ISO 15761 Manufacturing Process for Gate Valves

# ISO 15761 Manufacturing Process for Gate Valves

## Introduction

Gate valves are essential components in various industrial applications, particularly in pipelines where full flow or complete shut-off is required. The ISO 15761 standard provides specifications for the manufacturing process of these critical valves, ensuring quality, reliability, and performance. This article explores the key aspects of the ISO 15761 manufacturing process for gate valves.

## Material Selection

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

– Body and bonnet materials: Typically carbon steel, stainless steel, or alloy steel
– Trim components: Often made from corrosion-resistant materials
– Sealing surfaces: Usually stainless steel or hard-faced with stellite

## Key Manufacturing Steps

### 1. Casting or Forging

The valve body is created through either:

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

### 2. Machining Operations

Precision machining includes:

– CNC turning of valve bodies
– Milling of flange faces
– Drilling and tapping of bolt holes
– Grinding of sealing surfaces

### 3. Assembly Process

The assembly phase involves:

– Installation of the gate and stem
– Packing gland assembly
– Bonnet attachment
– Final torqueing of all fasteners

## Quality Control Measures

ISO 15761 mandates rigorous quality checks:

– Dimensional inspection at all stages
– Non-destructive testing (NDT) including:
– Radiographic testing
– Ultrasonic testing
– Liquid penetrant inspection
– Pressure testing to verify sealing performance

## Surface Treatment and Coating

Final surface preparations include:

– Shot blasting for surface preparation
– Application of protective coatings
– Marking and identification per ISO standards
– Final inspection before packaging

## Conclusion

The ISO 15761 manufacturing process ensures gate valves meet international standards for performance and reliability. By following these standardized procedures, manufacturers can produce gate valves that provide long service life and dependable operation in demanding industrial environments. The comprehensive approach from material selection to final testing guarantees quality at every stage of production.