1.It does not require any high requirements and high cost machine room in the upper part of the well. It can be as high as the roof.
2.High utilization rate of the well:Counterweight is nof required for hydraulic elevator, It erhances the utilization rate of the well area.
3.The vertical loads such as car dead-weight load of hydraulic elevator etc, act upon the well ground through the hydraulic cylinder. it has low requirements to wards the building performance of the well wall & top.