Seeking diagram symbols for automatic valves
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It is the automatic fire spray control valve located at the top of the loading/unloading nozzles for liquid ammonia; it is controlled by instrument air and is linked to the alarms from the gas detectors – water spray is activated automatically when ammonia is detected. How should this control valve be represented in the process flow diagram?
This is similar to a chain; it’s a logical relationship. You can first download \"HG/T 20505-2014 Functional Indicators and Graphic Symbols for Process Measurement and Control Instruments\" to take a look.
Piping and flow diagrams with control points are prepared jointly by the process engineering team and the instrumentation team; you can consult the instrumentation team for assistance
In the diagram, simply connect the control valve and the alarm with straight lines – this is the simplest control circuit.
Hehe, thank you all! I’ve also checked HG/T 20505-2014; I’m not sure if PSV is the correct notation to use :)