Trunnion mounted ball valve vs floating ball valve

Production of Industrial Valve s. Request More Information. An advantage of trunnion ball design over floating ball is the lower operating torque of the ball. This is particularly advantageous when the ball valve is actuated because it reduce the size of the actuator and hence the overall costs of the valve actuation. The functional difference between trunnion mounted ball valves and floating ball valve designs involves the operating pressure characteristics, with trunnion styles having better sealing for low pressure applications because they are not relying on system pressure to aid with sealing.

As the ball of the floating ball valve is floating , so under the pressure of the medium, the floating ball will move and against the downstream seat.

The ball of the trunnion ball valve cannot be move so the two sides of the trunnion ball valve both must be sealed. A trunnion mount ball valve can also be advantageous for applications employing valve automation. Since the ball is not held in place by a tight fitting seal arrangement, operating torque tends to be lower for comparably sized trunnion mount valves , when compared to floating ball valves. On of the brochure included below, the exploded. The key difference beteween a floating ball valve and a trunnion mounted ball valve is how each achieves a line seal.

The floating ball valve only has upper stem and the ball can have a slight displacement, so it is called floating ball valve. The trunnion ball valve ball has another stem at the bottom to fixed the position of the ball ,so the ball can’t move. In my opinion you should decide for a trunnion starting with class 600.

A free-floating valve is known as a floating type whereas a fixed type valve is known as a trunnion mounted valve. Floating Ball Valve In a floating ball valve , the ball is held in the position by the compression of the two elastomeric seats against the ball. In a floating valve , the ball is suspended in the flowing fluid and is kept in position by the compression of two elastomeric seats against it.

The shaft is connected at the top of the ball and allows the switch from an open to a closed position with a quarter turn movement (degrees). When one talks about floating ball valves , most people think of a valve with fixed seats and a floating balls usually smaller valves inrelatively low pressures systems. However, when it comes to tightness, floating ball valves are mor reliable than trunnion ball valves. Similar to the valve illustrated in fig. What is the plural of trunnion?

For floating ball valve , the sealing force of valve seat and the sealing pressure are greatly influenced by changing medium pressure. Too high pressure may damage the valve seat. Trunnion Ball Valve There are two kinds of sealing structure of trunnion ball valve : entrance sealing and exit sealing. The fixed shaft is installed in upper and lower. Trunion mounted ball valves are uses a. MVS Trunnion Mounted Ball Valve is the result of Innovative engineering.

It embodies all the quality, Performance, value and safety features required for critical applications. In Trunnion Mounted Ball Valve , the ball rotates without moving on the horizontal axis, where as seats are floating and free to move on the same axis. The operating characteristics are similar for all trunnion - mounted ball valves.

The body of the valve is the casing that holds and protects the internal parts of a trunnion mounted ball valve.

However, all other SCV Valve API 6D products are built to this standard and can be 3rd party tested and certified upon request. SCV Valve manufactures some of the most dependable cast and forged steel Ball Valves in the industry. Our products are manufactured and tested in accordance with respective API, ASME, and ANSI standards.