The size of the valves is depend on the type of the valve.
Butterfly valve: from DN40 to DN3000,
Gate valve: from DN15 to DN1200,
Ball valve: from DN15 to DN1200,
Check valve: from DN15 to DN2000 (within different type)
Globe valve: from DN15 to DN300
Valves for steel plant: from DN15 to DN4000