A gate or ball type valve can be used or the isolation valve can be installed further upstream. 可以采用闸阀或球阀，或者可以将隔离阀安装在更上游的地方。
The bypass line shall consist of a meter, a small diameter double check assembly with test cocks and isolation valves. 旁路管线应该由一个水表，配置测试旋塞和隔离阀的一个小直径双止回阀总成构成。
