When it comes to controlling the flow of fluids in a piping system, valves play an essential role. Among the different types of valves available, ball valves and butterfly valves are the most commonly used. But what sets them apart? Explore ball valves vs. butterfly valves. What’s the difference between them? Why choose one or the other?
Ball Valves
As you might expect from their name, valves have a ball inside that controls the fluid flow. The ball has a hole through its center, which aligns with the pipe when open and sits perpendicular to the pipe opening and the flow of the liquid or gas inside the pipe when it's closed.
Ball valves are known for their tight seals and excellent shutoff capabilities, making them ideal for applications requiring high pressure and temperature handling. They're typically used in industries like oil and gas, where they can handle pressures up to 1000 bar or 15,000 PSI and temperatures up to 750°F (400°C) depending on what they’re made of, their size, and their design.
However, ball valves are relatively heavy and bulky, especially in larger sizes. They also require more space for installation than other types of industrial valves. Furthermore, while they work well in smaller pipe diameters, they become less efficient as the pipe diameter increases due to the large ball required.
Butterfly Valves
Butterfly valves, on the other hand, consist of a metal disc positioned in the center of the pipe. The disc rotates on a stem in its center to control the fluid flow, so it looks a little like a butterfly body with wings on either side of the central stem.
Butterfly valves have a distinct advantage in terms of size and weight. They are significantly lighter and more compact than ball valves, making them easier to install and maintain. Additionally, they are better suited for larger pipe diameters, thanks to their design.
In terms of applications, butterfly valves are typically used in systems that operate at lower temperatures and pressures. They are commonly found in water distribution, chemical services, and HVAC systems. However, they may not offer as tight a seal as ball valves, which can lead to slight leakage. The maximum pressure and temperature for a butterfly valve is much lower than that of a ball valve, closer to 250 PSI and 400° F (204° C).
Choosing a ball valve vs. a butterfly valve depends on knowing the differences between them relative to your specific application needs. If you're dealing with high pressures and temperatures, a ball valve might be your best bet. However, if you're working with larger pipe diameters and lower temperatures and pressures, a butterfly valve could be the more suitable choice. Both valves have their advantages and disadvantages, and understanding these can help you make an informed decision that will enhance the efficiency and safety of your piping system.