# ISO 15761 Compliant Manufacturing Process for Gate Valves

## Understanding ISO 15761 Standards for Gate Valves

The ISO 15761 standard specifies requirements for steel gate valves used in petroleum, petrochemical, and related industries. This international standard defines the design, materials, testing, and inspection criteria that ensure gate valves meet stringent performance and safety requirements.

Manufacturers adhering to ISO 15761 must implement rigorous quality control measures throughout the production process. The standard covers valves with nominal sizes from DN 15 to DN 600 and pressure ratings from Class 150 to Class 2500.

## Key Stages in ISO 15761 Compliant Manufacturing

### 1. Material Selection and Verification

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

– Valve bodies and bonnets typically use forged or cast carbon steel, alloy steel, or stainless steel
– All materials must undergo chemical composition analysis and mechanical property testing
– Material certificates must be traceable to each production batch

### 2. Precision Machining Processes

CNC machining centers ensure dimensional accuracy for critical components:

– Gate and seat surfaces receive special attention for proper sealing
– Stem machining maintains tight tolerances for smooth operation
– All machining processes follow documented procedures with regular quality checks

### 3. Assembly and Testing Procedures

The assembly phase incorporates multiple quality checks:

– Each component undergoes visual inspection before assembly
– Torque specifications for bolted connections are strictly followed
– Functional testing includes:
– Shell tests at 1.5 times the rated pressure
– Seat leakage tests per API 598 requirements
– Operational torque verification

## Quality Assurance in ISO 15761 Manufacturing

### Documentation and Traceability

Complete documentation ensures compliance:

– Material test reports for all components
– Heat treatment records when applicable
– Non-destructive testing (NDT) reports
– Final inspection and test certificates

### Continuous Improvement Processes

ISO 15761 compliant manufacturers implement:

– Regular internal audits of manufacturing processes
– Employee training programs on quality standards
– Statistical process control methods
– Customer feedback analysis for product enhancement

## Benefits of ISO 15761 Compliance

Manufacturers following ISO 15761 standards provide customers with:

– Reliable performance in demanding applications
– Extended service life through superior materials and construction
– Consistent quality across production batches
– Compliance with international industry regulations
– Reduced maintenance requirements and downtime

The rigorous manufacturing process ensures gate valves meet the highest industry standards for safety and performance in critical applications.