伸縮器（qì）也稱伸縮（suō）節、膨脹節、補償器，分為：波紋補（bǔ）償器、套筒補償器（qì）、旋轉補償器（qì）、方形自然補償器等幾（jǐ）大類型，其中（zhōng）以波紋補償器較為常（cháng）用，主要為保障管（guǎn）道運行。
另外，管道伸縮器也是伸縮器的一種，管道伸縮器的鏈接主要有法蘭連接、焊接兩種，直埋式伸縮器（非地溝、設井（jǐng）安裝時）一般采用焊接。管道伸縮器具有良好的綜合性能，所以（yǐ）它廣泛用（yòng）於化工、建築、給水、排（pái）水、石油、輕重工業、冷凍、衛生、水（shuǐ）暖、消防、電力等基礎工（gōng）程。
Expansion joints, also known as expansion joints, expansion joints, compensators, divided into: several types of bellows, sleeve compensator, rotating compensator, a square natural compensation, etc., of which the bellows is more commonly used, mainly for the protection of pipelines safe operation.
In addition, the pipe expansion joints is also a kind of expansion joints, pipe expansion joints link the main flange connection, welding, two Buried expansion joints (non-trench, located wells when installed) commonly used welding. Pipe expansion joints with a good overall performance, so it is widely used in chemical, construction, water supply, drainage, oil, light and heavy industrial, refrigeration, sanitation, plumbing, fire, electricity and other infrastructure projects.