Therefore, the smaller the beta ratio, the higher the differential pressure generated. A beta ratio of 0.6 therefore exhibits that the orifice bore diameter is 60% of the pipe inside diameter. In general, an orifice plate will typically exhibit a bore diameter between around 30 to 75% of the pipe inside diameter. The differential pressure created is related to the beta ratio (β) of the orifice plate where the beta ratio is the ratio of orifice bore diameter / inside pipe diameter (d/D). What happens when fluid flows through an orifice plate? In simple terms, when the fluid flowing in a pipeline passes through an orifice plate, the fluid velocity increases through the reduced orifice area and develops a differential pressure across the orifice device. ![]() Orifice plates are mainly used to achieve restricted or controlled flow of a process fluid. ![]() An orifice plate is essentially a disc with a central aperture which is inserted into a pipeline between a pair of flanges.
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