The metal bellows has the characteristics of corresponding displacement under the action of pressure, axial force, lateral force or bending moment, and has the properties of pressure resistance, vacuum sealing, corrosion resistance, temperature stability and long service life. Therefore, it is widely used in many industrial fields. Bellows are used as seal isolation elements in valves.
Among the various bellows valves, whether it is a shut-off valve, a throttle valve, a regulating valve or a pressure reducing valve, the bellows is a non-filled sealing isolating element of the valve stem. During the operation of the valve, the bellows is axially displaced and reset together with the valve stem. It also withstands fluid pressure and ensures a seal. Bellows valves offer greater reliability and longevity than packing seal valves.
Therefore, bellows valves are widely used in the nuclear industry, petroleum, chemical, pharmaceutical and aerospace industries. In practical applications, the bellows are often welded with other components such as flanges, nozzles and valve stems to form a bellows assembly. Welding has become an indispensable process in the production of bellows components. With the development of scientific research and production, new requirements have been put forward for corrugated pipe welding tools and equipment.
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