阀杆应该是400系列不锈钢，不能将阀杆暴露在蝶板紧固件上。

Stem should be 400 series stainless steel, can not stem exposed to the butterfly plate fasteners.

youdao

阀杆应该是400系列不锈钢，不能将阀杆暴露在蝶板紧固件上。

Stem should be 400 series stainless steel, can not stem exposed to the butterfly plate fasteners.

youdao