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How does a trunnion mounted ball valve work?

Author: Site Editor     Publish Time: 2018-11-03      Origin: Site

The trunnion mounted ball valve closing part is a ball, and the ball rotates around the center line of the valve body to open and close a valve. The trunnion mounted ball valve which is  provide a trunnion mounted ball valve with reasonable design, firm structure, high sealing performance, effective operation torque reduction and long service life.


List of content for this article:

l  The working principle of the trunnion ball valve installed during the opening process

l  Advantages of trunnion ball type industrial valve 

How does a trunnion mounted ball valve work

The working principle of the trunnion ball valve installed during the opening process:


1. In the closed position, the ball is pressed by the mechanical pressure of the valve stem and pressed against the valve seat.


2. When the handwheel is turned counter clockwise, the valve stem moves in the opposite direction, and the bottom angular plane causes the ball to disengage from the valve seat.


3. The valve stem continues to lift and interacts with the guide pin in the screw groove of the valve stem, causing the ball to start rotating without friction.


4. Until the fully open position, the stem is raised to the extreme position and the ball is rotated to the fully open position.  

Advantages of trunnion ball type industrial valve  

The trunnion mounted ball valve  locking structure includes a lock nut disposed outside the valve body, and a cylindrical pin is disposed between the valve stem and the valve body, the radial contact between the valve stem and the valve body With retaining ring. The ferrule structure comprises a ferrule nut disposed at an outer end of the ball valve joint, and the ferrule nut is symmetrically provided with a front ferrule and a rear ferrule.


The trunnion mounted ball valve disposed between the ball valve joint and the spherical valve core, and the valve seat sleeve is provided with a sealing structure, and a butterfly spring is disposed between the valve seat sleeve and the valve body. The valve stem and the handle are connected by a set screw that is threaded into the handle. Compared with the prior art, the present invention has the advantages of reasonable design, firm structure and high sealing performance, which can effectively reduce the operating torque and prolong the service life.


The fluid resistance is small, and its resistance coefficient is equal to the pipe length of the same length. The structure is simple, small in size and light in weight.It is close and reliable. At present, the sealing surface material of the ball valve is more commonly used in plastics and has good sealing performance. It has also been used more frequently in vacuum systems.


The operation is convenient, the opening and closing is rapid, and the rotation is 90° from full opening to full closing, which is convenient for long-distance control.The maintenance is convenient, the ball valve has a simple structure, and the sealing ring is generally movable, and the disassembly and replacement are relatively convenient.When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium does not cause erosion of the sealing surface of the valve.


Wide range of applications, from small to a few millimeters, up to a few meters, from high vacuum to high pressure can be applied. When the ball is rotated 90 degrees, all the spheres should appear at the entrance and exit.


The industrial ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the medium. Ball valves are a new type of industrial valve that has been used more and more in recent years.


The above is the opening process of trunnion mounted ball valve. We are a manufacturer of trunnion tomunted ball valve and ball valve related products. If you are interested, you can consult us on the official website.


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