Introduction

A duplex ball valve is a type of industrial valve designed for controlling fluid flow in pipelines. It is made from duplex stainless steel, a material known for its high strength and excellent corrosion resistance. These valves are commonly used in industries such as oil and gas, chemical processing, and marine applications where durability and reliability are essential.

Features and Benefits

1. Material Strength – Duplex stainless steel provides a higher yield strength compared to standard stainless steel, making the valve more durable under high pressure.

2. Corrosion Resistance – These valves resist pitting, crevice corrosion, and stress corrosion cracking, making them ideal for harsh environments.

3. Longevity – With superior mechanical properties, duplex ball valves have a longer lifespan, reducing maintenance costs.

4. High Performance – The robust construction ensures efficient sealing, preventing leaks and ensuring smooth operation.

5. Temperature Resistance – Suitable for applications requiring operation under extreme temperatures.

Working Principle

A duplex ball valve operates using a spherical ball with a hole through its center. When the handle is turned, the ball rotates to either allow or block the flow of fluid. This simple mechanism ensures quick opening and closing with minimal pressure drop.

Applications

• Oil & Gas Industry: Used in offshore and onshore pipelines due to high pressure and corrosion resistance.

• Chemical Processing: Ideal for handling aggressive chemicals and high temperatures.

• Marine Industry: Used in seawater applications where corrosion resistance is critical.

• Water Treatment Plants: Essential for regulating flow in harsh chemical environments.

Types of Duplex Ball Valves

1. Floating Ball Valve – The ball is free to move slightly within the valve body, allowing a tight seal.

2. Trunnion-Mounted Ball Valve – The ball is fixed in position with additional support, suitable for high-pressure applications.

3. Reduced Bore and Full Bore Valves – Full bore valves allow unobstructed flow, while reduced bore valves are cost-effective for smaller pipelines.

Maintenance and Considerations

• Regular Inspection: Periodic checks ensure optimal performance.

• Lubrication: Keeping moving parts well-lubricated extends lifespan.

• Proper Installation: Ensuring correct alignment prevents operational issues.

Conclusion

Duplex ball valves are an excellent choice for industries requiring high strength, corrosion resistance, and durability. Their robust performance in harsh conditions makes them a reliable option for fluid control applications.