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Commercial - Hydraulic
HYDRAULIC ELEVATORS
Hydraulic elevators are quite common for low and medium rise buildings (2-8 floors), attain speeds of up to 200 feet/minute (1.0 m/s), and use a hydraulically powered plunger to push the elevator upwards.
On some, the hydraulic piston (plunger) consists of telescoping concentric tubes, allowing a shallow tube to contain the mechanism below the lowest floor. On others, the piston requires a deeper hole below the bottom landing, usually with a PVC casing for protection.
Roped hydraulic elevators use a combination of ropes and hydraulics.
Holeless hydraulic elevators do not require holes to be dug for the hydraulic cylinder. In most designs, the cab is lifted by a pair of hydraulic jacks, one on each side of the elevator.
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