# ISO 15761 Standard Manufacturing Process for Gate Valves
## Introduction to ISO 15761 Standard
The ISO 15761 standard specifies the requirements for the design, manufacturing, and testing of steel gate valves for petroleum, petrochemical, and related industries. This international standard ensures that gate valves meet stringent quality and performance criteria, making them suitable for demanding applications.
## Key Stages of 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 of Valve Components
The main valve components are created through either:
– Sand casting for complex shapes
– Investment casting for precision parts
– Forging for high-strength applications
### 3. Machining Operations
Precision machining ensures all components meet exact dimensional tolerances:
– CNC turning for body and bonnet
– Milling for flange faces
– Drilling and tapping for bolt holes
### 4. Assembly Process
The assembly stage includes:
– Installation of stem and gate
– Seating of sealing surfaces
– Packing gland installation
– Bonnet attachment
### 5. Testing and Quality Control
Each valve undergoes rigorous testing according to ISO 15761 requirements:
– Shell test (1.5 times design pressure)
– Seat test (1.1 times design pressure)
– Backseat test (when applicable)
– Operational torque test
## Advantages of ISO 15761 Compliant Gate Valves
Manufacturing gate valves according to ISO 15761 offers several benefits:
– Consistent quality across manufacturers
– Improved safety in critical applications
– Enhanced durability and service life
– Global acceptance in the oil and gas industry
## Conclusion
The ISO 15761 standard provides a comprehensive framework for manufacturing high-quality gate valves. By following this standardized process, manufacturers can produce reliable products that meet the demanding requirements of the petroleum and petrochemical industries while ensuring safety and performance.