The utility model relates to a set of water supply facilities which is provided with a fault feedback device for the internal drainage of a check valve.
本实用新型涉及一种加装止回阀内泄故障反馈装置的成套给水设备。
The utility model relates to a set of water supply facilities which is provided with a fault feedback device for the internal drainage of a check valve.
本实用新型涉及一种加装止回阀内泄故障反馈装置的成套给水设备。
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