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Could some expert please explain to me the meaning of each symbol above? Thank you very much
Take a look at the PID diagram; that explanation there
This is the explanation from earlier; I can’t understand it
First image: Based on the valve symbol, it is a pneumatic shut-off valve. h denotes manual, v denotes valve, hs denotes solenoid valve; the control for the solenoid valve is ESD (emergency shutdown), while the others indicate valve position feedback (open or closed). You can take a look at h gt20505-2014
In the first diagram, there is a manual control switch on site that operates this pneumatically controlled valve; the signal from this switch must be sent back to the ESD panel and the DCS. In the second diagram, it shows the motor interlock signals; for their specific meaning, refer to the letter descriptions in the legend, or check the DCS I/O table or the electrical schematic diagram
I’ve read this; I can understand it, but my explanation might not be very clear