In a hydraulic-driven elevator, the car is moved by one or more hydraulic pistons with electrically driven pumps. If the car is directly connected to the piston, this is called a direct drive. In the case of indirect propulsion, the car is connected to the piston via cables or chains. With indirect drives, the piston is always next to the car, with direct drives, the piston can be both next to and under the car. The engine compartment is always located next to the lowest level, except in systems without an engine room, where the drive is installed in the elevator shaft.
Hydraulic elevators reach a speed of up to 1 m/s and can be used for lifting heights of up to 25 m. However, many manufacturers advise a cost comparison with the somewhat more expensive rope lifts from about 20 m.
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Source: bauwion
