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。
2
The drain character and hydraulic linking are studied by analyzing the property of water-bearing and water-resisting, groundwater flowing and hydrochemistry character in Libi Gorge anticline.
Suitable for drain pumps, fire extinguisher pumps, compressors for refrigerated vehicles and hydraulic pumps used in construction equipment driven by engines.