Control Valve Failure Mode (Fail Lock | | Fail last DC | Fail Last DO | FC | FO Modes included)

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What is Fail Open control valve ?

Fail Open control valve is a control valve that has have Air to Open Actuator and valve body design and Flow under the valve to assist failure mode in Globe style spring actuated control valve.

What is Fail Close control valve ?

Fail Close control valve is a control valve that has have Air to Close Actuator and valve body design and Flow under the valve to assist failure mode in Globe style spring actuated control valve.

What is Fail Indeterminate valve ?

Fail Indeterminate valve is where the Control valve may fail (i.e during loss of air supply) in various positions—open, closed, or in between state i.e termed as fail indeterminate state.

What is Fail Last valve ?

A fail last valve is where the valve stays in its last stage after there was loss of air supply and then eventually (called drift open or drift close) due the forces of fluid it goes in open or close state.
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AsadPassionateEngineer
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I love your explanation, usefully and easy to understand. Thank you for sharing your knowledge

noberttandilo
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Hi Asad, if we consider electric actuated ones (MOV), it depends on the type of plug/disc. For eg in a gate valve MOV i believe it can only be fail last or fail indeterminate. I'm just wondering not quite sure though and never experienced this situation. But MOVs I've usually found FL on p&ids

hareem
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hi
the customer requested air fail Last but siganal failure closed.what isntruments is required and a schematic diagram please

sammashava
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Good explanation Asad.keep it up.
But I do have a question, how the flow necessarily cause the Fail Last position for Globe valve piston to come down or go up.How the horizontal normal flow can lift the vertical piston?
OR the process have to be told to Maintain such flow?

mdnzm
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Mon ami, vous êtes vraiment excellent, merci à vous...

mohsenk
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But sir in case of control valve with piston operated actuator volume tank is also provided by valve vendor right?

rcb
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Good video. Please make video about "needle type control valve".
Thanks.

cck
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