Fluid design, in the cover of the battery set a one-way valve.

液设计，在电池的上盖中设置了一个单向的安全阀。

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Valve regulated lead acid (VRLA) battery is applied extensively in substation DC systems as its less maintenance.

阀控式铅酸蓄电池简称VRLA电池，维护量小，在变电站直流系统广泛应用。

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Precipitation of, at the same time, USES the special relief valve to keep the battery internal pressure.

的析出，同时，采用特制安全阀使电池保持一定的内压。

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Studies of the blowout preventer's two control pods suggest that a flattish battery and a dodgy valve meant that neither was in a fit state to close off the well automatically when they should have, which BP takes as evidence of poor maintenance by Transocean.

ECONOMIST: BP casts the blame for the Gulf oil spill widely