications in demanding environments.

## Key Stages of the Manufacturing Process

### 1. Material Selection and Preparation

Manufacturers must select materials that comply with ISO 15761 specifications:

The standard requires carbon steel, alloy steel, or stainless steel materials with documented chemical composition and mechanical properties. All raw materials undergo thorough inspection and testing before being approved for production.

### 2. Casting or Forging Process

The valve body manufacturing begins with either:

Casting: Molten metal is poured into precision molds to create valve components with complex geometries.

Forging: Metal is shaped under high pressure to create stronger, more durable components for high-pressure applications.

### 3. Machining Operations

Precision machining ensures dimensional accuracy:

• CNC turning for external surfaces
• Milling for flat surfaces and complex features
• Drilling and tapping for connection points
• Grinding for critical sealing surfaces

### 4. Assembly Process

The assembly stage follows strict quality control measures:

Each component is carefully fitted, including the gate, stem, seats, and packing. The assembly process includes multiple inspection points to verify proper alignment and function.

### 5. Pressure Testing

All valves undergo rigorous testing per ISO 15761 requirements:

## Quality Assurance and Certification

### Documentation Requirements

Manufacturers must maintain comprehensive records including material certificates, heat treatment reports, non-destructive testing results, and final inspection reports. These documents demonstrate compliance with ISO 15761 throughout the manufacturing process.

### Final Inspection and Marking

Before shipment, each valve receives:

• Visual inspection of all surfaces
• Operational testing (open/close cycles)
• Proper marking with required identification per standard
• Protective coating application

## Benefits of ISO 15761 Compliance

Gate valves manufactured according to ISO 15761 offer reliable performance in critical applications. The standardized manufacturing process ensures:

• Consistent quality across manufacturers
• Interchangeability of components
• Enhanced safety in operation
• Long service life in demanding conditions

## Conclusion

The ISO 15761 standard provides a comprehensive framework for gate valve manufacturing, from material selection to final testing. By adhering to these specifications, manufacturers can produce high-quality gate valves that meet the rigorous demands of the petroleum and petrochemical industries while ensuring safety and reliability.