No. That is your job. Please give your examples.Could you give some short examples of how you would use them in active and passive, please.
In this case, I would use "Relieve tension". Relax as a verb is fine with people or muscles, but it does not work very well as an active verb with an inanimate object.Is it OK to say "Relax the spring" (A)?
Or should this be something "Relieve tension on the spring" (B)?
I don't know what exactly you are describing, but you could say something like:"Relax springs of half-couplings"
(I omit "the" for the sake of brevity). I.e. it is the reader (operator/mechanic) who should "relax" the spring.
I cannot figure out how I can make "spring" the subject of the sentence to use "relax" .... comfortably (I mean I don't feel comfortable with option A).
On the other hand, option B looks a bit better.