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What is the difference between floating and trunnion mounted ball valve?

Author:Site Editor     Publish Time: 2018-11-01      Origin:Site

The ball of the floating ball valve is floating. Under the action of the medium pressure, the ball can generate a certain displacement and press on the sealing surface at the outlet end to ensure the sealing of the outlet end.


The floating ball valve is small in size, light in weight, simple in structure and good in sealing. However, the load of the ball subjected to the working medium is transmitted to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the spherical medium.

Here are the content list:

  1. Floating ball valve features and performance

  2. Trunnion mounted ball valve features and performance

  3. The basic difference between a trunnion type ball valve and a floating ball valve



What is the difference between floating and trunnion mounted ball valve     What is the difference between trunnion mounted and floating ball valve

A. Floating ball valve features and performance


Small in size, light in weight, simple in structure, the ball has a free floating function, which can better ensure the sealing; the industrial ball valve use a ball with a circular through hole as the opening and closing member, and the ball is driven around the center of the valve stem by the valve stem 90 degree rotation, complete the opening and closing function; has the characteristics of compact structure and rapid switch, turn 90 degrees, can close the valve, cut off the pipeline medium; the diameter of the ball passage is the same as the diameter of the pipeline, the flow resistance is small, the flow capacity is large; The rod is a bottom-loading type, which eliminates the accident of the valve stem and ensures the safety of use.



The ball of the trunnion mounted ball valve is trunnion mounted and does not move after being pressed. The trunnion mounted ball valve has a floating valve seat. After the medium pressure, the valve seat moves, so that the sealing ring is pressed against the ball to ensure the seal. Usually mounted on the upper and lower shafts of the ball, the operating torque is small, suitable for high pressure and large diameter valves.


B. Trunnion mounted ball valve features and performance


The trunnion ball valve is suitable for various medium and high pressure pipelines. It is used to cut off or connect the medium in the pipeline. Different materials can be used for water, steam, oil, liquefied gas, natural gas, gas, nitric acid and acetic acid. , oxidizing medium, urea and other media, widely used in petrochemical power and water conservancy and other industries. Common driving methods for trunnion mounted ball valves are worm gear, manual, electric and pneumatic. Most trunnion mounted ball valves are flanged, but there are also trunnion mounted ball valves in welded form.


The basic difference between a trunnion type ball valve and a floating ball valve is:


a. Floating Ball Valve - The spool ball is free to rotate between the two seat seals by means of the valve stem.


b. trunnion mounted Ball Valve - The spool ball is connected to the valve stem and rotates in the center of the valve stem, with a floating ball and a ball valve with a flexible movable sleeve seat.

The ball of the floating ball valve is floating. Under the action of the medium pressure, the ball can generate a certain displacement and press on the sealing surface at the outlet end to ensure the sealing of the outlet end.


The ball of the trunnion mounted ball valve is trunnion mounted and does not move after being pressed. The trunnion mounted ball valve has a floating valve seat. After the medium pressure, the valve seat moves, so that the sealing ring is pressed against the ball to ensure the seal. Usually mounted on the upper and lower shafts of the ball, the operating torque is small, suitable for high pressure and large diameter industrial valves.


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