At what pressure drop upstream and downstream of the valve in the pipeline is it necessary to install a flow-limiting orifice plate?
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HG20570 states that when there is a significant pressure drop upstream and downstream of a valve in a pipeline, in order to reduce the erosion of the valve by the fluid, an orifice plate can be connected in series upstream of the valve, provided that throttling through the orifice plate does not result in the formation of a gas phase. Question: What pressure drop is required upstream and downstream of the valve in the pipeline to install a flow-limiting orifice plate? Is there a relative range?
This process section might be more suitable to help you transfer there: @*lihuagong @ValveMingMing @ZhiZheMing @XueHaiYouZi @great.wang @1573
I haven’t seen a specific range specified; usually, a flow-limiting orifice plate is installed on the return pipeline at the pump outlet. Additionally, the selection is made based on the following criteria:
If you don’t use a pressure reduction orifice plate, where do you plan to place the pressure drop? If the valve has to overcome too high a pressure drop, its regulating performance will be poor. As a general guideline, the pressure drop across the control valve should account for about 1/3 of the total system pressure drop. If the resistance loss across the valve exceeds 2/3 of the total pressure drop, then it is advisable to consider using pressure-reducing or pressure-increasing orifices.