What is Cv Test? 1) Cv is Flow coefficient or flow capacity rating of valve. (유량 계수 또는 밸브의 유량 등급) 2) The flow coefficient of a valve is a relative measure of its efficiency at allowing fluid flow (밸브의 유량 계수는 유체 흐름을 허용하는 효율의 상대적 측정입니다.) 3) Cv: US unit Kv: metric unit Cv = 1.16 Kv 4) Cv is the volume (in US gallons) of water at 60°F that will flow per minute through a valve with a pressure drop of..