Hydraulic elevators incorporate several critical safety measures to prevent uncontrolled descent in the event of a pipe rupture, which could lead to a dangerous freefall of the elevator car. The primary safety device is a rupture valve, also known as an overspeed valve or a check valve. This valve is installed in the hydraulic line between the hydraulic power unit and the cylinder that lifts the elevator car. The rupture valve is designed to automatically close if it detects an excessive flow of hydraulic fluid, which would occur if a pipe were to rupture. The valve works by sensing the pressure drop across an orifice within the valve body. If the flow rate....
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