Liner butterfly valve body adopts split combination. Easy to assemble and seal adjustment, the valve work only perfluorinated plastic seat and fluorine lined plastic disc and media contact. Valve body channel inside surface smooth, fluid resistance is small, high cv value, strong flow capacity, moderate torque, fully achieve zero leakage medium, the valve is small, light weight, compact structure, quick switching, beautiful appearance, reasonable technology, reliable performance, light operation, long service life.