Symbols and valves in the process flow diagram
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I would like to ask: if an electric valve is controlled by different parameters from three devices, such as the temperature of device A, the pressure of device B, and the temperature of device C. In the pID diagram, how is this valve represented?
And what does this represent in the PID diagram?
"YY” is a multi-variable control block; the notation may vary in different diagrams. “I” represents interlocking… Can’t we check the diagram on the home page?
HGT 20505-2014 Functional indicators and graphic symbols for process measurement and control instruments
Check the regulations on the depth of engineering design documents for automatic control specialties (HG/T 20638)
Generally, it depends on the image on the homepage; the principles are more or less the same, but some details can vary from one design firm to another