旋塞阀的优点在于结构简单，占用空间小，已安装，启闭只需旋转90度。

Xuan Sefa has the advantage of being simple, small space, has been installed, rotary hoist only 90 degrees.

youdao

旋塞阀的优点在于结构简单，占用空间小，已安装，启闭只需旋转90度。

Xuan Sefa has the advantage of being simple, small space, has been installed, rotary hoist only 90 degrees.

youdao