V type ball valve is one kind of ball valves whose closing member is its type “V”open mouth on the hemisphere which has sharp cutting edge. During the gyrating process of the ball, the closing members can scrub each other and strongly cut the fluid. Its type “V”open mouth and seat port will form a sector region to change the cross-sectional area of the port and accurately adjust the fluid. V type ball valve is a kind of rotary angle control valve. Its sealing is same as the common ball valve, which equip it with control and on-off two functions. V type ball valve, together with the supporting pneumatic or electric actuator, is widely used in the self-control system of industry.