May I ask about the valve issue in the flowchart?
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Excuse me, in the flowchart, there are solid valve icons as well as hollow valve icons – which one indicates that the connection is currently active? Thank you:handshake
A solid shape indicates that the valve is open, while a hollow shape indicates that the valve is closed
A solid fill indicates that the valve is in a normally closed state.
I’m confused – two people, two different answers. What should I do?:Q
A hollow shape indicates that the valve is open, while a solid shape indicates that the valve is closed. ——Solid lines are rarely used to represent valves.
HG/T 20505-2014 \"Functional Indicators and Graphic Symbols for Process Measurement and Control Instruments\" includes only hollow valve symbols, with no solid ones.
It depends on how the first page of the flowchart is specified.
HG-T-20519-2009 Unified Specifications for the Content and Depth of Construction Drawings in Chemical Process Design – Part 2, 9. Legend
In flowcharts, valves do not indicate their current state; some are marked as normally open or normally closed, CSO, CSC
I previously saw that process packages had valves that were either hollow or solid, so I asked the person in charge of preparing the process packages, and they said that the solid ones were valves that stay closed.
Solid valves are used on the DCS PLC system screens to indicate the status of valves; hollow valves are generally used in flow diagrams. Valves that are normally open or normally closed are identified by letters – you should look for the common alphabetical abbreviations used in chemical process flows