Floating Ball Valves vs Trunnion Ball Valves

By Carson Hu

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24 Oct, 2019

Right now, there are over 3,000 facilities on the Outer Continental Shelf involved in the collection and treatment of oil and gas. These oils and gases are collected from wells -- a process that's performed using certain types of high pressure valves. Of course, different types of American ball valves offer different results and it's crucial that the right projects are executed with the right types of valves. Quite often, the types of valves being used are ball valves, sometimes referred to as pig ball valves or pig vales (as they are used in conjunction with pipeline pigging systems). Before sourcing and investing in valves, it is important to understand the degree to which these valves may differ from one another. Let's delve into some of the defining characteristics of ball valve types. Ball Valve Body Styles Before getting into the exact types of ball valves that are available at the moment, it's important to remember that there are actually four separate types of body styles. These include the single body, split body, top entry, and welded styles. The styles of ball valves available differ from the types of ball valves available. This means that there are number of potential variations that you can see in ball valves. The great thing about this variety is that it means that there is more potential applicability in ball valves than there would be otherwise. Full Port Ball Valves: Turning to the different body types of ball valves, we can first look at the full port ball valve. A full port ball valve is defined by the fact that it has an oversized ball. The oversized ball has a purpose -- it is the same size as the pipeline. This means that there will be less potential friction less than there would be if the ball wasn't the same size as the pipeline, and the flow involved is unrestricted. The valve is larger as well. Standard Port Valves: As their name suggests, standard port valve are quite usual. This means they're less expensive than some alternatives. This type of valve has a smaller ball, and therefore the valve itself is smaller as well. The flow going through the pipe will in turn be smaller and will typically be about one pipe size smaller than the valve's pipe size. This makes it more restricted. The V Port Ball Valve: The V port ball valve is named after its V-shaped seat. What this means is that the orifice through which the product flows can be more easily opened and closed to change its direction. While many like this idea, the construction of this type of valve means that it can't be used just anywhere. It typically needs to be utilized in a more secure site. When the valve is opened, it is usually opened at the "small end" first, which helps stabilize the flow control. Trunnion Ball Valve: Then there is the trunnion ball valve, which doesn't exactly give much away through its name. This type of valve will actually anchor the valve at the top and the bottom through a particular mechanism. This would be applied on larger and more high pressure valves. While this type of valve isn't going to fit everyone's needs, it can definitely be used for particularly high pressure projects. Manually Operated Valves: Finally, these types of valves can be closed more quickly than their counterparts. Though this is an advantage in some cases, it also means that there can be a risk of a water hammer. These can include an actuator, which can be pneumatically or motor operated, which will in turn be used for on/off flow control. The valve will also have a positioner, which transforms the control signal into an actuator position. The flexibility of this type of valve is certainly an advantage to most projects. Now that you're more familiar with the styles and types of ball valves, you'll be in a better position to make decisions that will support your needs. For more information, please contact us today.

I. Introduction

Brief explanation of the importance of selecting the right valve for industrial applications.

Selecting the right valve for industrial applications is crucial to ensure optimal performance, safety, and efficiency. Different valves have distinct features and capabilities that make them suitable for specific applications. Using the wrong valve can lead to leaks, pressure loss, contamination, or even equipment failure, which can be costly and dangerous. Therefore, it is important to consider various factors such as fluid type, flow rate, pressure, temperature, environmental conditions, and other requirements when choosing a valve. Selecting the right valve not only ensures efficient operation but also increases productivity, minimizes downtime, and reduces maintenance costs.



Mention the two types of valves that will be discussed: floating ball valves and trunnion ball valves.

In this blog post, we will discuss the two types of ball valves commonly used in industrial applications: floating ball valves and trunnion ball valves. Both types of valves have a spherical closure element (ball) that rotates to control the fluid flow. However, they differ in their design, construction, and performance. Floating ball valves use a floating ball that is held in place by two sealing rings that press against it when the valve is closed. Trunnion ball valves have a fixed ball that is supported by trunnion bearings that helps distribute the load evenly across the valve. We will explore the advantages, disadvantages, and applications of each type of valve and provide a comparison between them. By understanding the key differences between floating ball valves and trunnion ball valves, you can make an informed decision when selecting the right valve for your industrial application.

II. Floating Ball Valves

Definition and explanation of how a floating ball valve works.

A floating ball valve is a type of ball valve that uses a hollow ball to control fluid flow. The ball floats in the valve body and moves in response to the pressure difference between the upstream and downstream sides of the valve. Two sealing rings push the ball to the valve seat, creating a tight seal that prevents fluid from passing through when the valve is closed. To open the valve, the stem attached to the ball rotates it on its axis, allowing fluid to flow. People use floating ball valves commonly in low- to medium-pressure applications for their reliable operation and good sealing performance.

Advantages and disadvantages of using floating ball valves.

Floating ball valves offer several advantages in industrial applications. One of the main advantages is their low flow resistance, which helps to minimize energy consumption and increase system efficiency. They also have a simple design and are easy to operate and maintain, making them cost-effective solutions for many applications.

Even under high-pressure conditions, floating ball valves offer good sealing performance, and people can use them with a variety of fluids, including water, oil, gas, and corrosive chemicals. Additionally, they are less prone to damage due to their lack of fixed bearings and have a longer service life than other types of valves. However, there are also some disadvantages to using floating ball valves, such as limited temperature and pressure ranges, and the potential for leakage if there is excessive wear or damage to the sealing rings.

III. Trunnion Ball Valves

Definition and explanation of how a trunnion ball valve works.

A trunnion ball valve is a type of ball valve that uses a fixed ball to control fluid flow. Two trunnion bearings support the ball, distributing the load evenly and reducing friction. The upstream pressure pushes the ball against the downstream seat to create a tight seal when the valve is closed, preventing fluid from passing through. To open the valve, the stem attached to the ball rotates it on its axis, allowing fluid to flow. Trunnion ball valves commonly use stable and reliable operation, can withstand high temperatures and pressures, and individuals often use them in high-pressure and large-diameter applications.

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Additionally, they provide good sealing performance even under low-pressure conditions and are less prone to leakage due to their fixed bearings.

Advantages and disadvantages

Trunnion ball valves offer several advantages in industrial applications. They are known for their high-pressure and temperature resistance, making them ideal for use in pipelines that transport fluids under extreme conditions. Their fixed bearings provide enhanced stability and prevent damage to the ball and valve seat, which reduces the risk of leakage and extends the valve’s service life. Due to their design and construction, trunnion ball valves also handle large volumes of fluid, making them suitable for use in various industries such as oil and gas, chemical, and petrochemical.

However, there are also some disadvantages to using trunnion ball valves, including higher cost due to their complex construction, higher operating torque, and increased maintenance requirements. They may also be less effective at low pressure and temperature ranges, and their larger size and weight may make them less suitable for smaller applications.

Trunnion ball valves are widely used in various industries where high pressure, high temperature, and corrosive fluids are involved. These include oil and gas pipelines, petrochemical plants, hydrocarbon processing, LNG facilities, and chemical manufacturing plants. Trunnion ball valves are particularly suitable for applications that require precise flow control and tight shut-off, such as in natural gas distribution systems, fuel gas systems, and crude oil pipelines. They are also commonly used in power generation, refining, and water treatment applications. Due to their robust design, trunnion ball valves can handle large volumes of fluid and are ideal for use in both onshore and offshore environments. Their ability to withstand extreme temperatures, pressures, and corrosive environments makes them a popular choice for demanding industrial applications.

IV. Key Differences Between Floating Ball valve and Trunnion Ball Valve

The key differences between floating ball and trunnion ball valves lie in their design and construction. Both types of valves use a spherical element (ball) to control fluid flow. The way the ball is supported and how it seals against the valve seat differ. Floating ball valves use two sealing rings that press against the ball to create a tight seal. Trunnion ball valves use two fixed bearings to support the ball and minimize friction.

This design allows trunnion ball valves to handle higher pressure and temperature applications compared to floating ball valves. Trunnion ball valves are also more suitable for larger diameter pipes, as they can handle greater volumes of fluid. Additionally, trunnion ball valves require a higher torque to operate due to their design complexity and fixed bearings. Floating ball valves are generally less expensive than trunnion ball valves. This is due to their simpler design and lower material costs. The choice between the two types ultimately depends on specific requirements. Both types of valves have their own advantages and disadvantages.

V. Which Valve Should You Choose?

When deciding between a floating ball valve and a trunnion ball valve, it’s important to consider the specific requirements of your industrial application. Floating ball valves are generally more cost-effective and suitable for smaller diameter pipes or low-pressure applications. They are also easier to operate and maintain. Trunnion ball valves are designed for high-pressure, high-temperature applications. They are more suitable for larger diameter pipes that require precise flow control.

They are also more durable and have a longer service life compared to floating ball valves. The choice between floating ball and trunnion ball valves depends on your specific needs. Consider factors such as pipe size, fluid, and required precision and control. Consult with a qualified engineer or valve specialist to determine the best option for your application.

VI. Conclusion

In conclusion, understanding the key differences is essential for selecting the right valve. Both types of valves function similarly by using a ball to control fluid flow. The way the ball is supported and how it seals differ against the valve seat. Floating ball valves are generally more cost-effective and suitable for low-pressure applications and smaller diameter pipes. Trunnion ball valves, on the other hand, are designed for high-pressure, high-temperature applications and are more suitable for larger diameter pipes that require precise flow control. When deciding between a floating ball valve and a trunnion ball valve, consider your application’s requirements. Consult with a qualified engineer or valve specialist. They can help you determine which option is best suited for your specific application.

By understanding the differences between these two valves, you can make an informed decision. Choose the valve that will work best for your application, ensuring optimal performance, efficiency, and safety. Take the time to carefully evaluate your needs. This will help you find the valve that will deliver the best results and long-term value for your operation.

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