A hydraulic elevator is a type of vertical lift that uses hydraulic fluids to move the elevator car up and down. In a hydraulic elevator, a pump forces oil into a cylinder, which pushes a piston up. The piston is connected to the elevator car, so when the piston moves up, the elevator car moves up, and when the pressure is released the elevator car lowers.
A traction elevator is a type of elevator that uses a system of ropes and pulleys to move the elevator car up and down. Traction elevators are the most common type of elevator in use today, and they are typically used in high-rise buildings. In traction elevators, the elevator sheaves are the pulleys that hold the elevator cables and are responsible for the elevator's traction and lifting motion, as well as where it gets its name.
