In a hydraulic elevator, the descent is controlled by which fluid?

In a hydraulic elevator, the descent is controlled by which fluid?

• A. Hydraulic Fluid
• B. Counterweight
• C. Lift Cable
• D. Drum Brake

Answer: (A)

The descent in a hydraulic elevator is controlled by the hydraulic fluid because it serves as the incompressible medium that transmits pressure and backflow through a metering valve. When lowering, the valve throttles the hydraulic fluid as it leaves the cylinder, regulating the rate at which the piston can descend. This flow control, not gravity alone, determines how quickly and smoothly you descend. The other options aren’t part of the hydraulic descent mechanism: a counterweight is used in some non-hydraulic systems to balance load, while lift cables and drum brakes belong to cable-driven or traction elevators, not hydro-pneumatic ones. So the fluid doing the control is the hydraulic fluid.

The descent in a hydraulic elevator is controlled by the hydraulic fluid because it serves as the incompressible medium that transmits pressure and backflow through a metering valve. When lowering, the valve throttles the hydraulic fluid as it leaves the cylinder, regulating the rate at which the piston can descend. This flow control, not gravity alone, determines how quickly and smoothly you descend. The other options aren’t part of the hydraulic descent mechanism: a counterweight is used in some non-hydraulic systems to balance load, while lift cables and drum brakes belong to cable-driven or traction elevators, not hydro-pneumatic ones. So the fluid doing the control is the hydraulic fluid.