I’d like to know more about a hydraulic elevator?

Hydraulic elevators are one of the two types of elevator which are used in the modern world; the other being the rope-system elevator.  Hydraulic elevators work on the simple system of a hydraulic ram. This ram, which incidentally gives the type of lift its name, has a fluid-driven piston mounted inside its outer cylinder.  This cylinder is connected to a fluid pumping system. This incompressible fluid is generally oil but other variations are sometimes found (although these are much rarer).  The fluid is pumped into a pipe leading to the cylinder, and, after various mechanical happenings, the fluid ultimately begins to collect in the cylinder and this begins to push the piston up; this is what moves the elevator car which has the passengers inside.  

To lower the elevator car, the reverse happens and the fluid is slowly leaked out; this causes the car to slowly descend and, when the elevator has reached its destination, the valve is closed and the fluid level stays constant. It really is that simple! That being said, the system is not 100% good and more and more people are pointing out the drawbacks of using the hydraulic system to operate passenger lifts.

Hydraulic Lift Information Guide: