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Process Flow Diagram Symbols – Valves

Piping codes and standards


Gate valve
is a device used to control the flow of liquids and gases.
Check valve
also known as one-way valve, is to prevent the line of medium back.
Globe valve
is a mechanism used to control or stop the flow of liquid or gas through a pipe.
Ball valve
is a valve with a spherical disc, the part of the valve which controls the flow through it.
Butterfly valve
is installed between two flanges using a separate set of bolts for each flange.
Angle valve
is oriented at an angle 90 deg of gate valve.

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