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I. Principles of floating type vs trunnion ball valve :

The sphere of floating ball valve is floating. Under the action of medium pressure, the sphere can produce certain displacement and press tightly on the sealing surface of the outlet to ensure the sealing of the outlet.

The ball body of the trunnion mounted ball valve is fixed and does not move after being pressed. Fixed ball valves have floating seats. When it is subjected to medium pressure, the valve seat moves and the sealing ring is pressed on the sphere to ensure sealing. Usually, bearings are installed on the upper and lower axles of the sphere, and the operation torque is small. It is suitable for high pressure and large caliber valves.

II. Characteristics and performance of trunnion ball valve vs floating ball valve Ball valve floating type differs. But the overall characteristics are small size, light weight, simple structure, sphere with free floating function to better ensure sealing. The ball valve uses a ball with a circular through hole as the opening and closing part, which rotates 0-90 degrees around the center of the stem under the drive of the valve stem to complete the opening and closing function. It has the characteristics of compact structure and fast switching. It can turn 90 degrees to close the valve and cut off the pipeline medium. The diameter of the spherical passage is the same as the diameter of the pipeline. The flow resistance is small and the flow capacity is large. The valve stem is downloaded, which prevents the accident of the valve stem penetration and ensures the safety of use.

Trunnion mounted ball valves are suitable for various pipelines of medium and high pressure. They are used to cut off or connect medium in pipeline. Different materials are selected. They can be applied to water, steam, oil, liquefied gas, natural gas, gas, nitric acid, acetic acid, oxidizing medium, urea and other media respectively. They are widely used in petrochemical industry, electric power, water conservancy and other industries. The common driving modes of trunnion mounted ball valves are worm wheel drive, manual, electric and pneumatic. Most trunnion mounted ball valves are flanged, but there are also trunnion mounted ball valves in welded form.

Simply, the difference between trunnion mounted ball valve and floating ball valve is that:

A. Floating ball valve - Spherical ball rotates freely between two seat seals by means of the stem.

B. Trunnion Mounted Ball Valve - The spool ball is connected with the stem and rotates in the center of the stem with a floating ball and an elastic sleeve seat.、

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