How Plug Valves Work

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This 3D animated video explains how a plug valve works, its main components, advantages, disadvantages and its applications. We use animation to show the valve moving from the open to close position and vice versa.

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▶️Introduction
Plug valves obtain their name from the type of valve disc used. Plug valves are ¼ turn valves and are suitable for stopping and starting flow. Plug valves are not suitable for throttling/regulating flow although there is a diamond port design that is suitable for throttling applications.

Plug valves are available in lubricated or non-lubricated designs.

Operation
The plug of the valve has a hole drilled through the middle, or a rectangular shape bored through the middle. When the bored hole is in line with the valve body and connected piping, the valve is in the open position. When the bored hole is perpendicular with the valve body, the valve is in the closed position. The handle (actuator) indicates the position of the valve (in-line = open, perpendicular = closed).

Advantages
The plug valve is well suited for multiport applications. Three way valves are often of the plug valve design.
The pressure drop through the full bore plug valve is very low, but the rectangular hole plug valve is slightly higher as only 70% of the piping cross sectional area passes through the valve.
The plug valve is fast acting (all ¼ turn valves are).

Disadvantages
The plug valve is poorly suited to throttling applications.
The plug valve seat is often constructed from plastic or polymer materials, this makes the valve ill suited to high temperature applications.

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[savree-d]

Want to continue learning about engineering with videos like this one? Then visit:

Want to teach/instruct with the 3D models shown in this video? Then visit:

[arunparameswari]

Thanks for the video, it's really useful. And the animation took me to that component.

[cancatalcal]

Thanks, great animation and presentation.

[schamberlain]

I work at a caustic chlorine plant in Louisiana, we use a lot of plug valves in the caustic unit. We use a lot of plug valves as control valves also. Mainly tuf-line and durco brands. They work pretty well as control valves in certain applications

[WILDXD]

I don't know where you got your info, but plug valves can be and are regularly used in throttling actions.

[thomasfranche]

So, the only major difference that I can see between the Plug Valve and the Ball Valve is that the Plug Valve is suitable for multi-directional flow. Is that right ?

[quinnmath]

if its leaking, Lubcicate and adjust the valve

[nikstvs]

but why a ball valve isnt also suitable for multi applications like a plug valve?

[cypher]

Can't understand the reason of low pressure drop