Where should an over speed valve be located?

The correct location for an overspeed valve is within 12 inches of the hydraulic jack. This placement is crucial for ensuring that the valve functions effectively in preventing excessive elevator speeds, which can occur during a malfunction or uncontrolled descent. By being close to the hydraulic jack, the overspeed valve can quickly detect and respond to any differences in speed, activating to halt elevator motion and prevent accidents. This proximity allows for rapid pressure release, ensuring the system remains safe and responsive.

Additionally, placing the overspeed valve at this distance enhances the overall safety mechanisms of the elevator system, as it is strategically positioned to monitor and control the hydraulic system directly associated with the elevator's operation. That way, it ensures the safety of passengers and the reliability of the elevator service.