Side Entry Trunnion Ball Valve: Key Features & Applications

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      Did you know that side entry trunnion ball valves are revolutionizing industrial fluid control? With their robust design and efficient operation, these valves are becoming the go-to choice for critical applications. In this post, we'll dive into the world of side entry trunnion ball valves, exploring their construction, working principle, and diverse industrial uses.

      From oil and gas to petrochemical plants, these valves play a crucial role in regulating high-pressure flows with unwavering reliability. Join us as we uncover the inner workings and advantages of side entry trunnion ball valves in ensuring seamless operations across various industries.

      Side entry trunnion mounted ball valve

      Fundamentals of Trunnion Ball Valve Design

      Key Features

      Trunnion ball valves are designed with a fixed ball that is supported by trunnions. This unique design ensures low operating torque and reduces wear on the valve seats. The fixed ball allows for increased stability during high-pressure operations, making it suitable for a wide range of applications.

      Trunnion ball valves are commonly used in high-pressure and large-diameter applications due to their robust design. The trunnions provide additional support to the ball, allowing it to withstand the forces exerted on it during operation. This makes them an ideal choice for industries such as oil and gas, petrochemical, and power generation where reliable performance under high pressure is crucial.

      The reduced operating torque of trunnion ball valves results in easier operation and maintenance. With lower torque requirements, these valves can be operated using smaller actuators, leading to cost savings in terms of equipment and energy consumption.


      Trunnion ball valves find extensive use in various industries including natural gas transmission pipelines, refining processes, chemical plants, and more. Their ability to handle high pressures efficiently makes them indispensable in critical processes where safety and reliability are paramount.

      Side Entry Trunnion Ball Valve Functionality

      Easy Maintenance Access

      Side entry trunnion ball valves are designed to allow easy access for maintenance without the need to remove the entire valve from the pipeline. This feature significantly reduces downtime during maintenance and repair operations, making it a practical choice for industries where uninterrupted operation is crucial. For instance, in oil and gas processing plants, quick access for maintenance can be essential to prevent costly production interruptions.

      The side entry design enables technicians to perform necessary repairs or replacements efficiently, ensuring that the valve can be back in operation swiftly. This functionality enhances operational efficiency and minimizes disruptions caused by routine maintenance tasks.

      Efficient Shut-off Capabilities

      With side entry trunnion ball valves, the flow direction is perpendicular to the axis of the valve. This configuration provides efficient shut-off capabilities by allowing a tight seal when closed. As a result, these valves are particularly suitable for applications where reliable shut-off is paramount, such as in critical process control systems within chemical plants or power generation facilities.

      Moreover, this perpendicular flow design also contributes to enhanced performance and longevity of the valve by reducing wear and tear on internal components during frequent opening and closing cycles.

      Key Features of Side Entry Trunnion Mechanisms

      Inline Maintenance

      Side entry trunnion ball valves are designed to allow inline maintenance, which significantly reduces downtime and costs. This means that the valve can be serviced or repaired without requiring it to be removed from the pipeline. By enabling maintenance while the valve remains in place, operations can resume quickly, minimizing disruptions to the system.

      The ability to perform maintenance without dismantling the entire system is a significant advantage for industries where continuous operation is crucial. For example, in oil and gas pipelines, any downtime for maintenance or repairs can result in substantial financial losses. The side entry design addresses this challenge by providing a practical solution for maintaining trunnion ball valves without interrupting operations.

      Stable Operation and Wear Prevention

      Trunnion-mounted balls contribute to stable operation by providing enhanced support and preventing excessive wear on the seals. This unique feature ensures that the valve maintains its integrity even under high-pressure conditions. As a result, these valves are known for their reliability and longevity, making them suitable for demanding applications across various industries.

      In addition to stability, trunnion-mounted balls also reduce friction during operation, contributing to smoother functionality over time. This helps minimize wear on critical components within the valve assembly, further extending its operational lifespan.

      Enhanced Safety with Double Block and Bleed Capability

      Another key feature of side entry trunnion ball valves is their double block and bleed capability. This feature enhances safety by isolating the cavity from the pipeline fluid when performing maintenance or repairs. It effectively prevents leakage or contamination during these procedures, ensuring a secure working environment for personnel while maintaining overall system integrity.

      Comparison with Floating Ball Valves

      Suitability for High-Pressure and Large-Diameter Applications

      Side entry trunnion ball valves are more suitable for high-pressure and large-diameter applications compared to floating ball valves. The trunnion design provides enhanced stability, making it ideal for handling higher pressures and larger pipe sizes. For instance, in a pipeline transporting natural gas at high pressure, a side entry trunnion ball valve would be the preferred choice due to its robust construction and ability to withstand the demanding conditions.

      Trunnion-mounted ball valves also offer enhanced flow control in large-diameter pipelines used in industrial settings. Their sturdy build ensures efficient regulation of gas or liquid flow even under extreme pressure conditions. This makes them indispensable components within critical industries such as oil and gas production, where reliable flow control is paramount to operational safety and efficiency.

      Sealing Performance

      One significant advantage of side entry trunnion ball valves over floating ball valves is their superior sealing performance. The fixed-ball design of trunnion-mounted valves allows for tighter seals, minimizing the risk of leakage even when subjected to high pressures. In contrast, floating ball valves have limitations in achieving comparable sealing effectiveness due to their lighter weight construction.

      • Side entry trunnion valve pros:

      • Ideal for high-pressure applications

      • Better flow control in large-diameter pipelines

      • Enhanced sealing performance

      Advantages of Side Entry Trunnion Valves

      Reliable Bi-Directional Sealing

      Side entry trunnion ball valves are highly regarded for their reliable bi-directional sealing. This means they can effectively control the flow of liquids or gases in both directions, making them suitable for various flow conditions. Unlike floating ball valves that may struggle with achieving a secure seal in high-pressure environments, side entry trunnion valves excel at maintaining tight seals even under challenging conditions. For instance, in oil and gas production where pressure differentials are common, these valves provide the dependable sealing needed to prevent leaks and ensure smooth operation.

      Lower Operating Torque

      One significant advantage of side entry trunnion ball valves is their lower operating torque compared to floating ball valves. The reduced torque requirement translates to lower actuation costs, making these valves an economical choice for businesses looking to optimize operational expenses without compromising on performance. With lower actuation costs, companies can achieve efficient fluid control while keeping maintenance and energy costs in check.

      Applications in Various Industries

      Widely Used

      Side entry trunnion ball valves have various applications across different industries. They are extensively utilized in oil and gas production, refining, and petrochemical sectors. These valves play a crucial role in controlling the flow of fluids and gases within pipelines and processing plants.

      In addition to the oil and gas industry, side entry trunnion ball valves find applications in power generation plants, mining operations, water treatment facilities, chemical processing plants, pulp and paper manufacturing units, marine systems, and more. Their versatility makes them an essential component in ensuring efficient operations across a wide range of industrial processes.


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