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Calculating Stresses in Valve Stem i.e. during operation is the Stem subjected to 50% or more SMYS

Calculating Stresses in Valve Stem i.e. during operation is the Stem subjected to 50% or more SMYS

Calculating Stresses in Valve Stem i.e. during operation is the Stem subjected to 50% or more SMYS

(OP)
Hi Everyone,

This will be my first post on the website, I have looked through previous threads and couldn't seem to find the answer.

Basically I am wanting to know the following:

With regards to valve Stems, if I am trying to work out if the stresses exceed say 60% of SMYS how do I go about working that out. For a pipe its simple as its related to Barlows formula.

I would be grateful if someone could point me in the right direction here with regards to valve stem. I can get the SMYS from the specific material specification but during operation how can I determine if the valve stem is being subjected to say 60%% or more than its SMYS? this would be for Manual and Actuated vales

Thanks in advance.

RE: Calculating Stresses in Valve Stem i.e. during operation is the Stem subjected to 50% or more SMYS

You would calculate the stresses your stem would see, and compare them to an allowable stress which is equal to your SMYS multiplied by your utilization factor of 60%. You would need to look at compressive and tensile loads, as well as buckling and bending deflection on all unguided portions. You should also consider maximum thread stresses as well.

RE: Calculating Stresses in Valve Stem i.e. during operation is the Stem subjected to 50% or more SMYS

(OP)
Thank You SPDL310

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