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check valve /ˈtʃɛk ˈvalv/ n

中文：止回阀

中文 · 止回阀Español · válvula de controlFrançais · clapet de retenueDeutsch · Rückschlagventil
Meaning：Valve with a toggle preventing water from backing up into the sump.
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Found in these illustrated scenes（3）

Pedestal sump pump Pressure regulator Fresh oil lubrication with metering pump

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