The principle and function of restrictor orifice plate
As a throttling element, due to the advantages of simple structure, easy processing, low manufacturing cost, convenient installation, etc., under the premise of meeting the process requirements, the use of restriction-type orifyplate instead of regulating valve to limit flow or reduce pressure will greatly reduce investment and operation and maintenance costs, so it has been widely used in process equipment abroad. It plays an important role in the safe operation of the device.
Current limiting orifice principle:
Restrictor orifice plates are used to limit the flow of fluid or reduce the pressure of fluid. The pressure drop occurs when the fluid passes through the orifice, and the flow rate through the orifice increases with the increase of the pressure drop. However, when the pressure drop exceeds a certain value, that is, when the critical pressure drop is exceeded, no matter how the outlet pressure is reduced, the flow rate will maintain a certain value and no longer increase. The restrictor orifice is used to limit the flow of the fluid or reduce the pressure of the fluid according to this principle.
Current limiting orifice classification:
The restrictor orifice plate is divided into single orifice plate and porous plate according to the number of holes on the orifice plate. According to the number of holes can be divided into single stage and multi-level.
Current limiting hole material:
Standard materials include 316 stainless steel, 304 stainless steel, 310 stainless steel, Hastelloy C276, Hastelloy B3, duplex stainless steel, super duplex stainless steel, Monel 400, carbon steel, titanium, nickel 600, tantalum, PTFE and PVDF, etc. Other special materials can be customized.
Current limiting orifice function:
1. Occasions where process materials need to be depressurized;
2, in the pipeline valve, downstream need to have a large pressure drop, in order to reduce the fluid erosion of the valve, when the orifice throttling does not produce gas phase, can be connected in the upstream of the valve orifice;
3, where the fluid needs a small flow and continuous flow, such as the flushing pipe of the pump, the bypass pipe of the hot standby pump (low flow protection pipe), the analysis sampling pipe and other places;
4, where depressurization is needed to reduce noise or wear, such as blow-off systems.
