valve operating piston
... valve type piston 阀式活塞 release valve lower piston 缓解阀下活塞 valve operating piston 阀动活塞 ...
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继动活塞阀 relay piston valve
液压继动阀活塞 hydraulic relay valve piston
液压继动阀活塞皮碗 hydraulic relay valve piston cup
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模块上移
模块下移
不移动