Determine the meaning of each symbol in this diagram
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What do Z50, PVZ, PVX, PVY, and PVZZL represent in the diagram? Seek advice from experts
Take a look at the functional indicators and graphic symbols for process measurement and control instruments in HG/T 20505-2014
Regarding the gauge legend, to understand what it means specifically, check the legend and the index table of the gauges for detailed descriptions.
①Z50: It should be an interlock logic number within ESD. This number should be available in the ESD logic set. ②PVZ: Feedback on the extreme positions of the pressure control valve (fully open, fully closed). ③ZL: refers to the signal indicating that the valve is in the closed position, and it is used to be sent to the Z50 interlock logic in the ESD. ZAL: It should refer to the need for an alarm to be triggered after the valve is closed. ④PVZZL: It is the position switch that indicates when the valve is in its closed position. ⑤PVY/PVZ: It should be the positioner and solenoid valve.
Z50: The serial number in ESD； PVZ: Pressure regulating valve with limitation ； PVX: Pressure control valve positioner ； Solenoid valve of the PVY pressure control valve ； PVZZL: Low limit position of pressure control valve