The plumber finds no pipe leaks and suspects a mains leak. 水管工沒有發現漏水的水管,懷疑是主管道漏水。
Bypasses are used in steam service for warming up before the main line is opened and for balancing pressure where the lines are of limited volume. 旁路閥用在蒸汽操作中,用於在主管道開啟前對其進行預熱以及管道數量有限時平衡壓力。