Pipe series: Elbow, tee, cross, movable joint, Bu core, reducer, pipe cap, choke plug, inside the wire, outside the wire, turned-over edge, increaser etc.

管件类： 弯头、三通、四通、活接头、卜芯、大小头、管帽、堵头、内丝、外丝、翻边、异径管。

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By several decades of exploration and practice, the designer has profound acquaintance with stressing mechanism of choke plug that does not rely on shear force to maintain the balance.

经过几十年的探索和实践，设计人员对封堵堵头的受力机理已有了深刻地认识，堵头并不完全是靠基础面的剪摩作用维持平衡。

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