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What is the difference between Floating Ball Valve and Trunnion Mounted Ball Valve

Views:0     Author:Site Editor     Publish Time: 2020-07-28      Origin:Site

1. Principles of Floating Ball Valves and Trunnion Mounted Ball Valves:


The ball of Floating Ball Valves is floating. Under the action of the medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the seal of the outlet end.

The ball of Trunnion Mounted Ball Valves is Trunnion, and will not move when pressed. Trunnion ball valves are equipped with a floating valve seat. After receiving the pressure of the medium, the valve seat will move to make the sealing ring tightly press on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the sphere, and the operating torque is small, which is suitable for high pressure and large diameter valves.


2. Features and performance of Floating Ball Valves and Trunnion Mounted Ball Valves


Floating Ball Valves are small in size, light in weight and simple in structure. The ball has a free floating function, which can better ensure the seal; the ball valve uses a ball with a circular through hole as an opening and closing part, and the ball surrounds the stem under the drive of the valve stem The center rotates from 0 to 90 degrees to complete the opening and closing function; it has the characteristics of compact structure and rapid opening and closing. The valve can be closed by 90 degrees and the pipeline medium can be cut off. The diameter of the sphere channel is the same as the diameter of the pipeline, with small flow resistance and flow capacity. Large; the valve stem is a bottom-mounted type, which prevents accidents of the valve stem from passing out and ensures safe use.


Trunnion Mounted Ball Valves are suitable for various medium and high pressure pipelines. They are used to cut off or connect the medium in the pipeline. Different materials are used. They can be used for water, steam, oil, liquefied gas, natural gas, coal gas, and nitric acid. , Acetic acid, oxidizing media, urea and other media are widely used in petrochemical, power, water conservancy and other industries. The common driving methods of Trunnion Mounted Ball Valves are worm gear, manual, electric and pneumatic. Most Trunnion Mounted Ball Valves are flanged, but there are also welded Trunnion Mounted Ball Valves.

Simply put, Trunnion Mounted Ball Valves and Floating Ball Valves are roughly different in:


a.Floating Ball Valves——The valve core ball rotates freely between the two valve seat sealing rings by means of the valve stem.

b.Trunnion Mounted Ball Valves——The valve core ball is connected with the valve stem and rotates at the center of the valve stem. It is a ball valve with floating ball and elastic movable sleeve seat.


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