Oil asbestospacking: it forms the basic structure there are two types of torsional system, and the other is knitting.
油浸石棉盘根：它的基本结构形式有两种，一种是扭制，另一种是编结。
2
For example, in order to prevent secondary pollution, even the use of sewage is not Valve asbestospacking and gasket sealing.
例如为了防止二次污染，即使是排污阀也不采用含石棉的密封填料和垫片。
3
Stems shall be of dezincification-resistant silicon bronze ASTM B 371 or low-zinc alloy B 99, non-asbestospacking and malleable or ductile iron handwheel.
阀杆材质是符合美国材料试验协会ASTM B 371标准抗失锌现象的硅青铜，或B 99低锌合金，不含石棉的填料，和可锻或球墨铸铁手轮。