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Process Operation Technology

Oil, gas and petrochemical process industries


    Talib Al_Munawri

    Posts : 337
    Join date : 2009-07-03
    Age : 30
    Location : Sultanate of Oman


    Post by Talib Al_Munawri on Thu Sep 17, 2009 9:53 pm


    This type of valve is opened or closed by a ball. Like the plug and
    gate valves, the ball valve is used only in the fully open or fully
    closed position. The ball has a hole through the centre which is the
    same size as the valve ports in the valve body. The valve moves from
    the fully open position to the closed position by moving the valve
    handle a quarter of a turn.

    The position of the valve handle indicates whether the valve is
    fully open or fully closed. When the valve handle is pointing in
    the direction of the pipe the valve is in the fully open position.
    When the valve handle is pointing across the pipe the valve is
    in the fully closed position.

    The ball is carefully machined so that it fits exactly into the
    valve seats. It gives a very tight shut off with metal to metal
    seal. Ball valves are very good when they are used in gas processes
    at high and low pressures and temperatures.

      Current date/time is Fri Jan 19, 2018 8:31 am