伸縮器也稱伸縮節、膨脹節、補（bǔ）償器（qì），分為：波紋（wén）補償器、套筒補償器、旋轉補償器、方形（xíng）自然（rán）補償器等（děng）幾大類型，其中以波紋補償器較為常用，主要為保障管道（dào）運（yùn）行。
另（lìng）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（fǎ）蘭連接、焊接兩種，直埋式伸縮器（非地溝、設井安裝時）一般采用焊接。管道伸縮器具有良好的綜（zōng）合性能，所（suǒ）以它廣泛用於化工、建築、給水、排水、石油、輕重工業、冷凍、衛生、水暖、消防、電力等基礎工程。
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.