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。
2
Packing Material: graphite, Teflon, asbestos and special material.
填充料：石墨，聚四氟乙烯，石棉及特殊材质。
3
The replacement of original sealing structure by asbestospacking is easy and practical, can make sealing meet the demands for utilization, is convenient to change and maintain, and is of low cost.