# ISO 15761 Compliant Gate Valve Manufacturing Process
## Introduction to ISO 15761 Standard
The ISO 15761 standard specifies the requirements for steel gate valves used in petroleum, petrochemical, and related 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 product reliability and compliance. This article explores the key stages of producing ISO 15761 compliant gate valves.
## Material Selection and Preparation
The manufacturing process begins with careful material selection:
– Valve body: Typically made from carbon steel, stainless steel, or alloy steel
– Gate and seat materials: Selected for wear resistance and compatibility with process fluids
– Stem material: Usually stainless steel for corrosion resistance and strength
Raw materials undergo rigorous testing for chemical composition and mechanical properties before being approved for production.
## Machining and Component Fabrication
Precision machining forms the core of gate valve manufacturing:
### Body Machining
The valve body receives multiple machining operations including:
– Rough turning of external surfaces
– Boring of flow passages
– Facing of flange surfaces
– Drilling and tapping of bolt holes
### Gate and Stem Production
Key components undergo specialized machining:
– Gate profiling to exact dimensions
– Stem turning and threading
– Surface finishing for optimal sealing
## Assembly Process
The assembly phase brings all components together:
1. Seat installation into the valve body
2. Gate insertion and alignment
3. Stem connection to the gate
4. Packing gland assembly
5. Final torqueing of all fasteners
Each assembly step includes quality checks to ensure proper fit and function.
## Testing and Quality Control
ISO 15761 requires comprehensive testing:
### Pressure Testing
– Shell test: 1.5 times maximum working pressure
– Seat test: 1.1 times maximum working pressure
– Backseat test (when applicable)
### Functional Testing
– Full cycle operation test
– Leak detection
– Torque measurement
All test results are documented for quality assurance and traceability.
## Surface Treatment and Coating
Final surface preparations include:
– Shot blasting for surface cleaning
– Primer application
– Final coating (epoxy, paint, or other specified finish)
– Marking and labeling per ISO 15761 requirements
## Packaging and Shipping
Completed valves receive protective packaging:
– Internal protection against moisture
– Flange face protection
– Proper crating for transportation
– Complete documentation package
The ISO 15761 compliant manufacturing process ensures gate valves meet the highest industry standards for performance and reliability in demanding applications. From material selection to final testing, each step is carefully controlled to deliver products that operators can depend on in critical service conditions.
