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Hydraulic bellows

The hydraulic bellows can increase the number of layers to improve the pressure resistance and good pressure resistance. Multi wave one-time forming or single wave continuous forming, short production cycle, low price, large rigidity, small allowable displacement (single wave displacement is 15% - 20% of wave distance). The raw material is seamless tube blank or seamless tube blank. The production process of extremely thin-walled seamless tube is complex. The welded tube has high requirements for welding equipment. The domestic production process of small diameter seamless tube is not mature.

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The hydraulic bellows are highly standardized and serialized. Users can select the type according to the samples of professional manufacturers. Welded bellows are generally single or double-layer, with limited pressure resistance. The number of welds is directly proportional to the wave number, the production cycle is long, the price is high, the rigidity is small, and the allowable displacement is large (the compression ratio is 40% - 60%). The raw material is plate or strip, which is easy to obtain, and the materials with poor plasticity and good elasticity can be selected. The degree of standardization and serialization is poor.


The working condition of bellows valve is more and more severe, which puts forward higher requirements for bellows material. In the selection process of bellows with special materials for valves, appropriate materials and bellows forming methods shall be selected according to the specific working conditions of valves. Because of the characteristics of high pressure resistance, high temperature resistance, corrosion resistance and long service life, the bellows made of special materials for valves will become the development trend of bellows for valves.


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