Shell structure: the valve body of the fixed ball valve can be designed into three types, namely, cast structure, forged structure and all welded structure, according to the user's needs and actual working conditions. The ball valve with all welded structure is mainly suitable for underground use.

What are the classifications of stainless steel pneumatic butterfly valves?
From the perspective of product planning, the metal corrugated pipe has two kinds of materials: strip and pipe, which can form annular corrugated pipe and spiral corrugated pipe.
The annular corrugated pipe is a pipe with special shapes whose outer edge of a number of annular diaphragms is tangent to a number of concave centripetal semicircular rings, and the inner edge is tangent to a number of concave vest semicircular rings. Its blank is mainly pipe material. This type of corrugated pipe has the following characteristics: large flexibility, good elasticity, simple manufacturing and small rigidity. It is suitable for manufacturing pneumatic butterfly valves with large and medium diameters that bear normal working pressure and have high demand for flexibility.
Spiral corrugated pipe is a pipe with special shapes whose outer edge of the spring wound membrane of a certain length is tangent to the spring wound concave centripetal semicircular ring, and the inner edge is tangent to the spring wound concave vest semicircular ring. This type of bellows has the characteristics of high strength, high rigidity, simple manufacturing, etc., and is suitable for making pneumatic butterfly valves with high and medium pressure, medium and small diameters that have common flexible requirements and high strength requirements.