Is thermal relief valve need to be bellow type?

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Thread Starter

Parinya

One of thermal relief valve datasheet from our client specified "bellow type". But from my understanding, normally we don't sizing thermal relief valve, just select conventional,3/4x1, letter "D". Do we have to consider back pressure to select the type? Thank you for your help.

(sorry for my poor English, I hope you all can understand)
 
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