to complement btrueblood as well,
Indeed you (Victarion) should check material compatibility of valves with the medium. And thoroughly, not just the seals.
For example: spindle, is it 17-4PH? there is a grown hesitance of not using this material for medium with H2S content due to potential sulfide stress cracking,
What is the base material of the plug, hard facing, etc.? Check its compatibility with the medium. Suggest to involve metallurgist for this assessment.
Leak? Yes, standard pressure testing should be ok.
Is it good enough? its for you and hopefully your line manager and other inspector to judge. I assume you will only do with water, static pressure and ambient temperature. Only a handful of facilities in the world which can perform simulated flow pressure testing.
In my opinion, Emerson 'Control valve Handbook' is by far the most accessible and clear book which address general yet in depth information for control and sizing information (mostly for Emerson related product). Is it sufficient for non-Emerson (sizing) engineer to judge the compatibility of x valve against y medium characteristic? No. Emerson have more in depth flow and sizing software.
First hand experience, I've seen so many incidents where flow characteristic were altered (assessed by simple calculation should be ok), or its location shifted to other places. And this 'management of change' triggering either premature worn on material and/or flow induce vibration on piping. Then either gland leakage or valve become stuck.
I never see even experienced engineers do this kind of assessment solo. It is always have to be re-checked by several counter part, due too potential overlooking something.
regards,
MR
All valves will last for years, except the ones that were poorly manufactured; are still wrongly operated and or were wrongly selected