Motor Operated Valve Symbol

What is a motor-operated valve symbol?

A motor-operated valve (MOV) symbol is the graphical representation of a valve with an electric motor actuator. In P&ID diagrams, it shows that the valve’s opening and closing are controlled electrically rather than manually.

How is a motor-operated valve shown in a P&ID?

The symbol combines the standard valve body graphic with an actuator symbol above it, typically a circle or box with an “M” inside. This indicates that the valve is driven by a motor. Additional annotations may specify voltage, control method, or fail-safe position.

What types of motor-operated valve symbols exist?

The representation can vary depending on the function:

• On/Off MOV – Indicates fully open or closed positions.
• Throttling MOV – Shows adjustable flow control.
• Fail-safe MOV – Includes details on whether the valve closes or opens automatically during power loss.

What is the difference between a motor-operated valve and a manual valve in P&ID?

• Motor-operated valve (MOV): Includes an actuator symbol, showing that movement is powered electrically.
• Manual valve: Depicted without actuator markings, operated directly by a handwheel or lever.

Do MOV symbols differ across ISO, ISA, or ANSI standards?

Yes, the basic concept remains the same, but line styles, actuator shapes, and labeling may differ between standards. Projects should always confirm whether ISO 14617, ISA S5.1, or company-specific symbols are being used.

Where are motor-operated valves commonly used?

Motor-operated valves are widely used where remote operation, automation, or safety interlocks are required, such as:

• Oil & gas pipelines
• Power plants
• Chemical processing
• Water treatment systems

Where can I find motor-operated valve symbols for CAD and P&ID design?

ISO-compliant motor operated valve symbols are available in Capital X Panel Designer's Symbol Library. These ready-to-use symbols improve accuracy, ensure compliance, and save time when creating P&ID drawings.

Skip Drawing Motor-Operated Valve P&ID Symbols With Capital X Panel Designer!

With so many different types of valve symbols to choose from, it can be difficult to manually draw each and every one. With Capital X Panel Designer, you can skip the process entirely by simply browsing through our library of pre-made symbols and then dragging and dropping the ones you need into your schematic. This easy-to-use CAD software will provide a huge boost to your workflow.

Learn more about how to create electrical symbols now.