| 摘要 |
A hydraulic elevator includes a car engaged with a first hydraulic ram, a counterweight engaged with a second hydraulic ram, and a pump to transfer hydraulic fluid between the hydraulic rams. The counterweight hydraulically balances the car without the requirement of a roped connection between the car and counterweight. A fluid flow system controls the transfer of hydraulic fluid between the hydraulic rams. As a result, there is no tank or reservoir for hydraulic fluid.
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