特点 Features：

此类膨胀节有一个万向环，在万向环的周向有两对相互垂直的铰链结构，因此它能吸收任意平面的角位移。通常吸收位移时，应有两个或三个组合使用。

This kind of expansion has a universal ring, and there are two pairs of vertical hinge structures in the circumferential ring. So it can absorb the angular displacement of any plane. Usually when the displacement is absorbed, two or three combinations should be used.