Differences between floating ball valve and trunnion ...

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Understand the Key Differences Between Floating Ball Valves and Trunnion Ball Valves

1. Distinct Structural Designs

In a floating ball valve configuration, the ball is positioned such that it can be pushed against the downstream seat due to in-line pressure, thereby ensuring a tight seal. While transitioning from the closed to open state, the ball must rotate against both the in-line pressure (p) and the seat friction. In contrast, a trunnion-mounted ball valve features the ball fixed within the assembly via a central lower shaft known as the trunnion. This arrangement keeps the ball stable between the valve stem and the trunnion, thereby eliminating the floating mechanism. Consequently, the in-line pressure applies force to the seats compressing against the ball, which simplifies operation, enabling the ball to rotate with less resistance against only the seat pressure.

2. Distinct Application Advantages

Trunnion-mounted ball valves are particularly advantageous for high-pressure situations and larger diameter requirements, making them suitable for demanding applications. An added benefit of the trunnion style is the inclusion of a drain or bleed connection, which enhances safety features. This design functions as an automatic relief system, releasing excess pressure in the central cavity when it surpasses the spring force of the seats. Such a mechanism effectively drains extra pressure back into the main line, which is crucial in industries like oil and gas where extreme conditions are commonplace. Conversely, floating ball valves are generally less expensive, predominantly utilized in situations where high performance is not a stringent requirement.

Metal Seated Ball Valve: A Comparative Overview

When selecting a metal seated ball valve, it is crucial to evaluate the operational needs, as both floating and trunnion designs offer distinct advantages. While floating ball valves can provide a compact structure and effective sealing properties, they are often limited to smaller applications. Conversely, trunnion ball valves are engineered for greater durability and lower operational torque, making them more suitable for high-pressure environments.

Choosing Between Floating and Trunnion Ball Valves for Severe Service

In making a decision regarding which valve type to utilize for severe service applications, several factors warrant consideration. Cost will likely be a significant factor; floating ball valves are typically priced lower than trunnion options due to their simpler construction. However, it is important to assess the specifics of your application. Given that floating ball valves usually require higher torque when under pressure, trunnion-mounted valves may prove more efficient in high-pressure scenarios, offering users increased operational ease.

Reliable and Durable Ball Valves for Your Needs

For those seeking high-quality ball valves designed for rigorous service, consider collaboration with industry leaders like Copeland Valve. Our experience in valve manufacturing ensures that we deliver innovative and reliable solutions tailored to your requirements. Our dedication to quality and swift service means you can trust us for both standard and custom valve solutions.

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