This Control Valve Symbols Legend CAD sheet helps standardize valve notation on P&ID and process schematics. It covers common control valve bodies, actuator types, and fail-action symbols so reviewers, operators, and contractors can interpret your drawings quickly and consistently.
Symbols included (typical)
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Control valve (generic)
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Globe control valve
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Diaphragm control valve
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Butterfly control valve
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Angle control valve (common variants)
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Three-way control valve
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Deluge control valve
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Wing valve
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Double Block & Bleed (DBB) valve
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Float valve
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Self-contained pressure regulator
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Back pressure regulator
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Motor operated valve (MOV)
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Hand control valve (without motor)
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Cylinder / piston actuator and actuated valve types
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Control valve with positioner
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Fail action symbols: Fail Close (FC) and Fail Open (FO)
Why this legend is useful
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Keeps valve symbols consistent across multiple P&ID sheets
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Reduces miscommunication between design, construction, and operations
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Speeds up drafting by reusing a clean symbol set
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Improves QA/QC because fail-action and actuation are clearly shown