Test ports shall have internal check valve and be equipped with caps.
测试端口应该内置止回阀并配置阀盖。
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。
Check if the control valve has internal leaking.
检查控制阀是否有内漏。
Check if the control valve has internal leaking.
检查控制阀是否有内漏。
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