The corrosion resistant pneumatic ball valve is of eccentric metal sealing structure, and the sealing form is metal to metal sealing. The replaceable metal sealing ring is metal sealing, and the stainless steel plate and graphite composite plate sealing ring is metal sealing. In addition to electric drive, hard seal butterfly valves are also driven by manual, worm gear drive, pneumatic, etc. The butterfly plate of the corrosion resistant pneumatic ball valve is installed in the diameter direction of the pipeline. In the cylindrical channel of the hard sealed pneumatic ball valve body, the disc shaped butterfly plate rotates around the axis with a rotation angle of 0~90. When it rotates to 90, the valve is fully open. 　　

2、 Advantages of dual-use fixture for machining external spherical surface and internal pneumatic ball valve: when the link between the connecting rod and the upper and lower rods is removed, it will not affect the continued use of the square tool holder for other processing (such as the turning plane of the valve body, the turning outer circle and inner hole of the valve core); It is easy to disassemble and assemble, and the size of the inner and outer spherical surfaces processed by the same connecting rod can be consistent; Connecting rods composed of series sizes can be used for processing adhesive film cocks of different sizes or other spherical surfaces; The taper shank of tailstock with different taper and size can also be used for lathes of different models and specifications, with a wide range of applications; After removing the tailstock taper handle 7, the valve core can also be drilled and tapped. This tool is simple in structure and manufacture.