補償器習慣(guan)上(shang)也叫膨脹(zhang)節，或(huo)(huo)伸縮節。由(you)構成其工(gong)(gong)作(zuo)主(zhu)體的(de)波紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)（一種彈(dan)性元件）和(he)端(duan)管(guan)(guan)(guan)(guan)(guan)、支架、法蘭、導管(guan)(guan)(guan)(guan)(guan)等附件組成。 屬(shu)于(yu)一種補償元件。利用(yong)其工(gong)(gong)作(zuo)主(zhu)體波紋(wen)(wen)管(guan)(guan)(guan)(guan)(guan)的(de)有效伸縮變形，以(yi)吸收管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器等由(you)熱脹(zhang)冷縮等原(yuan)因(yin)而(er)產生的(de)尺(chi)寸變化，或(huo)(huo)補償管(guan)(guan)(guan)(guan)(guan)線、導管(guan)(guan)(guan)(guan)(guan)、容器等的(de)軸向、橫向和(he)角向位移。也可用(yong)于(yu)降噪減(jian)振。在(zai)現代工(gong)(gong)業中(zhong)用(yong)途廣泛。供熱上(shang)，為了防止供熱管(guan)(guan)(guan)(guan)(guan)道升溫(wen)時，由(you)于(yu)熱伸長(chang)或(huo)(huo)溫(wen)度應(ying)力而(er)引(yin)起管(guan)(guan)(guan)(guan)(guan)道變形或(huo)(huo)破壞，需要在(zai)管(guan)(guan)(guan)(guan)(guan)道上(shang)設置(zhi)補償器，以(yi)補償管(guan)(guan)(guan)(guan)(guan)道的(de)熱伸長(chang)，從(cong)而(er)減(jian)小管(guan)(guan)(guan)(guan)(guan)壁(bi)的(de)應(ying)力和(he)作(zuo)用(yong)在(zai)閥件或(huo)(huo)支架結構上(shang)的(de)作(zuo)用(yong)力。