Floating & Trunnion Mounted Ball Valves 1

The size and pressure cut-off for floating versus trunnion will varu by manufacturer depending upon the type of seals used. With floating ball, upstream pressure pushes the ball into the downstream seat and giving very effective shut-off. However, if the pressure is too high, the resulting force on the ball can crush the downstream seat and / or create so much friction that you cannot turn the valve to open it. This is why they have lower pressure ratings. Trunnion valves are more expensive to make and tend to have more external joint that are potential leak points. Normally, trunnions are upstream sealing, but not always. Some are still downstream seat sealing and use the trunnion to limit the forces on the seat. The trunnion bearings inside the valve withstand the force from pressure across the ball and enable a lower friction material, smaller radius to enable lower operating torque against higher pressures. Both are good provided you use them within their limits. If you spec. trunnions for all applications, you are wasting money. If you use floatings balls anywhere near their limits, you will suffer reliability problems.

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Choosing a metal seated ball valve is essential for safe, efficient operations. Ball valves offer many benefits over other valves, including a more compact design, tight sealing, and easy operation. However, it&#;s important to know whether you will need a floating ball valve or a trunnion ball valve for your application. We&#;ll discuss the differences between the two and which types of applications you might choose one over the other for.

What are the Differences Between a Trunnion and a Floating Metal Seated Ball Valve?

First, it&#;s important to understand the differences between floating and trunnion ball valves. Essentially, these are two different ways the valve supports the internal ball.

In a floating ball valve, the seats hold the ball in place and it floats around in the valve body. Upstream pressure from liquid or gas pushes the ball up against the downstream seat. This helps form a leak tight seal.

By contrast a trunnion metal seated ball valve uses shafts on the top and bottom of the ball to hold it in place. As such, the ball stays in place and does not move laterally inside the valve body. Instead, to provide a tight seal, floating seats surround the ball and are always in contact with it. With pressure, the seats press against the ball to form a seal.

Generally speaking, a floating ball valve will require more torque to operate than a trunnion ball valve. Also, floating ball valves are typically limited to smaller valves compared to trunnion options.

If you are looking for more details, kindly visit Trunnion Vs Floating Ball Valve.

When to Choose Floating vs. Trunnion for Severe Service Ball Valves?

When considering which severe service ball valves to use for your operations, you&#;ll need to decide between floating and trunnion style ball valves. There are a few things to think about to help you choose the right option.

First, obviously cost will likely come to mind as you&#;re deciding on a valve. Typically, floating ball valves are less expensive than trunnion ball valves. This is because their design and manufacturing is less complex than trunnion ball valves. They don&#;t need spring-loaded seats or extra shafts to hold the ball in place, so there are fewer internal components.

However, you also need to consider your application. As we mentioned, floating ball valves tend to need more torque to operate. This is especially true as pressure and valve size increase. Therefore, in high pressure applications, many people choose trunnion style valves instead of floating ball valves. This is because they&#;re more versatile and can withstand higher pressures and they&#;re easier to operate in such conditions.

In addition, most of the time floating ball valves are much smaller. This is perfect if you&#;re working with smaller size pipelines. However, for larger pipelines, you may need a trunnion ball valve. These types of valves can often use much larger diameter balls than floating options.

Dependable, Heavy-Duty Ball Valves since

When you need high quality ball valves for severe service applications, choose Copeland Valve for your needs. We&#;ve been manufacturing ball valves since and offer the most innovative and high quality valves on the market today. Our team works with you to help you find the most effective and budget-friendly solutions for your applications. In addition to high quality design and manufacturing, we also offer fast turnaround and competitive pricing. Whether you need a forged ball valve or a custom-designed slurry valve, we&#;re here to help. Call us now at (346) 384- to request a quote!

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