Valve Knowledge: Ball Valve

 Ball valves and plug valves belong to the same type of valve, its closing piece is a sphere, the sphere around the center line as a rotary valve to achieve the open, close a valve. Valve in the pipeline is mainly used to do cut, distribution and change the direction of media flow.



    Ball is widely used in recent years, a new type of valve, it has the following advantages:

    1. Fluid resistance is small, the drag coefficient with the same length of pipe equal.

    2. Simple structure, small size and light weight.

    3. Close and reliable valve sealing surface material is currently widely used in plastic, sealing well, in the vacuum system has also been widely used.

    4. Easy to operate, opening and closing rapidly, from fully open to fully closed as long as the rotation 90 °, to facilitate remote control.

    5. Easy maintenance, valve structure is simple, seals are generally activities, and demolition are relatively easy to replace.

    6. In the fully open or fully closed, the ball and valve seat sealing surface and the dielectric isolation, medium passed, will not cause the erosion of the valve sealing surface.

    7. Wide application and a few millimeters diameter from small to large as a few meters from the high vacuum to high pressure can be applied.

    Ball has been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rockets and other departments, as well as people's daily life.

    Ball valve according to structure can be divided into:

    A floating ball valve

    The sphere is a floating ball valve in the medium under pressure to produce a certain degree of displacement of the sphere, and pressed in the export side of the sealing surface to ensure that the export side seal.

    Floating ball valve of simple structure, good sealing, but the ball to bear the load all the working medium to pass the export ring, so to consider the ring material can withstand the work load of the sphere medium. This structure is widely used in the low-pressure valve.

    2, fixed ball valve

    The ball valve is fixed, the pressure does not produce after the move. Fixed ball valve comes with a floating valve seat, by the medium pressure, the seat produce movement, so that pressed the ball on the ring to ensure sealing. Usually with the sphere of the upper and lower shaft bearings, operating torque is small, applied to high pressure and large-diameter valve.

    In order to reduce torque and increase the operation of valve sealing reliability of the valve seal has emerged in recent years, both in injection pressure between the sealing surface of a special lubricant, to form a layer of film that enhances the tightness, but also reduce operating torque, more suitable for large-diameter high-pressure valve.

    3, elastic ball valve

    The ball valve is flexible. Ball and valve seat ring are the use of metal materials, sealing pressure than the large, relying on media itself can not seal the pressure has reached the requirements to be imposed by external force. Such valves for high temperature and pressure medium.

    Elastic sphere is the sphere wall to open the bottom of an elastic groove, and get flexible. When the closed channel, with the stem of the wedge-shaped head to compress the sphere rose up to open with the valve seat seal. In the sphere before turning loose wedge head, ball the subsequent restoration of the original prototype, so that sphere with a small gap between the valve seat, sealing surface can reduce friction and operating torque.

    Valve according to their channel positions can be divided into straight-through processing, three-and right-angle type. After two kinds of ball valves for the distribution media and change the flow of media. 

 

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