Hydraulic Elevator

Unlike traction lifts, hydraulic systems do not use overhead hoisting machinery. Instead, these elevators use the compression of fluids to generate motion. The lift cab is raised by an electric motor that pumps oil into a cylinder to move a piston. The hydraulic lift also includes electric valves to control the release of oil for a comfortable ride.

Hydraulic lifts require a substantial amount of energy to raise the cab, which is why they are not commonly found in tall buildings. These systems also operate at speeds up to 150 ft/min. or less, making them slower than other types of lifts.

Because of these factors, hydraulic lifts are only for buildings up to seven floors tall.