This Valve Symbols Legend CAD sheet helps you create clear, consistent P&ID and piping schematics. It includes common valve types and typical symbol variations used in engineering drawings—useful for design, shop drawings, and coordination.
Symbols included in this legend
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Ball valve (open / close)
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Gate valve (open / closed) + gate valve (parallel slide)
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Globe valve (open / close) + standard globe valve
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Plug valve
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Butterfly valve
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Check valve (standard + variations such as piston type and disc type)
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Angle valve, three-way valve, needle valve
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Choke valve (fixed / adjustable)
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4-way flanged valve
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Foot valve with strainer
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Pressure reducing valve (PRV), pressure/vacuum valve
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Relief valve
Why it’s useful
A consistent valve symbol legend reduces drawing mistakes and makes your P&ID easier to read for reviewers, contractors, and operators.