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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 10:15 pm


    A globe valve is used to control the amount of flow. The valve can
    be operated in any position from the fully closed position to the
    fully open position. The valve disc is globe shaped (circular).
    The valve operates by raising and lowering the valve disc into
    a circular seat. There is no contact between the seat and disc
    ends when the flow through the valve starts. Only a few turns of
    the handwheel are needed to fully open or close the valve.
    (The gate valve needs many turns to open or close it.)

    There are partitions inside a globe valve. The fluid flowing
    through the valve must make two 90 degree turns. The flow is
    "under and over" to prevent wear to the seat. Therefore, there is
    a high pressure drop in the valve. It is easier to control this
    kind of flow.

    Globe valves are usually smaller if they are hand controlled and
    need to be opened and closed often. The direction of the fluid
    flow through the valve keeps the seat and disc clean.

      Current date/time is Mon Mar 19, 2018 11:49 pm