膨胀节习惯上也叫伸缩节,或波纹管补偿器，是用以利用波纹管补偿器 膨胀节的弹性元件的有效伸缩变形来吸收管线、导管或容器由热胀冷缩等原因而产生的尺寸变化的一种补偿装置，属于一种补偿元件。可对轴向，横向，和角向位移的的吸收，用于在管道、设备及系统的加热位移、机械位移吸收振动、降低噪音等。
　　膨胀节为补偿因温度差与机械振动引起的附加应力，而设置在容器壳体或管道上的一种挠性结构。由于它作为一种能自由伸缩的弹性补偿元件，工作可靠、性能良好、结构紧凑等优点，已广泛应用在化工、冶金、核能等部门。在容器上采用的膨胀节，有多种形式，就波的形状而言，以U形膨胀节应用得最为广泛，其次还有Ω形和C形等。而在管道上采用的膨胀节就结构补偿而言，又有万能式、压力平衡式、铰链式以及万向接头式等。

     Expansion joint habits also called the slip joint, or corrugated tube compensator, is to use corrugating tube compensator expansion joint of elastic component effective telescopic deformation to absorb pipelines, catheters or container consists of heat bilges cold shrink wait for a reason and produce dimensional change of a kind of compensation devices, belongs to a kind of compensation components. But to axial, horizontal, and the absorption of the Angle to the displacement, used in pipeline, equipment and system of heating displacement, mechanical vibration, low noise absorption displacement.
    Expansion joint for compensation for temperature difference and mechanical vibration cause additional stress, and set in the vessel shell or pipe to a flexible structure. Because it as a free adjustable elastic compensation components, reliable work, the performance good, compact, already widely used in chemical industry, metallurgy, nuclear energy and other departments. In the container of the expansion joint, there are various forms, the shape of the wave character, with U shape expansion joint application to the most widely and there are Ω shape and C form. And in the line of the expansion joint structure for compensation, and the universal type, pressure balance type, hinged universal joints and style, etc.
 

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