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March 18, 2024 by Brina

A trunnion-mounted ball valve is a popular choice for high-pressure applications that need a tight, safe seal. They are a popular choice for industrial processes but also find applications in electrical industry compressors, turbines, and skids. These valves can handle a wide variety of fluids, including gases, liquids, and slurries.

A trunnion ball valve is characterized by its high stability under pressure and wide temperature range. The trunnion-mounted ball valve is designed to open even under full differential pressure. This feature allows it to be opened even with minimal downstream pressure. 

Due to the large differential pressure, trunnion-mounted ball valves are suitable for applications where a high-pressure opening is necessary. In addition, the valve’s design allows for emergency seals. 

If you want to know more about trunnion ball valves, follow this guide. 

Table of Contents

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• What Is A Trunnion Ball Valve?
  • How Does A Trunnion Ball Valve Work?
  • What Is The Structure of a Trunnion Ball Valve?
    • Advantages of Using Trunnion Ball Valve

What Is A Trunnion Ball Valve?

A trunnion ball valve comes with a stem that connects the ball to the exterior actuator lever. There is a hollow ball in the valve, which is rotated 90 degrees when you move the lever to either block or open the flow. Unlike a floating ball valve where the ball is floating without any support, the ball in the trunnion valve is connected to the stem.

When you move the handle, the ball rotates. If the hollow side is in front of the valve, the fluids flow easily. When you turn the lever, the stem moves, thereby rotating the ball, which blocks the fluid movement. 

The trunnion has three sections, each with spring-loaded seats. The polymer ring insert reduces friction on the ball, which is connected to the trunnion by a single shaft. This type of valve is more complex than the two-piece versions.

A trunnion ball valve is used for applications where the seal is critical to the process. The trunnion mounting allows the valve to take a large number of pressures, including high temperatures. This allows it to operate safely even in the hottest conditions. The trunnion-mount allows the valve to be used for a variety of fluids, including gasses, slurries, and liquids.

A trunnion ball valve is highly versatile and is used in many different industries. This valve features fire-safe stem packs, stainless steel seal injection fittings, and O-rings. It is commonly used in the gas, oil, and LNG industries. It can also be used in chemical and petrochemical processing.

How Does A Trunnion Ball Valve Work?

A trunnion ball valve is a simple mechanical device. The ball is inserted into a central bottom shaft, also called a trunnion, by means of an actuator. The ball then rotates against the trunnion to open and close the valve. The actuator turns the stem, which moves the ball. There are seals on the seat and stem to prevent leakage of fluid. 

The trunnion is an important part of the valve because of its stable operation under pressure and wide temperature range. The valve is made of several pieces and has a flanged design. The flanged type has a spring-loaded seat and polymer ring inserts to reduce friction. This allows the actuator to rotate in the direction of the ball, which is crucial for the proper operation of the valve.

A trunnion ball valve is a specialized type of ball valve with a wide range of temperature and pressure. Its unique operating dynamics make it useful for a variety of applications. For example, chemical manufacturing plants require strict management of leaks and high reactive temperatures. 

A trunnion ball is recommended for these applications because of its high-temperature resilience. In the petrochemical industry, trunnion ball valves are recommended to prevent rupture and leakage. These trunnion ball valves can handle high pressure and high volumes.

What Is The Structure of a Trunnion Ball Valve?

The structure of a trunnion ball valve is similar to an ordinary ball valve. The only difference is that this type of valve comes with an additional mechanical component for support. There are two anchors on the upper and lower side of the ball for support. It helps you to easily control the flow.

This type of valve has a wide temperature range and stability under pressure. This valve has multiple pieces that are attached to the stem or valve. The stem is connected to the casing using threaded connections. 

The trunnion ball valve is composed of a balling disk that is mounted on a trunnion. The stem and ball are connected together at one end. In a trunnion ball valve, the seat often makes contact with the sphere of the ball. This reduces the amount of torque that is generated while the valve is operating. The seats can be made of metal or soft Teflon, and they keep the sphere in place while the actuator moves up and down.

Another important part of a trunnion ball valve is the spring. The trunnion ball valve uses a static-conduction spring that connects the stem to the ball. This static spring protects the ball and the body from being damaged by dirty or abrasive liquids. The static-conduction spring is also an important feature of the trunnion-mounted ball valve.

Advantages of Using Trunnion Ball Valve

There are many advantages of a trunnion ball valve. First of all, it does not produce displacement when closed. Instead, pressure on the media is transferred to the floating seat, which forces the ball into a seated position, achieving sealing. 

These valves are suitable for high-pressure services. Some models are capable of working at pressures of over 40 bar. Some of the best valves can withstand pressures from 150 to 2500 psi. Their robustness and high-temperature resilience make them the preferred choice for petrochemical industry applications. They are also useful in high-volume petrochemical pipelines and gas lines. These are some of the benefits of a trunnion ball valve.

A trunnion mounted ball valve has a cavity relief seat that is energized by springs. The springs energize the seal and generate pressure, which is usually less than the pressure in the line. However, when a trunnion-mounted ball vale fails to seal, the cavity pressure overcomes the springs’ load, resulting in a leak-free valve.

The most significant benefit of a trunnion-mounted ball valve is its ability to open at full differential pressure. Because the trunnion-mounted ball has a high differential pressure, it is possible to open it with minimal downstream pressure. This feature allows trunnion-mounted ball valves to be opened under differential pressure and thereby reduce a variety of downstream piping problems.

Another key benefit of a trunnion-mounted ball valve is its ability to be double-block or double-bleed. A trunnion-mounted ball valve with a bleed body can help you retest and improve the sealing capability of a ball valve. By increasing the value of your trunnion-mounted ball valves, you can save a lot of money.

A trunnion mounted ball valve has many advantages over a free-floating type. Its wide operating range, low cost, and increased versatility make it ideal for high-pressure applications. Its spherical trunnion-ball valve is ideal for high-pressure applications where pressure is an issue. Because of their flexibility, trunnion-mounted ball-valves are great for industries of all sizes.