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止回阀又称为逆流阀、逆止阀、肯压阀、单向阀。这类阀门是靠管路中介本身的流动产生的力而自动开启和关闭的，属于一种自动阀门。止回阀用于管路系统，其主要作用是防止介质倒流以及容器内介质的泄放。止回阀还可用于给其中的压力可能升至超过主系统压力的辅助系统提供补给的管路上。
Check valve is also called the reflux valve,
non-return valve. It's a kind of automatic valve
used in duct system working based on the power
of fluid medium itself. The main function of
this valve is to stop the medium from back off
and bleeding from the container. It's also
suitable for using as the duct of assistance
system for supplying when the pressure is higher
than main system.
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