Regarding the issue of the diameter ratio of the flow orifice plate
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Dear colleagues: Regarding flow orifice plates, our company’s engineering regulations stipulate the following: “The orifice diameters shall be designed such that the ratio of orifice diameter to line diameter (Bata ratio, d/D) is between 0.2 and 0.7 in the indicator loop, and between 0.3 and 0.7 in the control loop.” What does “in the indicator loop” and “in the control loop” mean respectively? ?
in indicator loop: an indication circuit that does not participate in regulation. in control loop: The control loop, which together with the regulator and control valve forms a closed-loop control system.