Manual valve circuit;

手动阀换向回路；

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The balance valve circuit is to support the weight of platen and plunger design.

回路中的平衡阀是为支撑压板及柱塞的重量而设计的。

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Now many frozen type dryer are equipped with heat flow bypass valve or needed to control circuit.

现在许多冷冻式干燥器都配备有热气流旁通阀或所需要的控制电路。

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What he did not foresee was the development of the transistor and later the integrated circuit, which mean satellites are far smaller than the objects he sketched out, which would have used valve technology and needed regular maintenance.

BBC: NEWS | Technology | Arthur C Clarke: predictions