Ball valve adopts double inclined plane flexible seal ring, efficiently reducing the frication between ball body and valve seat, and operation moment, and ensuring the service life of ball seat.是什么意思_Ball valve adopts double inclined plane flexible seal ring, efficiently reducing the frication between ball body and valve seat, and operation moment, and ensuring the service life of ball seat.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句