brake tube shutoff cock
闸管关断旋塞
The test cock is on the inlet side of the shutoff valve.
测试旋塞位于关闭阀得进口一侧上。
The shutoff valve with the test cock is to be mounted on the inlet side of the backflow preventer.
带测试旋塞的关闭阀应该安装在防回流阀的进口侧。
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