Floating Ball Valve vs Trunnion: Key Differences Explained

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Design and Construction

The primary distinction between floating ball valves and trunnion ball valves lies in their design and construction. Floating ball valves feature a ball that "floats" in the valve body. This means that the ball is not fixed at the bottom; instead, it is held in place by the pressure of the fluid acting on it. This design allows for a tighter seal as the ball moves toward the seat, ensuring minimal leakage.On the other hand, trunnion ball valves have a fixed ball that is supported by trunnions at the top and the bottom. The ball does not float; instead, it rotates around its axis. This design is particularly advantageous for larger valves and high-pressure applications, as it provides stability and allows for better torque performance. This increased support reduces wear and extends the lifespan of the valve.

Applications and Use Cases

Floating ball valves are typically used in applications with lower pressure and smaller pipe sizes. They are commonly found in water, gas, and chemical applications, where they can effectively shut off flow without the need for intricate mechanisms. The simplicity of the floating design makes them easier to repair and maintain, which is especially appealing for smaller-scale operations.In contrast, trunnion ball valves are employed in more demanding industrial applications, including oil and gas, power generation, and petrochemical industries. They can handle higher pressures and larger volumes, making them ideal for bulk transfer and critical service applications. Their robustness helps mitigate risks and ensure uninterrupted flow in critical systems.

Performance and Flow Characteristics

When it comes to performance, floating ball valves generally offer lower torque requirements, allowing for easier operation. However, as the pressure increases, the floating design can lead to higher seat wear compared to the more stable trunnion design. This is because the floating ball adapts to the flow conditions, which can exert uneven pressure on the sealing surfaces.Trunnion ball valves, on the other hand, maintain a consistent flow characteristic, making them more efficient at managing high-volume flows. Their ability to handle higher pressures without leaking makes them invaluable in large-scale operations. The ball's trunnion design allows for less friction, which further extends the valve's lifespan and reliability in critical applications.

Maintenance and Repair

Maintenance considerations also differ between floating and trunnion ball valves. Floating ball valves are simpler, making them easier to disassemble and repair. Since they are usually constructed with fewer parts, routine maintenance can often be conducted quickly, which minimizes downtime.Trunnion ball valves, while more complex, are designed for longevity and durability. They often require specialized tools and expertise for servicing, primarily due to their intricate assembly. However, their robust design can mean less frequent maintenance, making them a cost-effective choice over time, especially in demanding environments.

Cost Implications

In terms of cost, floating ball valves are generally more affordable upfront, making them attractive for smaller projects or applications with budget constraints. Their lower manufacturing and maintenance costs can offer significant savings.Trunnion ball valves, while initially more expensive, tend to deliver long-term savings due to their durability and lower maintenance needs. For applications requiring reliability under high pressures and flows, the investment in trunnion ball valves often pays off in reduced downtime and increased safety.Ultimately, the choice between a floating ball valve and a trunnion ball valve will depend on specific project requirements. Consider factors such as fluid characteristics, operating pressure, and budget. For more information or to discuss your specific needs, please don’t hesitate to contact us.

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