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Difference between trunnion and floating ball valve

Author:Site Editor     Publish Time: 2018-11-08      Origin:Site

The floating ball valve is small in size, light in weight and simple in structure. The ball of the floating ball valve has a free floating function, which can better ensure the sealing; the ball can be freely rotated in the seat sealing ring by means of the valve stem.

Here is an outline:

  1. The principle of floating ball valve and trunnion mounted ball valve:

  2. The characteristics and performance of floating ball valve and trunnion mounted ball valve

 

A.The principle of floating ball valve and trunnion mounted ball valve:

 

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.

 

B. The characteristics and performance of floating ball valve and trunnion mounted ball valve

The floating ball valve is small in size, light in weight, simple in structure, and the ball has a free floating function, which can better ensure the sealing; the ball valve uses a ball with a circular through hole as the opening and closing member, and the ball surrounds the center of the valve stem under the driving of the valve stem It is rotated from 0 to 90 degrees to complete the opening and closing function. It has the characteristics of compact structure and quick switch. When the rotation is 90 degrees, the valve can be closed and the pipeline medium can be cut off. The diameter of the sphere passage is the same as the diameter of the pipeline, the flow resistance is small, and the circulation capacity is large. The valve stem is a bottom-loading type, which eliminates the accident of the valve stem and ensures the safety of use.


The trunnion mounted 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.


Simply put, the difference between a trunnion mounted 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.


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