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.

Fatigue performance test of compensator
The non-metallic compensator circulates under the regular design pressure and displacement conditions, and the number of cycles shall not be less than 2 times of the design fatigue life. After the regular number of test cycles, the non-metallic compensator stops the air tightness test, and the leakage shall not be more than 15%. The specification is to ensure the reliability of the non-metallic compensator in the fatigue life,
The cycle rate of positive fatigue test shall not be greater than 25mm per second, and the number of positive fatigue tests shall be twice the number of designed fatigue life
Lack of non-metallic compensator process