outer cover ring的意思|示意

The device is mainly made up of inner tube, outer tube, piston tube, end cover, retaining ring, hanger, liquid-route element and sealing element.

该装置主体由内管、外管、活塞管、端盖、承压环、吊耳、液路元件和密封元件等组成。

The water heating control valve is composed of a valve casing, a valve outer cover, an inner cover, a pressure spring, a valve core, a positioning device and a sealing ring.

水暖控制阀由阀壳、阀外盖、内盖、压簧、阀芯、定位装置及密封圈构成。