# ISO 15761 Manufacturing Process for Gate Valves

## Introduction to ISO 15761

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 strict quality and performance criteria, making them suitable for demanding applications.

## Key Stages in the Manufacturing Process

### 1. Material Selection and Preparation

The manufacturing process begins with the careful selection of materials that comply with ISO 15761 requirements. Common materials include:

– Carbon steel
– Stainless steel
– Alloy steel

Raw materials undergo thorough inspection and testing before being approved for production.

### 2. Casting or Forging

Gate valve bodies are typically created through either:

– Sand casting for complex shapes
– Investment casting for precision components
– Forging for high-strength applications

The chosen method depends on the valve size, pressure rating, and material specifications.

### 3. Machining Operations

Precision machining ensures proper fit and function of all components:

– CNC turning for accurate dimensions
– Milling for flat surfaces and grooves
– Drilling and tapping for bolt holes
– Grinding for smooth sealing surfaces

### 4. Assembly Process

The assembly stage involves:

– Installing the gate and stem
– Mounting seats and seals
– Adding packing materials
– Attaching the bonnet and yoke

Each step requires careful alignment and torque specifications.

### 5. Testing and Quality Control

ISO 15761 mandates rigorous testing procedures:

– Hydrostatic testing for body strength
– Seat leakage tests
– Functional operation checks
– Material verification tests

## Special Considerations in ISO 15761 Compliance

Manufacturers must pay particular attention to:

– Wall thickness requirements
– Pressure-temperature ratings
– End connections (flanged, threaded, or welded)
– Stem design and material selection
– Fire-safe design when required

## Advantages of ISO 15761 Gate Valves

Gate valves manufactured to this standard offer:

– Reliable performance in harsh environments
– Long service life with proper maintenance
– Interchangeability between manufacturers
– Compliance with international safety standards
– Traceability of materials and processes

## Conclusion

The ISO 15761 manufacturing process for gate valves represents a comprehensive approach to producing high-quality valves for critical applications. By following this standardized process, manufacturers ensure their products meet the demanding requirements of the oil and gas industry while providing reliable, long-lasting performance.