Isolation valve in Fire Main System; Location, Uses, Requirements

𝕡𝐫ｏ𝕄ｏ𝔰𝓶 💋

sir good day.
is there two number of isolating valve for fire main system? one for E/R and one for deck?

Thank you, your pronunciation is good i understood.

Well explained bsir can tou provided us the odf you are using in vdo

What I undertand in this video is that the isolating valve is used to shut water from travelling except the machinery spaces.