What pressure does the pressure reducing valve decrease the oil pressure to in a turbine oil circulating system?

In a turbine oil circulating system, the pressure reducing valve is designed to decrease the oil pressure to a level that ensures effective lubrication while preventing damage to the system components. The correct range of 69-138 kPa aligns with the operational requirements for turbine lubrication systems, which need to maintain a specific oil pressure to ensure proper function and to minimize wear on turbine bearings and other moving components.

This pressure range is typically sufficient to provide adequate flow without causing excessive strain on the system, ensuring optimal performance and reliability. The choice reflects standard practices in power engineering, where maintaining appropriate lubrication pressure is critical for the longevity and efficiency of turbine operations.

Other ranges provided do not suit the operational needs for turbine lubrication, either being too low and potentially risking inadequate lubrication or being too high and posing a risk of component damage from excessive pressure.