Drain line: the hydraulic components leaked oil into the return pipe or tank.
泄油管路：将液压元件泄露的油液导入回油管或油箱。
A method to inspect the leakage of return water of heating water in oil tank is introduced.
介绍了一种储油罐加热盘管泄漏锅炉回水检测技术，给出了其在实际应用中的特定工艺规程。
Open system is the pump suction from the tank, the oil through a variety of control valves, the drive hydraulic actuators, valve oil return back for another fuel tank.
开式系统是指液压泵从油箱吸油，油经各种控制阀后，驱动液压执行元件，回油再经过换向阀回油箱。
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