该系列阀门接触流体的部分采用了 PTFE 和 FEP，是一种超耐酸型球阀。外侧使用球墨铸铁或铸钢外壳进行补强。

This series have PEFE or FEP wetted part. This model has excellent acid or corrosice fluid resistant. Outside of the wetted part is guarded by cast iron or stainless steel cover.