![]() ![]() The examples in Crane are for this type of orifice. ![]() ![]() This is called the overall pressure drop. However, when you are trying to restrict the flow you are interested in the pressure differential relatively far away from the plate - maybe 2 diameters upstream and 10 diameters downstream. Examples of this are corner taps, flange taps or D and D/2 taps. In this case the pressure differential is measured very close to the orifice plate. It seems from your numbers that your orifice fits into the first category - i.e. The one is as a flow element to be able to measure the flow rate, and the second is to add resistance into the system to restrict the flow. Orifices are used for 2 entirely different purposes. Carbluff, the missing critical piece of information is where you are measuring the pressure differential. ![]()
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