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Orifice Flange Installed in a closed pipeline, orifice flange is used to test the flow rate of fluid, gas and steam just like a throttling gear. Standard orifice plate is a metal plate with a round hole. Round-hole wall is perpendicular to the front face of orifice plate. During installing, axis of the plate and the related pipe should be concentric. The orifice flange is fastened on a pipe through a pair of lugs on it. The flange consists of a plate with a hole in center, a metering device and square margin and Jack screws, which are very easy to dismantle. Two pressure taps are respectively