solenoid-actuated directional valve
...5.3.2.2 机动换向阀 Mechanically-actuated Valve 5.3.2.3 电磁换向阀 Solenoid-actuated Directional Valve （4）电磁换向阀的典型结构Typical Structure for Solenoid-actuated Directional Valve ..
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solenoid-actuated directional valve
电磁换向阀
以上为机器翻译结果，长、整句建议使用 人工翻译 。