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ISO 15761 Compliant Gate Valve Manufacturing Process

# ISO 15761 Compliant Gate Valve Manufacturing Process

## Introduction to ISO 15761 Standard

The ISO 15761 standard specifies requirements for steel gate valves designed for petroleum, petrochemical, and allied industries. This international standard ensures that gate valves meet strict quality, performance, and safety criteria for critical applications.

Manufacturers adhering to ISO 15761 must follow precise manufacturing processes to guarantee valve reliability and longevity in demanding operating conditions.

## Raw Material Selection and Inspection

The manufacturing process begins with careful material selection:

– Valve body and bonnet materials must conform to specified grades of carbon steel, alloy steel, or stainless steel
– All incoming materials undergo rigorous chemical composition verification
– Mechanical property testing ensures materials meet required strength and toughness standards
– Non-destructive testing (NDT) methods detect any internal flaws or defects

## Machining and Component Fabrication

Precision machining forms the core of ISO 15761 gate valve production:

### Body and Bonnet Machining

– CNC machining centers create accurate valve body cavities
– Boring operations ensure proper seat alignment
– Flange faces are machined to exact flatness specifications
– Threading operations create precise stem and yoke connections

### Internal Component Production

– Gate and seat rings are precision ground for optimal sealing
– Stem machining maintains tight dimensional tolerances
– Yoke and gland components are fabricated to exact specifications

## Assembly and Testing Procedures

The assembly phase combines all components with strict quality control:

– Each valve undergoes step-by-step assembly by trained technicians
– Proper stem-to-gate alignment is verified
– Bolting torque values are carefully monitored
– Gland packing is installed with precise compression

### Pressure Testing

Every ISO 15761 gate valve must pass:

– Shell test at 1.5 times maximum working pressure
– Seat leakage test per API 598 requirements
– Backseat test for stem sealing capability
– Final operational test for smooth function

## Surface Treatment and Coating

To ensure corrosion resistance:

– All surfaces receive thorough cleaning and preparation
– Specialized coatings are applied based on service requirements
– Critical sealing surfaces receive protective treatments
– Final paint coatings meet specified thickness standards

## Quality Documentation and Certification

The manufacturing process concludes with comprehensive documentation:

– Material test reports for all components
– Dimensional inspection records
– Pressure test certificates
– Non-destructive examination reports
– Final assembly and testing documentation
– ISO 15761 compliance certification

## Continuous Improvement in Manufacturing

Leading manufacturers implement ongoing process enhancements:

– Regular review of manufacturing procedures
– Incorporation of advanced machining technologies
– Employee training programs for quality assurance
– Feedback loops from field performance data
– Process optimization through lean manufacturing principles

By strictly following the ISO 15761 manufacturing process, gate valve producers ensure their products deliver reliable performance in the most demanding industrial applications while meeting international quality standards.