... 直接作用式关压阀：direct-acting reducing valve 先导式减压阀：pilot-operated reducing valve 反向作用式减压阀：reverse acting reducing valve ...
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Pilot-operated reducing valve 先导式液压阀 ; 先导式减压阀 ; 先导式
pedal operated pressure reducing valve 踏板操纵减压阀
solenoid operated pressure reducing valve 电磁操纵降压阀
pilot-operated pressure reducing valve 先导式减压阀
operated reducing valve
操作减压阀
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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