Hydraulic Elevator

What is Hydraulic Elevator?

Definition of Hydraulic Elevator in Construction
A hydraulic elevator relies on a piston that drops into a jack hole beneath the elevator.

The pumping of hydraulic fluid into casing surrounding the piston, forces the piston to rise up and lift the elevator cab. The use of a piston, to lift the elevator cab, limits the height a hydraulic elevator can service. A hydraulic excavator is limited to the depth of the jack hole and the piston length. Normally a hydraulic elevator will service three or four stories. After that, the use of cables or traction elevators are normally specified. The maintenance of the piston together with the jack hole is required, to assure that the hydraulic pressures are maintained. Replacement of pistons is a common occurrence when renovating older elevators. The removal of the sand that encases the pistons casing is accomplished by the use of vacuum trucks which will vacuum the sand from around the casing in the jack hole. Renovation of elevators is called modernization of the elevator and also in most cases includes the replacement of controls with digital equipment.