Due to the non availability of pressure reducing valves from 40 bar to 10 bar , I will install two valves in series the first 40-16 bar and the second 16-10 bar , Is there are any limits for the distance between both valves ?The valves are of 2" size , to be connected to 2" steel line to take water from a 16" discharge line of booster pump that discharge water at 40 bar . the 2" steel water line is to feed the operation building at the booster station and other water hydrants I suggest that you need a severe service valve with velocity control and you will achieve the pressure reduction in one valves.Check out Mitech, CCI, Copes Vulcan and Flowserve (Valtek) who all manufacture such a valve. A single-stage anticavitation cage control valve should <> any cavitation and prevent damage. "itdepends" points out correctly that metal-seated valves leak when closed, so your system needs (1) to be using water continuously at greater than the leak rate,(2) or, to have an additional positive isolation valve, or at least the soft-seat option since I infer that this is cool water (3) or, a PRV downstream of the control valve.

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