凸条 meaning in English

raised line
sand grip

Install the sleeve into the bonnet and align with the diaphragm and the embossed strip on the compressor and the slots in the bonnet
将套筒组装入上盖，必须对准膜片及压板上的凸条与上盖里的沟槽。
Valve assembling : lock the screw on the diaphragm into the compressor for aligning with the embossed strip and indicating embossed strip of the compressor
组装阀门：将膜片的上面螺丝锁入压板里，并且对正膜片的凸条与压片的指示凸条。