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English: The vector graphic contains SVG renditions of groups 21-25 of ISO 10628-2:2012(en), "Diagrams for the chemical and petrochemical industry — Part 2:Graphical symbols". The groups are: 21: valve 22: check valve 23: valves and fittings with safety functions 24: fittings 25: graphical symbols for piping Links to all sheets in the set:
A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. [1] Check valves are two-port valves, meaning they have two openings in the body, one for fluid to enter and the other for fluid to leave. There are various ...
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A diagram which shows the interconnection of process equipment and the instrumentation used to control the process. In the process industry, a standard set of symbols is used to prepare drawings of processes. The instrument symbols used in these drawings are generally based on International Society of Automation (ISA) Standard S5.1
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This symbol is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Redrew jpg as svg. The original can be viewed here: Check valve.jpg: File:Check valve.jpg. Modifications made by Gregors.