What Determines The Pressure At Standby Of A Load Sense System Using An Axial Piston Pump?

In a load sense system utilizing an axial piston pump, the pressure at standby is determined by several factors that influence the hydraulic system’s performance during idle periods. Let’s delve into these key elements to gain a comprehensive understanding.

1. Load Sense Control: The pressure at standby is primarily regulated by the load sense control mechanism. Load sense systems employ a pressure compensator that senses the load pressure and adjusts the pump displacement accordingly. During standby, when there is no demand for flow, the load sense control system modulates the pressure to a predetermined level, commonly known as the standby pressure. This ensures that the system maintains a stable pressure even when no active operations are occurring.
2. Standby Pressure Setting: The specific value of the standby pressure is determined by the system requirements and can be adjusted according to the application. It is typically set at a level sufficient to provide instant response and maintain system stability when the load demands increase. By setting the standby pressure appropriately, the system can optimize energy consumption, reduce wear on components, and ensure quick response when the load is engaged.
3. Pilot Pressure: The pilot pressure, also known as the control pressure, is another crucial factor influencing the pressure at standby. It is generated by the pilot circuit and is responsible for actuating the pressure compensator. The pilot pressure is typically derived from a separate pressure source within the hydraulic system, such as a pilot pump. During standby, the pilot pressure maintains the pressure compensator in a closed position, regulating the standby pressure according to the load sense control mechanism.
4. System Leakage: The presence of system leakage can also affect the pressure at standby. Even during idle periods, there might be some leakage in valves, seals, or connections within the hydraulic system. These leakages create a continuous demand for flow, which can influence the pressure at standby. Minimizing and controlling system leakage through proper maintenance and sealing practices is important to maintain accurate pressure levels and system efficiency during standby.

It is crucial to note that the pressure at standby in a load sense system using an axial piston pump can vary based on the specific system design, pump characteristics, and operating conditions. Understanding these factors and their influence on the pressure levels during idle periods is essential for optimizing the system’s overall performance, energy efficiency, and responsiveness to load demands.