What does the fatigue rating of a hydraulic pump indicate?

The fatigue rating of a hydraulic pump is an indication of the maximum pressure that the pump can sustain over time without sustaining damage from continuous operation. This rating is critical, as it determines the pump's reliability and longevity, particularly under varying load conditions.

When a hydraulic pump operates, it experiences cyclical stress due to the constant changes in pressure as the pump cycles through its operation. The fatigue rating helps to predict how long the pump can operate before internal wear, material fatigue, or failure may occur. Understanding this rating allows engineers and technicians to select the appropriate pump for specific applications, ensuring it remains reliable throughout its intended service life.

In contrast to other options, which may refer to maximum pressures, ongoing operational pressures, or pressure limits for short tests (like blocking the outlet), the fatigue rating specifically addresses sustained operations and the inherent limitations related to the long-term integrity of the pump under continuous pressure conditions.