Brand new patented product, the flow rate of twin fast-flow ball valve is 40% higher than butterfly valve, the bottom of valve body is cut flat, the residual goods are reduced by 90%, especially suitable for crystallization goods. The main sealing plate is two-piece type, easy to replace the sealing ring. Special casting molding, the overall length is same with butterfly valve, located in the tank frame, comply with IMDG specifications, with improval safety performance. The opening angle of the inner seal pressing plate increases by 15%, and the flow rate is larger. External spring for easy cleaning and replacement. Optional symmetrical double spring for higher pressure.