液动换向阀 meaning in English

hydraulicchange-over valve

Hydraulic fluid power - solenoid actuated pilot operated directional control valve and hydraulic pilot operated directional control valve
液压电液动换向阀和液动换向阀
( 4 ) in order to improve the system and its working function , a hydraulic controlled direction valve is connected in the main oil circuit to control the differential of the piston . then the dimentions of the cylinder and the piston are reduced , improving the working properties
广东工业人学工学顾十学位论义（ 4 ）为进一步改进设计方案，提高其工作性能，在主油路中加一液动换向阀，控制活塞的差动，从而将减小油缸和活塞的尺寸，提高工作性能。