Electric or hydraulic flapper valves are usually equipped with non-metal sealing butterfly valve system to use.

电动或液动插板阀通常与非金属密封蝶阀配系运用。

youdao

Electric or hydraulic flapper valves are usually equipped with non-metal sealing butterfly valve system to use.

电动或液动插板阀通常与非金属密封蝶阀配系运用。

youdao