I am returning to brewing after at least a four year gap. Must say I have become very interested again

My equipment is old (1990 approx) boots beer barrels with the boots stainless steel c02 pressure valve that sits on the barrel cap.
These I see from modern investigation have been replaced by S30 valves which are brass.
My question is, are these ok with chlorine based cleaner/sanitisers or will these affect the brass?
Many thanks,
Dave Whyte
Scottish Craft Brewers