A gate or ball type valve can be used or the isolation valve can be installed further upstream.
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。
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。