Solving problems in PID diagrams – a beginner’s guide
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What do the letters UY, UV, ZSC, ZAC, ZSD, ZAD, FC-TSD on a pneumatic control valve mean?
Learn about the functional indicators and graphic symbols for process measurement and control instruments as specified in HG/T 20505-2014
Each set of PID drawings includes a title page that provides detailed explanations of all the symbols and codes used in those drawings. Due to the different standards and practices followed by various design institutes, referring to this explanation helps to understand related issues more accurately.
UY UV ZSC ZAC ZSD ZAD FC-TSD – these represent the most useful PID legend symbols; they are typically indicated as follows for reference: UY: Solenoid valve; UV: On/off valve; ZSC: Signal indicating closure; ZAC: Signal showing closure within the system; ZSD: Please refer to the legend; ZAD: Please refer to the legend; FC-TSD: Valve failure closure, complete shutdown
Go to the homepage image corresponding to the flowchart; there, the initial letters and the letters that follow them indicate their meanings
In UY UV ZSC ZAC ZSD ZAD FC-TSD, the last parts ZSD ZAD FC-TSD should be ZSO ZAO FC-TSO instead