What are the functions of the various components of lubricating oil in large-scale units?
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What is the difference between pressure control valves and accumulators in large-scale units? When are they activated respectively?
Pressure control valve: Controls pressure; Accumulator: Compensates for oil pressure fluctuations
Pressure control valve assemblies generally consist of two sets, namely primary and secondary control valve assemblies, which are used primarily to regulate the pressure of lubricating oil reaching various areas so that it meets the required pressure levels in each area； The accumulator serves the same purpose as the emergency oil pump and the high-level oil tank: to ensure that the system has sufficient oil for a short period of time in emergency situations, thereby preventing damage to the equipment due to friction without oil.
What’s the difference between pressure control and oil pressure fluctuations? Aren’t they the same thing? This is my doubt
And from the PID diagram, I can see that both the accumulator and the pressure control valve are connected right after the filter, right next to it
What was said on the 3rd floor regarding the control valve assembly is correct; the accumulator’s role in the oil system is primarily to stabilize pressure and absorb fluctuations in the oil flow, while the high-level oil tank ensures an adequate supply of lubricating oil when the unit is running at idle.
Does the accumulator affect the oil circuit? Does the pressure control valve affect the lubricated areas?
They are all within the oil system, but they serve different purposes
There should be a control system to achieve different functions, right?
Pressure control is achieved through the use of pneumatic control valves for regulation； The accumulator is automatically regulated by the pressure of nitrogen inside it.
What controls them is oil pressure; fluctuations in this pressure are compensated for by accumulators. There is usually an alarm when the oil pressure drops, and at that point the backup pump of the oil system is activated. If the pressure drops even further to the interlock level, the unit’s safety system will send a signal to shut down the unit due to low oil pressure. In such an emergency shutdown, since there is no oil pressure in the oil system, check valves are present in the oil supply lines, allowing the high-level oil tank to supply oil to the various bearing lubrication points, thereby maintaining operation in a dormant state.