The ACV 513-6 pump control valve starts in an open position during pump start-up, purging the deep well of air and debris to atmosphere.是什么意思_The ACV 513-6 pump control valve starts in an open position during pump start-up, purging the deep well of air and debris to atmosphere.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句